Topic: Overbore cylinder question from newb

[jasonseasen]

Hi,
I picked up a basket case that I have been assembling over the past months. I noticed today I have a set of 65mm pistons and Wiseco rings. However, I will need to bore out the cylinders to allow the pistons and rings to fit. I measured the bottom to the cylinders for their thickness, the inner diameter is 64.2mm and the outer is 68.8mm.
My question, if I bored these cylinders to 65mm, will that leave enough thickness in the cylinders to perform properly? Also, should I be measuring from the bottom of the cylinders or the top?
Thanks,
Jason

[Big Jay]

If it is a 750, you can safely bore them to 65 mm, but that is about it.

Jay

[MCRider]

65mm is the ubiquitous 836cc kit. Most popular overbore, hop up kit.


For fun
http://www.nightrider.com/biketech/calc_displacement.htm

Buy it from Big Jay. They can do the boring too.   

[jasonseasen]

Thanks!
Also, is there anything specific that needs to be done to the head, besides a correctly sized head gasket? The standard pistons fit nicely under the valves, just wondering if that area needs to be resized?

[MCRider]

Thanks!
Also, is there anything specific that needs to be done to the head, besides a correctly sized head gasket? The standard pistons fit nicely under the valves, just wondering if that area needs to be resized?

Nothing else "needs" to be done. There is plenty that can be done. But its a budget issue, not a technical one.

[MRieck]

Thanks!
Also, is there anything specific that needs to be done to the head, besides a correctly sized head gasket? The standard pistons fit nicely under the valves, just wondering if that area needs to be resized?

Nothing else "needs" to be done. There is plenty that can be done. But its a budget issue, not a technical one.

  That's gospel MC

[Bill/BentON Racing]

Speed co$t money,how fa$t you want to go?,Big Jay sure like 1000cc kit, cylinder and top case 1/2 on way week afer next,on vacation now,Pistons are impressive,whole kit top notch,I think Jeff said if I send Sam Green 2009 Tour T shirt I get 20% off? Cool Thanks,Bill