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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
XR100 engine trouble
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[QUOTE="qwchrbeliakn, post: 623112, member: 41517"] I still can't get over how well it ran when I first put the carb back on. Like you say the problem is when the bike warms up. thanks again. It ran good for a few minutes after the carb maintenance...a few possible causes come to mind. 1.) If the floats are adjusted such that too much fuel is in the float bowl, the engine would run good in the initial minutes while the float bowl was filling up...but not quite full. When the float bowl was almost full the engine will start to run richer and cause the misfire situation you're experiencing. When the carb is apart you also need to test the float valve (do this by blowing into the fuel inlet tube and toggling the valve open and closed). You can test if your problem is float bowl related (i.e., incorrect float level or bad float valve) by draining all the fuel in the float bowl with the fuel tank valve (petcock) off. Then start the bike and see if it runs good for a few minutes...as before. 2.) Another possible cause that came to mind is with the fuel cap. If the vent hose is not allowing air to enter the tank a vacuum will develop in the tank. This vacuum will hinder fuel flow into the carb. This cause is consistent with what you found by turning your airscrew in all the way to get a better idle. 3.) If the bike runs good for a few minutes, but only when the bike is cold, I would suspect the coil. I have seen many coil failures with this symptom. You could take the coil to a shop for testing if you do not have an ohmeter. A good looking spark when viewed with the spark plug hanging outsite the cylinder is not evidence enough that the plug is firing good when inside the cylinder because more voltage is required to spark the plug when the plug is exposed to increased pressures. Tom [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
XR100 engine trouble
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