Question about 2007 Honda CRF 70 F
This could be a few things.
1.) too much oil in engine.
Too much is just as bad as not enough. check and correct level.
2.) sticking or worn piston rings.
Most likely problem as these little bikes tend to get revved real hard.
replace worn parts or upgrade to the 47mm kit 72cc barrel kit, £40 uk pounds
3.) Valve stem seals worn.
cheap easy replacement if this is all it is, but you can get a complete cylinder head with cam, lifters, valves etc ready to fit for about £45 uk pounds
Posted on May 31, 2011
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Posted on Jan 02, 2017
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