what to bore for a piston

nmdesertrider · Post by **nmdesertrider** » November 21st, 2009, 4:41 pm

if I am boring for an 89.5 piston, what measurement?

robertg · Post by **robertg** » November 21st, 2009, 5:55 pm

You pretty well have to have the piston and measure it. I know Vertex has the actual piston diameter stamped on top of it. It was 89.44mm or 3.5211", add your clearance to that to get your bore. I doubt if a Vertex 89.5mm is the exact size as a Wiseco or OEM.

100hp honda · Post by **100hp honda** » November 21st, 2009, 7:45 pm

robertg wrote:You pretty well have to have the piston and measure it.

yep. first rule everyone should know when dealing with any kind of engine.

nmdesertrider · Post by **nmdesertrider** » November 22nd, 2009, 1:35 pm

how much clearance with cast?

robertg · Post by **robertg** » November 22nd, 2009, 1:59 pm

0.0027" to 0.0041", service limit is 0.005".

http://www.youtube.com/user/500bigbore · November 23rd, 2009, 6:39 am

loose is fast

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what to bore for a piston

what to bore for a piston