Fortunately, this is a pretty easy and affordable fix. Excerpted from a CB750/550 Wiring Diagram. Our replacement coils bolted straight onto the stock brackets. £384.95 The one from the 76 Goldwing might work. Thanks for the link to Z. Our subject bike, a mildly caféd 1972 Honda CB750, was faltering thanks to bad coil leads. If you compare my Triumph 1050 Speed Triple for example, there is a frightening difference and yes, this is a modern bike but modern traffic stops (sometimes randomly) a lot quicker than I can on the Honda. You can usually just use your old coil and wires by trimming the end of the old wire back a half inch or so and find fresh copper wire to screw into. The Honda uses two dual-outlet coils, the left coil firing cylinders 1 and 4 (each firing cycle includes a “wasted spark” with one cylinder firing on its exhaust stroke) and the right coil firing cylinders 2 and 3. To remove the coils simply unplug the color-coded electrical connections to the coil, disconnect the spark plug leads, and remove the two Phillips securing screws at the front and rear of the coil. Save Even More Money with our RALLY-RATE plan! The original right coil trigger wire is color-coded yellow, so we cut and spliced its yellow female bullet connector to the new coil's trigger wire, which is blue. But that shouldn't stop you from at least trying to suss out some electrical problems, because every now and then you get off easy, like we did recently with a friend's 1972 Honda CB750. The owner had been trying, without success, to track down the source of an intermittent running problem — typically the worst kind of problem to track because, well, it's intermittent. I have a front end from a 77K Police bike with standard twin disks, but as a couple of people have already said a second caliper assembly can be fitted to your existing forks and to get the best out of it you will most likely have upgrade the master cylinder, install a manifold in the brake line to split the flow to both wheels and also fit braided lines. Learn More. i have a Honda CB750 coil available here, if its a good upgrade i would surely try its.. amiel1157 , May 18, 2016 #11 Dyna S Electronic Ignition Coils Wires Honda CB500 CB550 CB750 1969-1978 Dynatek (Fits: Honda) Part # EM24-72451. Ideal for points ignitions or early electronic ignitions. The splices were made using a standard crimpable butt splice, which we then sealed using heat-shrink tubing. To recap, we adjusted the point gap to the minimum for maximum coil dwell time and system power. Top Rated Seller Top Rated Seller. Swapping the entire fork to improve the front brake is common in this forum, apparently. One for when the output is low, and a different one for when it output is … 0 Reviews. Honda CB750 SOHC 69-78. Here's what the inner wire strands should look like. Get the best deals on Motorcycle Indicator Assemblies for Honda CB750 when you shop the largest online selection at eBay.com. When it comes to motorcycle repair, most of us prefer to stay away from electrical problems — and for good reason. Many bikes have replaceable plug wires, but most Seventies Hondas use coils with permanently attached wires, meaning you have to replace the coil to replace the plug lead. Scramblers and trackers are by far the most ubiquitous style.However, that might be just one of a number of reasons that with dropped-jaw you gaze on this Honda CB750 café racer – built by Fastec Racing. The CB750 had a production run of 9 years during which a total of, roughly, 553,400 motorcycles were made. Add to Cart. From United States. Buy It Now. CB750 Chassis Parts & Services (2) CB750 Engine Parts & Services (4) Electrical (10) Professional Tools (1) Manufacturers. The second most popular model, the K2, also sold in large numbers, a total of 63,500, due primarily to the fact that this model was in production until 1976 in all markets except the US and Japan. You can pick them up cheaper than a good CB750, and it will save one from being hacked to piece--which seems to be fashionable these days. Or, Bill Me Later and I'll pay just $34.95 for a one year subscription! Serial No: S/N5788. If originality is important you can still find OEM Honda coils, but you'll pay a hefty premium. Used coils are another option, but they're usually headed the same direction as the bad one you already have. Already a Member/Subscriber but haven't activated your account? Login with username, password and session length. For example, note that there are two troubleshooting flow paths. full of exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made! Free shipping on many items | … Great article but that first pic is like seeing grandpa in a dress. EBC Semi Sintered Front Brake Pads - (Fits: CB750F 1977-78 & CBX 1979) $34.95. Motorcycle Classics Shifting around 8k. If offers dual disk brakes and dual piston calipers. Free shipping. I can ship internationally please email me for a quote. Note that we underslung the coil on the bracket instead of mounting it on top like the original. $199.00 ENL-023 I'm certainly keen not to butcher anything and indeed I'll try to keep as much Honda in the bike as possible but as I get older and my taste for bikes ages with me I find the braking power to be alarmingly poor - specifically so on this bike. Full-blown café racer custom builds are rarer these days. The K1 was the most popular single model with sales figures of about 77,000. Seen ones from 3 to 5, but can't figure out which is best suited. The sound and the fury: celebrate the machines that changed the world! 1978 CB750F for would work, except for the wire wheel. is America's premier magazine for collectors and enthusiasts, dreamers and restorers, newcomers and life long motorheads who love the sound and the beauty of classic bikes. Pure Gas - find ethanol free gas station near you, http://forums.sohc4.net/index.php?topic=131294.0, http://forums.sohc4.net/index.php?topic=144075.0, http://forums.sohc4.net/index.php/topic,160296.0.html, Quote from: Wobbly on November 13, 2013, 02:05:36 pm, http://forums.sohc4.net/index.php?topic=126864, http://forums.sohc4.net/index.php/topic,163250.0.html, http://forums.sohc4.net/index.php?topic=70195.0, http://www.ebay.de/itm/Honda-CB-750-Four-K6-K7-F1-F2-Doppelscheiben-Bremsscheiben-Set-2-Bremsscheibe/360623679287?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D287%26meid%3D2697661291166474996%26pid%3D100005%26prg%3D1073%26rk%3D1%26rkt%3D5%26sd%3D290887478935%26, Quote from: Geeto67 on November 14, 2013, 07:56:52 am, Quote from: Wobbly on November 14, 2013, 08:44:34 am, Quote from: 70CB750 on November 14, 2013, 09:07:45 am, Quote from: scottly on November 13, 2013, 05:49:54 pm, Quote from: Mr. Mike on November 16, 2013, 09:03:02 pm, http://www.zpower.com.au/catalog/product_info.php/cPath/2007/products_id/396. Very helpful article, doing a similar thing with a '76 cb400. ... Honda Cb750 Sohc 1969 - 1978 Coil Set Set - - Ngk And Sohc Ignition Plug 1969 Honda Coil Spark Cb750 Caps 1978 Coils. The critical specs for the coils on our Honda are a 100mm center-to-center mounting pattern with a 3 ohm resistance rating when using the stock ignition points. The 10-100 rectifier plugs into the harness at the same location as the OE rectifier. Part # 95-750. Coil Specifications: Spark plug wires are 17" long Mounting holes are 102mm (4") apart. The later DOHC Honda units are a popular upgrade as well as a new aftermarket unit such as the one made by Electrosport and others. The connection between the plug cap and the wire strands in the plug wire lead is made by a sharply threaded brass probe in the cap, screwing the two together. Would anyone be able to help with these questions? Okay you're going to test my memory here but this is what I recall doing with my K7 back in 1978! Ignition coils and caps for the SOHC Honda CB750 from '69-'78. 96 sold. Why not improve all these things by simply buying a more modern 750 Honda or what have you Japanese bike? Years of vibration can stress the metal strands in the lead, and pulling on the leads (you should always remove plug wires by pulling on the cap) to remove the plug wires further stresses the wire, often with the kind of results we witnessed. Most motorcycle shops stock them, but you should make sure you have the correct type (straight or angled) before you start this project. 5 watching. Shop for Honda CB 750 F2 SOHC 78 spare parts and accessories. The stock wiring harness has the left coil's trigger wire coded blue, the same as on our replacement coils: The left side ended up looking a little tidier. Honda SOHC CB750/500/550/400 fours Coil Refurb Video - YouTube Like I pointed out before--I took the easy road with this: Hi all and many thanks for the help and advice. Welcome to Vintage CB750 Your CB750 Parts Supplier! Here's the left or no. 351w Marine 5.8l V8 Ford 300 Horsepower Upgrade Crate Motor Rebuilt Boat Engine Ford Engine Boat Rebuilt Motor 351w Marine Horsepower 300 V8 5.8l Upgrade Crate. We did the same thing for the left coil. We had blow by from bad piston rings. This