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Audun

450 not running smooth

5 posts in this topic

HAve a problem with my 03 wr 450.. It doesen`t run smooth unless I have over 50% throttle or riding uphill or high speed. Feels like it fails to ignite every 5-10 sec.. I have a high comp piston and new jetts.. The spark plugg have a nice milkchocolate color when I ride it hard, but it gets very dark and seems it gets to much gas when I keep to the speedlimits..

Where is the problem?

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Sounds like your float level maybe off. Or you may have too big of a pilot jet. Its getting rich and loading up at low rpms?? right?

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Think Ive fixed it! I just tok the needle out and remounted it one notch down.. So now it seems to run perfectly, but Im stilll thinking about putting inn the 170 main jet..

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No.. I Moved it dovn so that the engine get less fuel from 1/8 to about 1/2 throttle.. I first i took it for a ride.. hard riding gave the sparkplug the right colour, the same when ideling, so then when i tried it for slow riding the plug got al black.. so the engine got to much fuel at this throttle range.. Still aint perfect at the low end so i have to work a litle on the mixture screw..

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