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chazyH2
 Post subject: H2 piston size
PostPosted: Sun Apr 22, 2012 12:23 pm 

Joined: Tue Jun 14, 2011 5:05 pm
Posts: 102
Location: Chazy New York
Well I dismantled the H2 engine I picked up recently... My question is what size overbore have I got? The pistons are presumably Kawasaki pistons and are marked 0.50 Thanks.

Jim
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Ja-Moo
 Post subject: Re: H2 piston size
PostPosted: Sun Apr 22, 2012 12:42 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
71.5mm

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Jim
 Post subject: Re: H2 piston size
PostPosted: Sun Apr 22, 2012 12:45 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9844
Location: North Central NC
0.50 is 1/2 mm overbore, which is the 1st oversize. The bore was originally 71mm, so you can always measure, and figure how many 1/2 mm increments you are over 71.0.

Since 1/2 mm is close to 0.020", it's sometimes referred to as "20 over", and some pistons are actually marked 20 or 40, etc.. That's done just to make things confusing.

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chazyH2
 Post subject: Re: H2 piston size
PostPosted: Sun Apr 22, 2012 1:04 pm 

Joined: Tue Jun 14, 2011 5:05 pm
Posts: 102
Location: Chazy New York
Great. Thanks for the info guys.
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