trx250r .80 over bore

[89250rhonda]

i guys new two the sight, i bought a trx250r 89 model, it has a .80 over bore, what cc does that mean it is?
scott. :D

[machwon]

According to my calculator, 261.586285714cc. You will need to use the .188 spacer plate and the 86 style piston for any more oversized pistons.

[86 Quad R]

Originally posted by 89250rhonda
i guys new two the sight, i bought a trx250r 89 model, it has a .80 over bore, what cc does that mean it is?
scott. :D

does the cylinder have any special port work done to it? if so, and you later need/want to go beyond the .080 and retain the 89 configuration. do a search on titan racing. he possibly may know of a remmy/piston alternate. :cool:

[89250rhonda]

ok, what exhaust and silencer would you recomend for it, i have a fmf on now but its geting a bit nacked...

[machwon]

ESR would be my recommendation for a pipe.

[89250rhonda]

is it a loud pipe, i want a very loud one :D

[89250rhonda]

just purchased a esr trx-5 pipe and silencer- brand new, will it fit on to my FMF flange? and would i nead to re-jet if it was alredy re-jeted for the FMF pipe?

scott.....

[machwon]

Shouldn't have to re-jet, maybe off one size or two. Just make sure the exhaust flange doesn't have a restricter inside the flange. FMF used to supply those for people to install back with their older pipe versions, I'm not sure if they still do that.

[89250rhonda]

ok, is this a loud pipe? do i nead a KnN air filter?


scott

[machwon]

I'd say they are average on loudness. If you want a better sounding motor I'd do a head modification and porting for race fuel and use a larger carb. That would also make it a little louder.

[89250rhonda]

would you say i nead a KnN filter? or just stick with my twin air one? what sort of head mod, skim it, put a differnt one on?.....



scott