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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
CRF 250 R will not start
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[QUOTE="Ol'89r, post: 1428822, member: 17212"] Like Brian said, you need feeler gauges to check the valve clearance. Plus the knowledge of how to check them. If you don't already have a service manual for your bike, you should get one. Read it cover to cover and then read it again. You will have a much better understanding of how your bike works and the tools you need to work on it. If you remove the head you can pour gasoline into the intake and exhaust ports and if the valves are good gas won't leak out of them. If gas leaks through the valves, you need to do a valve job. Keep in mind the valves can be excessively worn or cupped and still seal. It's best to remove them and visually inspect them. While the head is off, you should remove the cylinder and check the piston. Rings should be replaced due to the fact you have 60 hours on them. Inspect the piston at the skirt area. If the skirt is excessively worn, replace the piston. A micrometer is the tool you need for this. Specs are in the manual. I would recommend you find a buddy that can help you with your bike or a local machine shop that works on motorcycle engines. Learn to do the disassembly and assembly on your own and let the machine shop do the tricky stuff. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
CRF 250 R will not start
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