Question about 2005 Honda CRF 250 R

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Not starting hi, no compression well little compression and oil in the air filter????? need help please

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Hi there

  • Low compression, and lots of blow-by forcing oil into the air filter via the the crankcase breather. Sounds like you need a top end rebuild. If you can get your hands on a compression tester, then check it. If it comes in under 120, then certainly time for a tear down and top end rebuild.

  • If you put a quick squirt of oil down the spark plug hole and if the compression pressure goes up on a second compression test, then rings/piston/bore are worn. If it does not come back up, then it may be leaky valves, or a blown head gasket.

  • do the compression test first. That will tell you where to start. Or, if you have the tools, tear the top end down and inspect. A motor re conditioner/machine shop will help to measure up and tell you if piston, and bore are ok. May just need new rings to freshen up.

Happy to answer any questions that you may have.
regards robotek

Posted on Apr 25, 2010

Testimonial: "cheers,hopefully be up and going asap.just had the bike back from shop so devastated cant ride...AAARGGGHHHHHH"

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Rings need to be replaced

Posted on Apr 25, 2010

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