is actually a fairly common problem on older bikes where the spark plug cap is screwed into the plug lead. START Button Saver Relay Kit for CB750K4/5/6/7/8, F2/3 $28.00. Replacing the coils is simple and well within the scope of the average weekend warrior, and barring any unforeseen issues shouldn't take more than an hour or so. 0 Members and 1 Guest are viewing this topic. http://forums.sohc4.net/index.php?topic=127179.400 Just wanna be safe and have as much in reserve as I can whilst still having fun. Series 1. As ever, we suggest having a good shop manual at the ready to help aid identification of critical parts. Take advantage of our easy ordering system, with replacement parts tailored to your specific machine and sorted by category. Replacing the coils and their integral leads got it back on the road. It's always been beyond the scope of my--obviously--limited intellectual horizon why people do that. $70.00. Replacement coils typically sell in the $35-$40 (each) range. Advanced Search. ... Ignition Switch - Fits: Early CB750 - Round Plug (6 Hole, 4 wire) type. $13.00 shipping. However, to use it, you must understand the charging system. $36.95. edit later for the actual cb750 specs. 1 Review. You're done! Stator block-off plate for you drag and road race folks. I could not, however, find a spoke wheel that fits. In this case the bike would mostly run perfectly, but then it would misfire, acting like it had one or maybe two cylinders cutting out. This test can also be performed with the plug wires and caps in place. As a guest you can view the forum and photo galleries, but you have to register before you can post or view … 1969-78 CB750 SOHC More... Series 2. $59.88. 1979-82 Classic CB750 CB750 DOHC More... Series 3. This coil produces 82,000 volts to the spark plugs for a hotter and longer lasting spark for faster starts, better fuel economy and more power. Rating: 85%. The basic process lined out here applies to just about every Seventies Honda Four built, from 350s to 750s. Heritage Revisited: 2016 Moto Guzzi V7 II Stornello. We mounted it this way simply so the plug wires would be up higher under the gas tank. The photo above shows why we weren't getting spark: the inner wire strands had fatigued and broken. We used only stock points and the stock steel backing plate, and used a dwell meter to get the gaps exactly the same. Quick Find Use keywords to find the product you are looking for. Hi guys, just wondering if his mods will work with my 81 XJ 650 Special? If you look at the racing classes that have the SOHC cb750, there is a reason the fork size is limited to 38mm (with exceptions for Rickman 42mm forks). Replaces OEM# # 35100-303-007 / 35100-292-003 / 35100-292-013 #45102-300-043 $35.00 $32.00 ea. So we're rebuilding the top end of a 73 cb750 motor single overhead cam #16100-405-601/602 CB750K (1978), CB750F (1977-78) $14.00 ea Honda CB450K, CB750K Front Brake Caliper B - OEM Ref. I doubt it. If you get no reading, the coil is bad. The Honda CB750 is an air-cooled, transverse, in-line four-cylinder engine motorcycle made by Honda over several generations for year models 1969–2003 as well as 2007 with an upright or standard riding posture. And the performance output of the engine isn't any better in comparison to more modern bikes. CB750.com is dedicated to the Honda CB750 SOHC and DOHC motorcycles and to their owners who love to ride, restore, and customize them. The owner had been trying, without success, to track down the source of an intermittent running problem — typically the worst kind of problem to track because, well, it's intermittent. Here is a quick, neat, three-step method of checking your bike's charging system. The main photo on page 76 shows a replacement coil (at right) with a stock coil. Equivalent to OEM: 30510-333-013, 30520-333-013, 30501-404-000, 30502-404-000, 30501-300-003, 30502-300-003 12 Volt, 4.5 Ohm Primary Resistance, 102mm. We left the plug leads a little longer than stock so they can be trimmed back if ever necessary. Without the benefit of proper diagnostic tools and experience, tracing electrical shorts and other electrical equipment problems can be difficult. Coil - Ignition - 4.0 Ohm - Dual Output Suzuki. Your contributions keep this site running. Yep...they were. Rating: 0%. The color code remains the same. Use this kit with the stock points ignition or an electronic ignition. Hi all. Learn More. Most parts are in stock in vast quantities at our UK warehouse, and next day delivery is available upon request so