Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: mickwinf on May 01, 2013, 06:13:37 PM

Title: Fouling plug
Post by: mickwinf on May 01, 2013, 06:13:37 PM: 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?
Title: Re: Fouling plug
Post by: matthewmosse on May 01, 2013, 06:39:02 PM: Plug cap or ht lead? does the plug work OK if swapped to another cilinder?
Title: Re: Fouling plug
Post by: Paull on May 01, 2013, 07:46:38 PM: 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
Title: Re: Fouling plug
Post by: mickwinf on May 01, 2013, 10:23:09 PM: 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.
Title: Re: Fouling plug
Post by: Paull on May 08, 2013, 10:14:50 AM: 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
Title: Re: Fouling plug
Post by: deltarider on May 08, 2013, 03:54:11 PM: Quote
Reg can brake down and over power the plugs burning the diode out.
?
BTW, my 500 starts within a blink next day after being used, two days later still perfect, three days later still OK, but... when bike has stood for 5 days or more it is hard to start. Nothing to do with battery charge (checked this), nothing to do with gas or carbs (checked this too).
Suggestions anyone?
Title: Re: Fouling plug
Post by: Bryanj on May 09, 2013, 07:47:20 AM: Plugs don't have a diode