How to measure piston.

gharmon
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Valley, AL US
gharmon
Edited Date/Time 8/13/2014 11:53am
I also have the CRF 250 cylinder head question listed here so sorry for the multiple posts on the same bike. I have my 2007 CRF 250 engine down with the head sent to millennium tech for inspection.

Here's my other problem. I bought this bike used and have no idea of it's history other than it had some serious change spent on it. Okay I need to order a new piston kit for it but don't know what to order.

Stock bore is 78mm. If I measure the piston that just came out of this engine it measures 81 mm measuring with a dial caliper around the piston skirt. There is no name on the piston or overbore size like you see on car pistons (I've never dealt with an over bore on a dirt bike). Where is the correct place to measure a piston (is the skirt the correct place)?

Here is the only numbers on the piston. Can anyone help me with this,

11001-P01 on one side and on the opposite is
1597E
These are listed on top of the piston.

Any ideas?

Thanks,

Gerald
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rick's mx
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rick's mx 8/13/2014 8:10am
8/13/2014 8:10am
I googled "honda 11001-p01" and it showed a cylinder works 81mm + 3mm oversize big bore replacement piston for crf250f. Hope that points you in the right direction.
gharmon
Profile picture for user gharmon
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Valley, AL US
gharmon 8/13/2014 11:53am
8/13/2014 11:53am
Yeah thanks. I search the other day and couldn't find anything, I tried again this morning and found out that its basically a replacement piston for cylinder works 269cc overbore kit. I don't know what I did different but I did try a search before posting here and found nothing. The all of a sudden there it is.

Thanks though.

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