SOHC.co.uk Forums > CB500/550
Contact breaker points
Oddjob:
Good experiment. Might be an answer for other members as well. DS still has around 24 sets of 1-4s but no 2-3s. If it works it may just be an answer until he runs out of original points that is.
Be sure to let us know, could be very interesting.
florence:
I have found it impossible to set the timing correctly with pattern points. It seems the only way is to adjust as near as possible via back plate with correct points gap and then reduce points gap until they open at the F mark. If I set then up according to the correct procedure, the points never close. It isn't ideal. Makes me want to consider electronic ignition (shudders).
Thank you for your offer OddJob, I can't really afford that at the moment. I have got some old TEC points which I might try to grind back to goodness by gently removing the pitting.
florence:
would anyone be able to explain what happens if the points gap is less that 14 thou?
deltarider:
--- Quote from: Oddjob on August 04, 2026, 06:13:12 PM ---[...] The only solution is to reduce the points gap on both. That means less dwell angle that it should have.[...]
--- End quote ---
Incorrect. The smaller the gap, the longer the dwell angle. A 0,3mm (0,012 inch) gap corresponds with a 49o dwell angle (set at the 4 cyl scale), a 0,4mm gap (0,016 inch) with 46o.
@ Florence in reply #17 Honda specified: 0.3 ~ 0.4mm (0.012 ~ 0.016 in.)
I like my breakerpoints to have the same gap as much as possible. I therefore prefer a dwellmeter using the 8 cyl scale ( 23o - 24,5o) for a stable reading.
You can (re)adjust the dwell dynamically. I do not recommend to set the timing dynamically. Better set and then check with stroboscopic light. You may need to repeat this more than once.
Oddjob:
Oh wow sue me, I guessed wrong after trying to remember stuff from 40 odd years ago. Principle is still the same, wrong dwell angle. Most people don’t own a dwell meter anyway. Really wish you’d stop recommending stuff, you have absolutely no practical experience to base it on after never being in the trade and tbh most of it is wrong anyway. You can watch as many videos as you want about plastering a wall but it doesn’t make you a plasterer only doing the job does that.
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