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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
spark plugs for breakfast
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[QUOTE="DLHamblin, post: 1004591, member: 61339"] Not necessarily. Depends on the bike (stock/modified), jetting, and rider ability. While its correct to say you shouldn't use spark plug heat range to try and fix bad jetting; its also equally wrong to try and fix all spark plug issues with jetting as well. They kind of go hand in hand. An example is my son's YZ-85 (2006). Stock they come with a BR10EG which lasts about 30 minutes even if jetted correctly (unless you are on a MX track where the throttle is never closed). Be on a slower track or trail riding and it fouls in 30 minutes (with proper jetting). Lean it to where it won't and the bike is too lean and runs like crap. Put a BR9EG in and it will run for weeks (for just trail riding we use a BR8EG). Bike runs well and neither plug looks like its running too hot. Bottom line is don't randomly drop 2 ranges without doing some follow-up checking; but if the jetting and top end condition are good; don't be afraid to go one range at a time hotter plug. The bike will let you know its too hot by pre-ignition (which is what would burn the piston, not the plug itself). [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
spark plugs for breakfast
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