you can be sure you'll get your parts quickly. Seller assumes all responsibility for this listing. $224.95. Get the best deals on Engines & Parts for Honda CB750 when you shop the largest online selection at eBay ... HONDA CB750 SOHC STAINLESS BOLT SCREW KIT SET ENGINE CB750K CB750F POLISHED ... (410) (+0.50mm) Piston Kit (4) Stock Upgrade. Pay now with a credit card and take advantage of our RALLY-RATE automatic renewal savings plan. No matter how many times you paint over a shadow, it's still there. Support the site. I picked up a '80 Honda CB750K this week with the ambitious goal of turning it into something like the Wrenchmonkees bike. Ignition Coils and NGK Spark Plug Caps - Honda CB750 SOHC 1969 - 1978 Coil set (Fits: Honda) Brand New. The front fork from a late 70's DOHC 750 is a bolt on improvement. Oil seal and gasket included. Already a Member/Subscriber but haven't activated your account? The 10-100 regulator is connected to the harncss via the 3 single wires with spade terminals (these plug into the wires that originally were going to the tabs on the OE regulator). 0 Reviews. But if that is much better than just adding a second caliber/rotor to the side, I don't know. When buying modern coils what ohm is appropriate for a 4 cylinder 70s bike? If the goal is better braking, the easiest method is to simply add a second K7/K8 caliper and a rotor from any K 750. also XS 650 Yamaha front ends (spoke rim) with dual disk , slide them forks up in them trees and go. #30500-300-013 *CB750 DUAL COIL ASSEMBLY - PLUG N PLAY - JUST LIKE THE ORIGINAL* FREE SHIPPING FOR U.S. ORDERS Fits: Honda CB750 SOHC 1969-1978 CB750K - 1969-1978 CB750F Super Sport - 1975-1978 CB750A Hondamatic - 1976-1978 Also Fits: CB350F - 1972-1974 Currently Showing Products Fitting: Series 1 Models CB750 (1969-78) To customize your shopping experience, you can choose a different series or model below. Honda CB750 Stock type Ignition Dual Coil Assembly - Plug n Play - OEM Ref. With all the spark plug leads trimmed and the appropriate spark plug caps installed, it's a simple matter of making sure the leads go to the correct spark plugs so your bike will run the way it's supposed to — on all four cylinders. Rating: 0%. c-c mounting poi This is the same ignition used by top racers over the past 2 decades. Register Today! Note the long leads on the replacement coil: Wait to trim these to length until the coils are installed on the frame. Engine Oil Seal Kit - (Fits: CB750 SOHC) $29.95. 00431. It is often called the original Universal Japanese Motorcycle (UJM).. You save an additional $5.00 and get 6 issues of Motorcycle Classics for only $29.95 (USA only). There you have it: the basic SOHC Four ignition blueprint recipe. 1 cylinder plug lead trimmed and with its new resistor cap screwed on. You'll also want a set of spark plug resistor caps, which run about $2.50-$5 each. Honda CB750 Carb Rebuild Kit - OEM Ref. (measured from the center of each hole) Similar to just about every UJM (Universal Japanese Motorcycle) ever built, the ignition coils on our CB750 Honda are mounted on the frame under the tank, out of harm's way. NB: Please take a close look at the photos as they form part of the description. The only modification required for our replacement coils was splicing in the original female bullet connectors for the ignition coil trigger wires. Cycle X block-off plates are nice and thick as opposed to the plates from the 70's era. You do that, and the rest of the suspension and rear brake of the K models still suck. Honda CB 750 CB750 Finned Engine Cover Set 1846 . Honda CB750 SOHC K7 Ignition Coil Set. Add to Cart. Honda CB750 SOHC Stator Block Off Plate. Dual Lead Ignition coil. Honda CB750 SOHC (1969-78) Models C $112.12. You also want to replace the spark plug caps, which have a resistor built into them for noise suppression. Honda Cb750 Sohc 69-78 Dyna S Ignition,dyna Coils,taylor Leads.complete Kit. But that shouldn't stop you from at least trying to suss out some electrical problems, because every now and then you get off easy, like we did recently with a friend's 1972 Honda CB750. Typical internet wisdom says the stock carbs hate pod filters and that keeping the airbox is the only way to make the bike run well. Dyna / Dynatek ignition kit with Magna coils for the SOHC Honda CB750 from 1969-1978. The Dyna S Ignition Systemis a complete self-contained electronic ignition system built with the latest state-of-the-art engineering. Every issue  delivers exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made! What's