TRX 250R question

[OLDRRacer]

I bought a 1986 R and was told it had a 330 kit in it.I was wondering if there was any way to tell without tearing it down. The motor is fresh and seems to run well (haven't had it out yet it needs a shifter).I had a 86R and a87R a long time ago but I have been away from quads for a while. Also on the cyl. is engraved HP does anyone know who they are? Thanks

[8686]

Does it have a stock cylinder on it?

[atv fan 28]

any pics of the motor?

[norcalduner]

Remove the spark plug and put the piston in top dead center. You can try to make out the numbers on top of the piston if not completely full of carbon deposits. Write the number down and repost it on here. Someone for sure will let you know what size piston it is.

If you have a stroked crank, we would have to do a little math haha.

[OLDRRacer]

I will try to get pics of the motor.It is a stock cyl.I will try to get a look at the top of the piston. Thanks for the help.....

[86DUNCAN250R]

not to change your topic but where bouts do you live in N.Y. old racer... I live up at the top in Massena... are you anywhere near me?

[woodsracer144]

Originally posted by OLDRRacer
I will try to get pics of the motor.It is a stock cyl.I will try to get a look at the top of the piston. Thanks for the help.....

i dont think it is possable to run a 330 in a oe cylinder... a 310 you can... 330 is a bit large...

[revman]

Originally posted by woodsracer144
i dont think it is possable to run a 330 in a oe cylinder... a 310 you can... 330 is a bit large...

not if it has a stroker crank in it... 310 with a 4mil crank will bring you to a 330 or real close to it.

[OLDRRacer]

Originally posted by 86DUNCAN250R
not to change your topic but where bouts do you live in N.Y. old racer... I live up at the top in Massena... are you anywhere near me?

I'm just South of Saratoga 86 Trying to get ready for some fun on the ice ....

[OLDRRacer]

Originally posted by woodsracer144
i dont think it is possable to run a 330 in a oe cylinder... a 310 you can... 330 is a bit large...

That's what I was wondering. As I said I have been out of it since around 92 and they wer'nt getting em very big back then.A 310 was a monster lol.

[OLDRRacer]

Best I can tell the top of the piston has this on it.I'm not sure about the 3rd digit. This is all I could make out.Thanks, George

32*NO65U
CO

[woodsracer144]

Originally posted by revman
not if it has a stroker crank in it... 310 with a 4mil crank will bring you to a 330 or real close to it.

good point... when i think of a 330 i just think of a Big bore cyl that needs case work and time... haha!