250r motor

[catch me if u can]

I have a 1986 250r motor and i am about to put a esr 310 on it i dont like there porting(not aggresive enough) who is a good person to do the porting and what should i do to the bottom end while i have the motor apart and who would be a good person to do the work. THANKS

[bean86]

I have heard great things about Denny at Flowtech. Great performance and price. As far as the bottom end goes replace all bearings and seals and check the crank over real well because you don't won't that to go and ruin the whole new topend. Also the counterbalencers are weak in the R so check that over too. Other than that check the clutch and you should be good to go.

[fiveOnick]

So have you actually ran the motor, cause ESR normally does a pretty good job of porting for those who ride their bike for all around riding. Specialized porting is available but your always giving up something. Granted they are not completely standardized but I have seen a ESR TRX9 310 with a TRX5 pipe and 38AS pull 56hp strait from ESR. Thats pretty good for an all around bike.

[catch me if u can]

no i havent ran the motor but some guys that had porting from them said it wasnt agressive enough