Maintenance & Technical > KX250 / KX125

Something kills my spark plugs???

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Caddy 16v:
Hi,

I have a new/ old problem since my bike ('91 KX250) has now successfully killed two of my sparkplugs after around 1h of ride time! I can't really go anywhere without having to worry that I'll die and I'll be pushing for a long time.

The thing is it gets gradually worse, with a new plug it runs crisp and then starts to bog every now and then until it finally has no more spark. When I test the plugs on another bike they are still dead.

I have a suspicion but want to hear your suggestions as well: I'm running a '91 igniter and ignition coil but the bottom end is from a '89 so there is a '89 stator in there and I suspect that is not playing along as it should and kills the plugs!? :?


Thanks in advance.

Openclass:
What color is the plug after you remove it? Black/wet would mean your jetting is to rich.

81cr450:
X2 on jetting, spark pretty well works or it doesnt.
Also if youre running a really cold plug & lugging around that would exacerbate a jetting issue.

Caddy 16v:
I was running a bit rich (dark black color) for a while and the plug was wet at times but yesterday I changed it and it was dry after that, might have been already gone too far? First it was a NGK B9ES and then a BR9EIX iridium plug.

81cr450:
If I'm trail riding where there is alot of lugging & not alot of winding it out I'll run a br7 generally I run a br8 but I do jet a bit rich for my elevation. You do need to pull the carb & check the jet size though. Baseline with a kehin 55 pilot, 170 main, middle clip, with no regard to your elevation temp etc...

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