SOHC.co.uk Forums > CB500/550
Fouling plug
mickwinf:
I have a problem with spark plugs. After being stood for a few days without being used my 500/4 is a bit reluctant to start, then only fires on 3 cys, number 2 wont fire. If I remove the plug it is wet and wont spark, a new plug and away it goes! This has happened a few times now, the bike runs great once going, timing spot on, all plugs are new NGKs carbs set and balanced, new filters etc. I am a bit stuck for what to check next?
matthewmosse:
Plug cap or ht lead? does the plug work OK if swapped to another cilinder?
Paull:
If this happens every time it stands still I would agree with caps and leads but add reg/rec check.
I do warn you NGK plug are not as good as they could be, 2 in 10 new plugs go in the bin. :(
Paull
mickwinf:
caps and leads are new, I replaced coil because duff plug fooled me into thinking coil was u/s. I also checked compression, 125psi.Why reg/rec? battery holds charge ok.
Paull:
Sorry for late reply.
Reg can brake down and over power the plugs burning the diode out.
Just make sure the correct voltage is coming out of it.
Paull
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