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Message started by Brendan on 07/13/06 at 04:26:33

Title: Fouling Plugs
Post by Brendan on 07/13/06 at 04:26:33

Hi Guys, I just picked up my bike today and havent had a chance to pull it apart yet but I need to because it is fouling plugs. The guy I bought it off is a mate of my dads, he rode it for a year without problem then one day out of the blue it started fouling plugs. Any idea what would be causing this? I assume its not the jets as the bike ran perfectly for the first year he had it with stock jets. (155 main, 86 model)

I noticed these carbs have a big diaphragm in them, whats that for?

Lastly, I understand some of you guys put aftermarket carbs on, what choices do I have there and whats it going to cost me?

Many Thanks,

Brendan

Title: Re: Fouling Plugs
Post by azjay on 07/13/06 at 06:20:23

fouling is typically oil, how many miles on the bike? did it sit for a while? i've had old fuel do some pretty ugly stuff. is it fouling new plugs? or used plugs?

Title: Re: Fouling Plugs
Post by vroom1776 on 07/13/06 at 09:41:56

Start ny cleaning out the carb & replacing the plug. Then check that you are getting spark. When I was fouling plugs all the time, it was the coil that was bad for me.

Title: Re: Fouling Plugs
Post by Brendan on 07/13/06 at 14:57:45

I havent even started it yet, but for the other guy it started fouling the plugs overnight....i.e he didnt leave it over winter or anything.

The coil sounds like a hot tip....I was doubtful that a carb could break overnight like that. Are you talking about the ignition coil or the stator windings in the motor...I assume ignition.

P.S for electrical parts for bikes visit electrexworld (search for them), they are in the UK and there web site is pretty good.

Title: Re: Fouling Plugs
Post by vroom1776 on 07/13/06 at 15:16:15

part 9 broke on me. $70...

savage electrical (http://www.bikebandit.com/partsbandit/showschematic~dept_id~710838.asp)

Title: Re: Fouling Plugs
Post by klx650sm2002 on 07/14/06 at 05:23:14

If your coil checks out ok then you could try an iridium plug, NGK DPR8EIX-9 or Denso IX24B.

Even if you do replace the coil the plugs are still worth a look.

Clive W :D

Title: Re: Fouling Plugs
Post by luken on 07/14/06 at 08:22:32

BTW, how often are you supposed to change plugs?

Title: Re: Fouling Plugs
Post by Brendan on 07/16/06 at 17:02:19

Yeah part nine, thats the one....the HT coil. Electrexworld got back to me really quickly, they have a coil that will suit...now Im just waiting on a price. Im going to get that ordered, and then clean out the carb etc and I do plan on using one of these iridium plugs, they sound like they could be great. Im keen to get this thing going, cant wait to go for a ride.

In my expreience the ignition systems in bikes are the weakest link, plus when your spark is playing up it can cause a really wide range of symptoms which can be confusing.

Title: Re: Fouling Plugs
Post by Trippah on 07/16/06 at 19:07:32

Just went thru this with my Mazda MPV, started running bad on a rainy 500 mile trip. turned out the coil went bad, causing the 6th plug to foul. Good luck with the fix.