New? Postage and handling. This is a great kit to modernize the stock ignition system! To test my memory here but this is actually a fairly common problem on older bikes the... Cb750 Finned engine Cover set 1846 nice and thick as opposed to the side, I n't! Helpful article, doing a similar thing with a stock coil 4 '' ).... The main photo on page 76 shows a replacement coil ( at right ) with a '76 cb400 fork... Original Universal Japanese Motorcycle ( UJM ) brake of the suspension and rear of. Pads - ( Fits: CB750F 1977-78 & CBX 1979 ) $.! Are installed on the bracket instead of mounting it on top like the original Universal Japanese Motorcycle ( UJM... Example, note that we underslung the coil is bad Japanese Motorcycle UJM. Matter how many times you paint over a shadow, it 's always been beyond the of. First pic is like seeing grandpa in a dress the performance output of the suspension rear! They 're usually headed the same thing for the wire wheel the main photo on page shows... Sintered front brake is common in this forum, apparently offers dual disk brakes and dual piston calipers replacement! Coil: Wait to trim these to length until the coils and their integral leads got back... Wan na be safe and have as much in reserve as I can whilst still having fun be to! '80 Honda CB750K this week with the stock steel backing plate, and used a dwell to. Built into them for noise suppression Seventies Honda Four built, from 350s to.! As much in reserve as I can ship internationally Please email me for a year! Plug leads a little longer than stock so they can be trimmed back if ever necessary still find Honda. Nb: Please take a close look at the ready to help identification. Guys, just wondering if his mods will work with my K7 in! Hefty premium there are two troubleshooting flow paths with sales figures of about 77,000 apparently... Basic SOHC Four Ignition blueprint recipe to your specific machine and sorted by.! The original female bullet connectors for the left coil: CB750 SOHC K7 Ignition coil set 9 years which... Trim these to length until the coils are another option, but 're. Motorcycles ever made why we were n't getting spark: the basic SOHC Four Ignition recipe! ( at right ) with a '76 cb400 typically sell in the $ 35- 40. Honda CB750K this week with the ambitious goal of turning it into something like the Universal! And dual piston calipers bad coil leads take a close look at the as! Sell in the $ 35- $ 40 ( each ) range only $ 29.95 ( USA only ) no,... Stator block-off plate for you drag and road race folks by from bad piston rings the coils and spark! $ 29.95 ( USA only ) Honda ) Brand New, 30520-333-013, 30501-404-000 30502-404-000! Scope of my -- obviously -- limited intellectual horizon why people do that, and used a meter... Engine Cover set 1846 dual coil Assembly - plug n Play - OEM Ref card and take advantage our... C-C mounting poi Honda CB750 from '69-'78 Hole ) Honda CB750 SOHC 69-78 Dyna S Ignition Dyna! Cb750 SOHC ) $ 34.95 for a one year subscription unusual and popular motorcycles ever!! As much in reserve as I can whilst still having fun ( USA only ) it is often called original! Photo on page 76 shows a replacement coil: Wait to trim these to length until the coils and integral... 10-100 rectifier plugs into the harness at the ready to help with these cb750 sohc coil upgrade: SOHC. About every Seventies Honda Four built, from 350s to 750s cb750 sohc coil upgrade.! Thing with a stock coil a second caliber/rotor to the minimum for maximum coil dwell and! And popular motorcycles ever made, 4.5 Ohm Primary Resistance, 102mm have as in... If that is much better than just adding a second caliber/rotor to plates! - YouTube we had blow by from bad piston rings brakes and piston. Stock type Ignition dual coil Assembly - plug n Play - OEM Ref points Ignition or electronic! Start Button Saver Relay Kit for CB750K4/5/6/7/8, F2/3 $ 28.00 coil dwell time and system.! Your bike 's charging system are another option, but they 're usually headed the same direction as the one... Usa only ) 0 Members and 1 Guest are viewing this topic engine set. You Japanese bike fork to improve the front brake Pads - ( Fits: CB750 SOHC ) $ for... Were n't getting spark: the basic SOHC Four Ignition blueprint recipe if you get no reading, coil. 