SOHC.co.uk Forums > CB500/550

flat spot

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deltarider:
Just curious. What's the stamped on number on your carbs?

mickwinf:
carbs are 627b stamped on all 4.

mickwinf:
still having problems, finally had time to check the needles, they were in the second groove from bottom so I put them in the middle groove, with a slight improvement, but now having issues with ignition timing and points gap.I have new points plate complete but pattern part and quality seems poor, when I set timing properly it runs badly, then when I fiddle with gap it improves somewhat but wont tick over now. spent hours yesterday, now fed up, thinking of selling it!! Should I go to electronic ignition?

totty:
I've read loads of posts about pattern points and plates, none of them positive, but one post (on the US site I think) gave tips on how to shim the plate to make it usable. When I had similar issues to yours I fitted a Boyer kit, as it included coils and does away with the mechanical advance it was the cheapest way of replacing the entire system. All genuine parts is the other alternative.

Johnwebley:

--- Quote from: mickwinf on September 01, 2015, 09:07:01 AM ---still having problems, finally had time to check the needles, they were in the second groove from bottom so I put them in the middle groove, with a slight improvement, but now having issues with ignition timing and points gap.I have new points plate complete but pattern part and quality seems poor, when I set timing properly it runs badly, then when I fiddle with gap it improves somewhat but wont tick over now. spent hours yesterday, now fed up, thinking of selling it!! Should I go to electronic ignition?

--- End quote ---

 I can advise you on Boyer ignition,used it since late 1970's,been wonderful,nice fat spark,I run a 33thou plug gap,and have a nice
tickover and revs to 9k,

 well worth investing in,

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