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Dirt Bike Mods & Maintenance
XR250 won't start when hot
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[QUOTE="Ol'89r, post: 655642, member: 17212"] buju. A couple things to check if it won't start when hot. First check your valve clearance. Make sure the valves are not too tight. Check the pick-up coil. This is the small square coil inside the right side engine cover. Over time they get hot and crack. When this happenes the bike will hard to start when hot. Sometimes the coil wire gets corroded where it connects to the plug cap. Unscrew the sparkplug cap from the ignition coil wire. Nip about 3/8" from the end of the wire with some wire cutters. Look inside of the plug cap where the plug goes. You will see a screwdriver slot. Take a screwdriver and unscrew the brass peice. Remove the brass peice and the spring and resister underneath. Replace the resister with a peice of steel or brass rod and put it back together. When you screw the plug cap back on, be sure to center the pointed screw part directly into the center of the coil wire. One other thing to check would be your intake manifold. When these XR's get old, the rubber on the manifold gets hard and will seperate from the mounting flange. Try to move your carb back and forth and look to see if the aluminum mounting flange bolted to the engine has unattached or seperated itself from the rubber boot. Good luck. :thumb: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
XR250 won't start when hot
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