Help - CRF 70 is burning oil after 88 kit install

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Help - CRF 70 is burning oil after 88 kit install

This is a discussion on Help - CRF 70 is burning oil after 88 kit install within the Honda CRF70 forums, part of the General Talk category; I installed the CRF88 kit on the CRF70 base engine and it's burning oil - I can smell it, but it doesn't blow smoke. It's ...

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  1. #1
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    jrod4928's Avatar

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    Help - CRF 70 is burning oil after 88 kit install

    I installed the CRF88 kit on the CRF70 base engine and it's burning oil - I can smell it, but it doesn't blow smoke.

    It's the version with the stock head and high volume oil pump. I adjusted valves to 0.003 clearance.

    Any idea on how/where the oil is getting in? Is the valve clearance too small? It didn't have this problem before installing the kit.

    Thanks!

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    silvjorr's Avatar

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    It can be the oil You used when mounting the kit?

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    Nah - the engine has been run for at least 2 hours and it's still the same as when it first started up.

    The guys at T-Bolt told me they think the valve seals may have been slightly leaky, and the extra bore makes it worse so that it just leaks a tiny bit. They aren't concerned. I don't think it's a huge deal either, just wondering where to start fixing it and if there are any other theories out there.

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    if all the rings are lined up with the gap in the same place it will burn a bit of oil. Could also be as tbolt mentioned bad stem seals. I rebuilt a trail 90 a couple years ago that had tons of oil in the exhaust. It took several days of riding to get the exhaust to stop smoking.
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    This is more weird. ..

    On 2 separate occasions after riding for a little while and shutting the bike off. We tried starting it and the kick starter wouldn't budge no matter how hard you push down. After waiting a while, we kicked it and it started right up.

    Is the piston seizing? Why would this be happening?

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