.120 over is how many cc's???

[CHAUNCY]

Hey
If a 250r is bored .120 over how many cc's it ?
Its like 270 something isnt it ?

[methyman]

your correct actually its 269 cc but your close enough.

[CHAUNCY]

Cool, thanks for the help;)

[Mr_Bub400ex]

is there a formula or nething to figure it out?

[Burden7]

Here is the formula to figure out cc's of an engine.......

Bore * Bore * Stroke * .000786 = CC

[AndrewRRR]

I hope that's an 86r motor! lol (the boring limit for 86 is .120, for 87-89 it's only .080)
.080 over is 265, the upper cc limit for the 250 class

[CHAUNCY]

Yeah, its an 86

love them 86's

[CHAUNCY]

Originally posted by "2-R's Rider"
love them 86's

That why your sellin' the 87 ?;)

actually it has a 86 rod &piston set up in it :p

anyone know where I can get a bottom end ..a good one ?w/o paying an arm & leg ?;)
I wanna build another big bore ,short rod motor anyone?

[methyman]

The actual biggest bore size on a 1985 or 1986 cylinder is .140 which is 69.5 mm. I know because that what my motor is. Its on its last bore before resleeve is needed. Also Wiseco is the only company that makes a piston for it. Opss I made a mistake 69.5 mm is .140 over bore. Sorry.

'85-86- 69.50mm
PI-526P14

[CHAUNCY]

I realized that .120 was the biggest that a 86 would go. Does 87-89 have a longer rod than the 86 ?

^yupper