SOHC.co.uk Forums > CB500/550

Number 1 cylinder not firing compression issue

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McCabe-Thiele (Ted):
I would expect number 1 exhaust to get hotter if there is fuel, the black plug is interesting as it's obviously firing albeit not properly. Do you have another plug lead you could try before taking the head off? I'm thinking the spark could be failing under load.

When I first fired up my 400 before the restoration the compressions were on the low side but all four exhausts were red hot.

kevski:
To me this suggests the pilot circuit is suffering a blockage and needs to be looked at, the soot on the plug is not unusual in this situation, before you remove head check everything else again, compression reading is not too bad considering that cylinder is not up to temperature.

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