Question about Honda CB 250 Motorcycles

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Oil blowing from breather pipe Honda 250

I have a Quadzilla Kasea Buggy with an engine based on the Honda cdr250? The problem is I have oil blowing out of the breather pipe and the power is reduced by about a half.

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  • Ronaldbrains May 11, 2010

    Sorry to tell you mate but the only thing that causes the oil coming out of breather pipe is the piston rings are worn or you have a broken top ring and allowing the compression to go to the crank case and that pressure the system and all the oil running down from the cam or rocker gear instead of returning to sump its the pressure forcing it out of the breather pipe ,,and if it gets worse then it will start coming out of the Seals as well. Let me know how you go Ron

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  • Master
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Mate.Sorry to tell you but the piston rings need replacing.If the motor is pulled down the piston rings will be very thin and need replacing.Possibly with a new piston as well.Seen this before.Its not too bad cost wise,but it does need to be done.Hope this helps

Posted on Oct 07, 2009

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  • Master
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Take out engine Strip down and replace the Piston rings and check bore if got a ridge in it where the top ring stops then rebore it and fit new oversize rings
If worn bad then also new piston as well thats the only way to stop the oil from coming out of the Breather and give you back the power you lost ..
Easy done so do it and enjoy riding the Buggy

Posted on Oct 07, 2009

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