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Honda MX & Off-Road Dirt Bikes
Brand new cr125r died on me after 30 minutes, need help
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[QUOTE="rmc_olderthandirt, post: 1310188, member: 68872"] I wouldn't re-jet until you have more time on the bike and bring your skill level up. Two cycle engines don't like to "putt". If you are a novice and riding around nice and slow then the engine is not going to heat up to full temperature. With the engine running cold the plug will foul easier. You could rejet the carburetor and compensate for this but in a few weeks when you start pushing the bike harder the jetting will be wrong again. Switching to a "hotter" plug is an acceptable approach to solving the problem, it is not a "bandaid". A hotter plug will NOT make the engine run hotter, it will just make the plug run hotter. The plug needs to run hot, hot enough to burn off the gas, oil and combustion byproducts that get deposited on it. A hotter plug will allow you to putt around and not foul and still keep the carburetor jetted properly for when you do open her up and push it hard. Later, when you are riding more consistently at a harder level, you may want to change back to a colder plug to avoid any pre-ignition, which could happen if the plug was running way too hot. For what it is worth, I run BR8ES plugs on my bikes. I will still foul plugs when I am trying to ride slow with my wife on her quad. I have learned that I need to ride in circles occasionally to keep the plug from fouling. Rod [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Brand new cr125r died on me after 30 minutes, need help
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