SOHC.co.uk Forums > CB500/550

3 cylinder 550

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Spitfire:
That's great news, nice when a plan comes together.

Cheers

Den

mickwinf:
bad news guys, it has gone back to 3 cyls! this time no 2 cyl is not firing properly, the engine sounds ok but a little flat, the no 2 exhaust is not getting hot, but it runs worse if i remove no 2 plug cap so it is doing something.Oh no i thought, another valve, but compression is 140 psi. I tried another plug which seemed to help a little but still not right.Anyone had similar probs? Mick

Bryanj:
Bad plug cap or low battery voltage?

mickwinf:
hi bryan, battery is charged, bike starts first kick,coils and caps are new,but i will try another cap in case i have a duff one

matthewmosse:
I seem to have had a few dud spark plugs in the past few years which were dud streight from the box, and one that the threads parted company from the rest of the plug - not overtighened as on inspection there was the yellow passivate plating inside the broken metal of the plug so new isn't always known good.

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