SOHC.co.uk Forums > CB350/400

HT Leads on coils

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gtmdriver:
The lower the resistance the more current will flow through the points and the condenser so their working life will be affected but points are not so critical as electronic ignition.

My Boyer system, for example, specifies a minimum coil resistance of 4 ohms.

AshimotoK0:

--- Quote from: royhall on January 26, 2016, 02:47:56 PM ---Thanks for that Ash. Cant say I understood it all though. ;D  Take your point about the cheap multimeter. My garage one is a cheapo but I have a fluke on the work van (couldn't be arsed getting it out), so will test them again with that. Will be interesting to see if the readings are different. Will post the new readings later. Cheers.

--- End quote ---

Roy ...if in doubt ask ..please don't say you don't understand ... I can always elaborate  ;D ;D ;D

Just measured two CB750 coils TEC FL703-12V coils with a high accuracy bench DMM at work and one reads 4.60 Ohms and the other 4.65 Ohms .temperature 19°C.

Secondaries measured 14,540 and 14,930 Ohms ( 14.54k Ohms and 14.93k Ohms). if they read open circuit it is almost certainly the HT leads that have fatigued at the point they come out of the coil. If the reading is much higher you have a supressor cap with resistor fitted internally. Remove the cap and remeasure, in this case.

Brought all of my coils into work to do the fix on new HT leads ... so watch out on here later this week for details and pics.

royhall:
Not a problem Ash. I didn't know what ohms law was, its a long time since I last heard that in college. But thanks to the power of Google I am up to speed. Holding off on the job until your coil repair post appears. Cheers Ash.

Sent from my Nexus 6 using Tapatalk

AshimotoK0:
Out of interest what manufacturer code do 400/4  / 350/4  coils have on them?

royhall:
Will have a look when I get home.

Sent from my Nexus 6 using Tapatalk

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