Identify oversize piston

**rdlsz24** · 12-05-2009, 10:40 AM

This was in a parts box from one and a half 200x's I bought a couple months ago. 66mm. It is in really good shape. Is it an oversized oem? It doesn't look like the Wiseco I put in my 200x last year.

6

This Big Al's piston was also in the parts lot, but looks kinda toasted. What do you think?

Rob

**shortline10** · 12-05-2009, 10:50 AM

The 200x piston is 1mm over stock bore . stock bore is 65mm . The bapp atc90 piston looks to be shot and good for a conversation piece now .

**shortline10** · 12-05-2009, 10:52 AM

What size is the bapp piston ? For a 200x?

**rdlsz24** · 12-05-2009, 12:45 PM

Right the top piston is 66mm, but what brand? Yes the BAPP piston is from a 200x. Haven't measured the bore though.

Rob

**shortline10** · 12-05-2009, 01:27 PM

Originally Posted by rdlsz24

Right the top piston is 66mm, but what brand? Yes the BAPP piston is from a 200x. Haven't measured the bore though.

Rob

Take a pic of the inside of the flat top piston so I cam see the markings if any .

I know the bapp piston is junk but if you want to sell it I would like to have it for a reference piece . Please let me know

**Dirtcrasher** · 12-05-2009, 03:19 PM

That BAPP must be a 12:1 aaye??

**rdlsz24** · 12-05-2009, 05:42 PM

The only marking I can see on the inside of the first piston is ART. Does that mean anything to you shortline?

I measured the BAPP one with my calipers, and it is also 66mm. I sent you a PM about it.

Rob

**shortline10** · 12-05-2009, 05:45 PM

Art I believe is a stock honda oem piston .

**rdlsz24** · 12-05-2009, 05:48 PM

Is Sudco the same as oem? http://www.sudco.com/art.html

Rob

**shortline10** · 12-05-2009, 05:53 PM

I didnt think so but according to that web site they are . Back in the day sudco made some kool parts for the atc90 .

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Identify oversize piston