Question about 2005 KTM EXC 525 Racing

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Have a 2005 ktm 525 exc,after 20 mins of riding it starts missing and stalls when slowing down for gate or log ect,when i try to start it takes a bit and will pop or backfire through exhaust, had jd kit added,new plug,valves adjusted ,still playing up,pulled plug out today and seems very black in colour ,

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Sounds rich, especially if its a problem when it warms up, was the JD kit a much bigger main jet,might need to try standard main, is it standard exhaust, I assume the air cleaner is clean and good condition, the foam can deteriate over time.Not sure if you have a hot start button or lever, this leans the mixture, if you have one and it helps then its definately rich

as a non related hint I use moreys upper cylnder lube in my WR it starts easier, idles easier, doesnt stall as easy under hard braking, and doesnt seem to get as hot and ping when working hard in tight bush.

Posted on Apr 28, 2010

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