SOHC.co.uk Forums > CB500/550

Ignition timing

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Bryanj:
If you cant set at 14 thou with the cam at highest lift and the points still close at lowest there is something major wrong somewhere.

NOTE:-

you set the gap with the points open the most NOT at any particular mark

florence:
Maybe something is wrong then, It's never been able to have correct points gap and that is with the points cam at highest point.  Looking at it carefully it is almost impossible to distinguish the highest point, it seems almost round, maybe it's very worn, it came out of the bikes original engine which was pretty much worn out but I have worked on some pretty tired machines for years and never known a points cam to wear out. I put oil on the felt thing periodically.  Thinking about it logically there must be less than 14thou of lift on the cam otherwise it would work, unless I am missing something.

Hopefully, Dave Silver will have one and I hope not too expensive.  I don't really want to go over to electronic ignition because it's too costly and prone to going wrong.

Bryanj:
It is difficult to judge the highest point when you dont do it very often, i also have never seen a cam worn out and unfortunately it only comes with the complete advance unit, best money ever is the complete points plate from Mr Silver instead of just points, if it it "Loose" int the 3 mountings get some old feelrs or better shim stock from an engineering supplier andform som L shaped pieces to go from the mounting screw behind the plate around the outer edge to take up any gap, difficult to describe but dead easy to do

Yoshi823:
I had a problem on one of my 550s once. I couldn't see what the problem was but it just wouldn't fire up after I had got to my destination & finished doing business. I checked the points gaps etc but it just would not go. Luckily I was within a stones throw of a Honda dealer (Greyhounds in Croydon), so I bought a set of OEM points, installed them & hey presto, first push of the button. When I got home I compared the heel of the pattern points that had been in the bike previously with the new ones...the OEM ones appear to have a Tufnel heel, the pattern items have a plastic heel, & wear quicker. A lesson learnt.

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