SOHC.co.uk Forums > CB750

Ignition timing question

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Craizeehair:

--- Quote from: Bryanj on August 29, 2023, 11:42:31 PM ---The effort to set points gap at 14 thou and get the timing spot on the F is worth it but do keep rechecking it as moving the plate alters the gap and altering the gap moves the timing so takes a lot of care and time as a novice but well worth it

--- End quote ---
Thanks for this advice, I finally got round to checking it again today and it wasn’t exactly where it should be. As you say, adjusting one threw others out and I hadn’t realised.

I spent what felt like an age, adjusting and setting points gaps and the timing marks on the F marks. I just couldn’t get 1-4 and 2-3 all adjusted bang on correctly at the same time.

As you rightly said it was a lot of care and time as a novice, although I did get there in the end.

But by ‘eck… was it worth it! A marked difference, the bike is running so much better.

Tick over when warm is now so much better, it used to tick over very low, perhaps 700-850 rpm. Now a steady 1050 rpm I would say, which also makes it sound so much better.

It has opened up more at higher revs and higher speeds, it always felt restricted approaching 60-65mph and never really hitting the higher revs comfortably, tonight she ran like a top.

Thanks for the help and advice all.

Trigger:
CB750's do sound nice once they are spot on  ;)

Craizeehair:
Don’t they just and they don’t look too shabby either! Here is the bike during the run this evening. What you can’t see is me grinning from ear to ear!

Trigger:
Nice looking early CB750. That would of originally come with the Hitachi plate and ND points  ;)

McCabe-Thiele (Ted):
A very tidy looking bike you have there. ;D ;D ;D

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