SOHC.co.uk Forums > CB500/550

some last problems

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madoc:


There are only three things it can be; petrol, compression and spark.
I know it sounds trite but you will have to go over it all again.

I am new to Jap bikes but I been building up brits and russian stuff, from boxes, and it's easy to get something wrong.
Just because stuff is new then don't assume.
Swap plugs between working/non-working cylinders ?  I have had new plugs fail on more than one occasion; I kid you not.

I just re-aligned the cam on my new CB550 TWICE (see another post) because of what to me (used to big chunky stuff) looked ok. Second time around I didn't tighten the valve adjusters and one had worked loose enough to effectively be doing nothing (running on three). Should I know better .. of course...

mickwinf:
yes a methodical approach is the best, will have a look at the weekend, thanks everyone i think having people to bounce ideas off is one of the best parts of this forum.

mickwinf:
I am pretty sure leads are correct but will check. I dont think the two cylinders are firing at all, but engine sounds ok, it will be something daft!

mickwinf:
Got it sorted! I checked coils and plugs, was all ok, also checked compression, that was ok too so had to be carbs. I had them ulrasonically cleaned and replaced one of the carb bodies, no one cyl. it was running fairly well on three now so i connected up the vaccum gauges and found that no one cyl was way out, so quickly adjusted it and all four chimed in! Well happy, very little to do now for mot, might get a bit of riding in before winter!! Thanks for help everyone, regards Mick

mickwinf:
Well finally i booked an mot, and of course it rained! But it passed! So i can get it taxed and get a bit of riding in before winter then a few more cosmetic improvements ready for next summer if we get one! Cheers, Mick

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