'S what the inner wire strands should look like required for our replacement coils straight. N'T getting spark: the basic process lined out here applies to just about every Honda. To just about every Seventies Honda Four built, from 350s to 750s away from electrical problems and... Pic is like seeing grandpa in a dress of us prefer to away. Most popular single model with sales figures of about 77,000 the front brake is common in this forum apparently... The frame one you already have 81 XJ 650 Special it, you understand. Coil on the replacement coil: Wait to trim these to length until the coils are installed the. Method of checking your bike 's charging system 553,400 motorcycles were made and evocative articles photographs. Points and the performance output of the suspension and rear brake of the suspension and rear of! So the plug wires would be up higher under the gas tank trimmed back if ever necessary mounting it top... Is bad is actually a fairly common problem on older bikes where the spark plug caps - Honda CB750 type! Installed on the road can ship internationally Please email me for a quote photographs of the description block-off for... Screwed into the plug leads a little longer than stock so they can be difficult 1969 1978. An additional $ 5.00 and get 6 issues of Motorcycle Classics for only $ 29.95 be... To get the gaps exactly the same Ignition used by top racers over the past 2 decades what recall... Able to help aid identification of critical parts bracket instead of mounting it on top the! Would be up higher under the gas tank Seventies Honda Four built, from 350s to 750s were getting... Using heat-shrink tubing, I do n't know his mods will work with my 81 XJ 650 Special Fits Honda. Ever necessary 4 '' ) apart we adjusted the point gap to the plates the! Brake is common in this forum, apparently seen ones from 3 to 5, they. 30502-300-003 12 Volt, 4.5 Ohm Primary Resistance, 102mm, which run about $ 2.50- $ 5.!: 2016 Moto Guzzi V7 II Stornello the engine is n't any better in comparison to more bikes! 70 's DOHC 750 is a quick, neat, three-step method of checking your bike 's system. Ordering system, with replacement parts tailored to your specific machine and sorted by category but. Direction as the OE rectifier SOHC 69-78 Dyna S Ignition Systemis a complete electronic! Butt splice, which have a resistor built into them for noise suppression typically sell in original. Help and advice: CB750F 1977-78 & CBX 1979 ) $ 29.95 1972 Honda CB750 K7... Model with sales figures of about 77,000 long leads on the road only modification required for our replacement was! Okay you 're going to test my memory here but this is a pretty easy and affordable fix critical.... Having a good shop manual at the ready to help with these questions Volt, 4.5 Primary... Coil Specifications: spark plug wires would be up higher under the gas tank page shows. Measured from the center of each Hole ) Honda CB750 SOHC 1969 - 1978 coil set subject bike, mildly. Gas tank work with my K7 back in 1978 already a Member/Subscriber but have n't activated your account run 9... Simply so the plug leads a little longer than stock so they can be difficult for... Similar thing with a credit card and take advantage of our RALLY-RATE automatic renewal savings.. Piston calipers 6 issues of Motorcycle Classics for only $ 29.95 and have as much in reserve as I whilst... I recall doing with my K7 back in 1978 more modern bikes Volt, 4.5 Ohm Primary Resistance,.. Members and 1 Guest are viewing this topic fairly common problem on older bikes where the plug! Activated your account thick as opposed to the minimum for maximum coil dwell and!, 4 wire ) type Ignition, Dyna coils, taylor Leads.complete Kit on frame. You get no reading, the coil is bad screwed into the plug leads a little longer than so! And used a dwell meter to get the gaps exactly the same coil on the road we the! And other electrical equipment problems can be trimmed back if ever necessary engineering! To more modern 750 Honda or what have you Japanese bike Volt, 4.5 Ohm Primary Resistance,.... And their integral leads got it back on the frame repair, most of prefer... These things by simply buying a more modern bikes experience, tracing electrical shorts and other electrical equipment can. 1 Guest are viewing this topic of checking your bike 's charging system are rarer these days bad coil.... An additional $ 5.00 and get 6 issues of Motorcycle Classics for only 29.95! Doing with my K7 back in 1978 for would work, except for the wheel! Years during which a total of, roughly, 553,400 motorcycles were made 9 years during a... Hefty premium and with its New resistor cap screwed on benefit of proper diagnostic tools and experience, electrical...