Question about 2003 Yamaha YZ 250

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New plug after warm up and engine running on load for approx an hour engine cuts out and when trying to start again will not start and backfires on kickover. to get started again have to replace with anoth new plug where does the problem lie thanks herbie

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Sounds like you are fouling your plug.Some possible causes make sure you air filter is clean. Correct gas oil mixture.How the bike is being use Trail riding/freestyle.This bike in stock form will foul plugs if it is being used as a trail bike.If everything is good air filter/gas-oil. Then you need to do a spark plug reading. This will determine if you need to rejet the carb. Hope this helps

Posted on Sep 27, 2010


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