KDX fouling sparkplugs

[Paulus]

Have you checked or adjusted your float level? Checked your overflow hoses are not kinked or blocked? I don't think your bike was designed to flood but does the Husky owners manual say to run it out of fuel before stopping everytime? Who knows, I never owned a Huskie other than my chainsaw and my chainsaw manual does not offer this advice so I kind of doubt it.

It is jetted nicely now and pulls cleanly all through the rev range. It only seems to be trailering it that causes it to flood. I am suspicious of the float height (a common fault on the WR250) but it doesn't exhibit other symptoms. All hoses are clear (hell of a lot of them on a Mikuni TMX). I have never had this problem on a 2 stroke before. I don't rev it hard to run it out of gas just let it run a little above idle till the revs start to pick up and then cut it. Works a charm.

[Pornstar]

But with a little effort a well jetted two stroke will put a smile on your face wider than the lines the four strokes have to take around the track..

Clever

[Sunday Casual]

Late last year I brout a 91 kdx250 it had done 11 hours riding after a full rebuild , I have since done 8 hours riding and Ive just fitted a 2nd new sparkplug , this is my 1st 2 stroke but Im pretty sure that I should be getting more then 4 hours out of a plug???? am i running it to rich? I do cruise on it a bit could this be my problem also The previous owner was mixing it 35:1 and told me that I dont have to go balls out all the time on this bike, any help much appreciated

I run my KTM 250 SX at 40:1 and have only ever fouled one plug when it was brand new. I was sitting there putting it through heat cycles to aid the running in of the engine, and it just cut out. I wasn't too sure why it happened and spent a few minutes wondering and then I concluded it was the plug.


Later we found that the petrol in the tank was mixed at 32:1 which is far too rich for the 250. We put a new plug in and now the bike is about 60 hours old and on the same plug. I think that the fouling of it may be a mix of things - too rich and the oil being unable to burn off.


You may find a remedy in running the bike leaner and occasionally when riding, revving it up just to clear that oil off of the plug. Try to avoid excessive lugging too. If this still doesn't fix it, it may be time to reconsider your jetting.


Cheers.

[antferny]

hey guys thanks for all the advice , for starters I have removed cleaned and reoiled the airfilter checked all hoses and clamps on the carbie and replaced a couple that were old , made sure no hoses were crimped or blocked. Its running an NGK Iridium br8eix plug as that is what was in it when I got it. When I get more time will remove carb and have alook at that.Am going on a ride tommorrow so will just stay in lower gear and keep revs up and see how things go

[Reckless]

Iridium plugs are a bit more pron to fouling than a std Br8. If your not racing just trail riding you won't notice the difference between the Iridium plug and a std plug! Just something more you can look at and it'll save you $20 bucks a plug!
This won't solve a jetting problem but might help save a little in plugs?

Secondly, run it hard to the trailer hit, the kill switch ( without idling it), take it out hot, have a look, is it black and wet with fuel on the center and the outer ring (under the thread). If it is you will need to re-jet.

[Ktmboy]

Ahh...I've found that Iridium plugs work great on road bikes for some reason but are a scrouge on dirt bikes. Had a another example today.
Buy a good quality NGK BR8EGV race plug for $30 bucks or what ever they cost and be done with it. They work.

[Reckless]

Ahh...I've found that Iridium plugs work great on road bikes for some reason but are a scrouge on dirt bikes. Had a another example today.
Buy a good quality NGK BR8EGV race plug for $30 bucks or what ever they cost and be done with it. They work.

I use a Br8eg, they last a year and never had a problem, $12 bucks I think??

[Ktmboy]

Yes we use them for most bikes but when you need a plug that can cover a wider scope of riding (race as well as trail riding and pottering around) and possibly hide deficiencies in carb jetting then obviously the higher spec plug would be better.

[Reckless]

yes Agreed!! as I typed that I was thinking of getting an egv for the Scrambles weekend LOL!!!

[Ktmboy]

FYI, we are carrying spare plugs at The Sandpit. A fairly complete range. The BR8EG are about $10. Saves coming all the way from down south and fouling a plug in the first 10 minutes.

[Reckless]

Ha thanks anyway but I always carry another plug its the only fix smoker ever needs!! LOL!!