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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
04 KX250 Fouls Plugs Often / But intermittent
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[QUOTE="DanAKAL, post: 923312, member: 41820"] telecons, it seems your bike has all of the classic symptoms of being jetted too rich. This is very common with a new bike from a dealer. It is jetted rich as being too rich will foul plugs where too lean will burn pistons. I expect this is why the dealer is telling you not to change your jetting. Besides carb jetting the single most important thing that will make a bike rich is a dirty air filter. Start with a clean/oiled air filter, pick the fuel/oil ratio you want to use and stick with it. Not to get anything started but somewhere between 30:1 to 40:1 should be fine for your 250. My KX is 32:1. Make sure you have fresh fuel/oil and then check the jetting. To get an idea for jetting your bike go here. [url]http://justkdx.dirtrider.net/[/url] This is actually for a KDX but the principles are the same. When this link opens on the left select “KDX Tech Tips” then at the bottom of the page under Engine select “Carb Tuning”. A little bit of reading here will have you on your way to determining the jetting for your bike. I usually work with my carb jetting until I get it where riding the bike is like a “Beast On A Leash” all of the way through operation. The engine is ultra responsive and is hitting very hard. In a five minute ride I can feel the radiators getting very hot through my knees. At this point the bike is jetted too lean. From here I go up one or two jet sizes to make it richer. This usually works well for me and I do not have any further issues with starting and fouling plugs. After you get the bike jetted to what you think is proper run it and look at the plug. It will tell you what is going on. If you have to make an error or a marginal decision make it on the rich side. Better for life of the engine to be a little rich than a little lean. While you have the carb open make sure to check the float and its operation. If you do not have fuel coming out the carb overflow then likely the float is working. Dan [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
04 KX250 Fouls Plugs Often / But intermittent
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