SOHC.co.uk Forums > CB500/550

3 cylinder 550

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mickwinf:
thanks for quick response guys will try again. Ref cam timing i reckon it was 90 degrees out, some "expert" did it before, luckily i only turned it over slowly on the kickstarter and stopped as soon as it went solid! hope i have not got a bent valve, i have just ordered a 12mm converter for the compression gauge which should throw some light on it!

K2-K6:
I'd go with a compression check as well just to help you eliminate it if nothing else.

Have always used lab bottle with long plastic spout to squirt a small amount of fuel down the suspect carb when running and see if fires then.

z1100r:
 Well I hope your OK but it doesn't take much to ding a valve. They bend at the head very easy. I was mechanicing for a mate at the IOM tt in the very early 80's he was in the F2 race on a 460 Kirby Honda. A young german lad approached us in the paddock with his cylinder head from his 400 four. His cam chain had snapped as he was kicking the bike over to start it - it bent 4 valves badly. To get him home I took the valves to some engineering place by the harbor and put them in a lathe at high speed and just tapped them with a lump of wood until they spun true. Worked very well..I lapped them in and he put the head back on with a spare camchain we had. Got him round the Island all week and back to Germany. Nice lad he was, kept comming back every night to see how my mate had got on, we had some good sessions on the beer with him.

Spitfire:
It doesn't take much at all to bend a valve, I was turning over a CB450 engine on the bench by hand and just kissed a valve, it bent, and had to be replaced.

Cheers

Den

deltarider:
My first check would be to have it idle in the (pitch)dark and watch for any fireworks (sparks between HTleads/plugcaps and engine).
K3's sometimes have a problem with their carburetor venttubes. Check if they're all (4) open and as a precaution you may cut a few inches where they end (close to the centerstand).

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