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  1. #1 crf230 piston compression height 
    C-Moto Not-so-Noob
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    Hi again fellow moto dudes, does anyone out there know the compression height of a stock crf230 piston? That is, the distance from the centre of the gudgeon pin hole to the top of the piston. Please please please help.
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  2. #2 Re: crf230 piston compression height 
    Senior C-Moto Guru zhu's Avatar
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    its just a little bit less than the distance from the pin to the head.
    you are welcome.

    why do you want to know?
    are you planning to use a different piston?
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  3. #3 Re: crf230 piston compression height 
    Senior C-Moto Guru humanbeing's Avatar
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  4. #4 Re: crf230 piston compression height 
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    Thanks for your replies. Zhu: I am interested in using a crf 230 piston in my chinese cb250 engine. They are the same bore and stroke but I think the compression height is a little less on the crf piston.
    Humanbeing: Where did you find this info? It's great. However, is this a picture of a crf piston or a chinese piston? Just had a better look and it's a chinese one, I think the compression height for the crf piston is a little lower than the cb250 piston. I want to try a high comp honda piston but I thought the lower comp height of the high comp piston might be necessary for it to work but if it's the same as a stock crf piston there's probably nothing for me to gain out of it.
    Would you guys know if the chinese make a High comp piston for this engine?

    Thanks again, Gus.
    Last edited by gusmanxtr; 04-23-2013 at 01:36 AM.
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  5. #5 Re: crf230 piston compression height 
    Senior C-Moto Guru humanbeing's Avatar
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    Found in a Taiwanese maker http://www.jccpiston.com/comm/upfile/d_120417_06359.xls
    Difference btw CRF230F "ME09" (KFB) is 0.2mm. Chinese 223 is based on the domestic "MD33" (SL) version.
    The Japanese soultion is 67mm kit.
    http://www.takegawa.co.jp/2008_takeg...ode=1#page=566
    Last edited by humanbeing; 04-25-2013 at 03:07 AM.
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