reboring increased power?

[nipper]

hi i have to rebore my z and was wondering if there is an big power increase if i bore it out to the max(what is the one size below the max)? and what are the disadvantages? will i have to rejet?
n what do you recomend?
thx
nipps

[twgranger]

bore it out to the max! That is a stupid idea.

[nipper]

thats why i want to know the one under max?
anyway what would u recomend i bore it out too?
nipps

[KASEY]

the 2 mm's difference between stock and .080 is designed to give the cylinder long life,,, not a big power increase.. going 2mm will not make enough difference to even feel on a stock machine,,, you will get way more bang for the buck with a aftermarket pipe,,,, also if you do bore it out and have a problem instead of going to the next oversize you will be going to the cylinder store for a new cylinder or sleeve,,,,,, :D :D :D

[smokinwrench]

Yes like Kasey said, you won't notice much increase. Just take it to the machine shop and have it bored to the next available size.

A pipe and a port and polish job will give it the most bang for the buck. A port and polish while the cylinder is already off would be a great idea if you have the cash. I would say a port job from a respectable engine guy would cost $175-$250.

[C W.]

kacy and wrench know there stuf save the jug get a pipe

[Wickedfinger]

Any time you "overbore" any 2-stroke, you will actually lose power unless you match the ports timing angles back up to the new bore.

[J.D.]

These guys are all right. I think the actual increase would be like 10CC's tops, which like they said will hardly be enough to notice.