SOHC.co.uk Forums > CB500/550

bad tickover on 500/4

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mickwinf:
Nice and sunny here in Scuthorpe so had a little ride to warm engine to do final setup. It starts easily and runs ok on higer revs but tickover is erratic, it seems to race for a few seconds when i close the throttle then after a while sometimes will settle down, if i reduce revs with the tickover screw it cuts out. So i did all the usual things, new plugs and points, timing set, checked for air leaks around rubbers etc then adjusted and ballenced carbs. There was an improvement but still not right, also carbs have been ultrasonicly cleaned and rebuilt,any ideas what else to check?

Bryanj:
could be worth a compression check, when working  I had same problems on a C50 and comp was 110 instead of 140, turned out exhaust valve was just starting to burn

deltarider:
Could it be something simple as (very) old gas?

K2-K6:
I'd go with both of those.....compression check just tells you so much and it's time well spent.

Fuel can be very unstable now if it has any ethanol in the supply, so if it's not new then change it before you go any further.

Just a note about the fuel as a way of preparation to laying-up a bike....it's worth draining and using the fuel in a current vehicle when you store the bike......then using new fuel when you start again.

mickwinf:
just filled with fresh fuel after rebuild and tank cleaned and sealed. Will check compressions but i had another thought, the only thing i didnt do when i rebuilt the carbs was take out the emulsion tubes, so will do that next.Thanks for imput guys.

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