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Dirt Bike Brands - Other
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[QUOTE="DLHamblin, post: 1204741, member: 61339"] Not sure if you aimed that at me; but your bike can be jetted right and still need a hotter plug you know. The standard plug heat range as listed by the manufacturer is targeted for the intended use the manufacturer designed it for (MX in the YZ's case). Deviate from that one way or another enough and a different plug heat range can be called for. Trail and woods riding generally involves a lot more low/closed throttle so there isn't as much heat being generated to keep the plug at its optimal "self clean" temp and it developes a carbon coating. One step hotter plug will help burn these deposits off preventing the cold fouling symptoms he describes which generally happen at the next start-up. You are correct changing heat ranges to fix bad jetting is not a correct approach and also to never jump two ranges hotter; but just as well trying to get your bike to run lean enough (hot enough) to get a too cold a plug for the use the bike is seeing can be wrong as well. If he was fouling while riding I would look to jetting as the main cause; but his description of it running fine all day and fouling at the next startup the next day points to too cold a plug for the type riding being done. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Age old question
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