can anyone tell me anything good or bad about the e.s.r. 330 bolt on kit for the Honda 250 R

Have it on my wife's wheeler. The TRX-9 porting is good if you like to ride around, have overall fun and casual race. If you ride hard or hillshoot or race a lot then go with the TRX-11 porting. I can tell you that the bolt on 330 has only one overbore size available, so you wouldnt want to mess up on the jetting. Since one year ago, I have lightly honed the cylinder and put one piston in on the stock bore. Careful maintenence will last a long time since piston life is only recommended for 40 hours. But overall, there is a nice power and torque difference between the 310 and the 330. Hope this helps,Bubba

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Dana's 370R Honda, 4mil Banshee, 91 Suzuki LT250R, Honda 265 Powervalved Rider, Z-250 Suzuki (Daughter's)
1992 750 Nighthawk, 1974 GT750 Suzuki triple (AKA Waterbuffalo). Our Pictures

Good info - thank you

excellent customer service. i look forward to purchasing a big bore and much more from them this summer. i havent heard any bad things about them.

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1986 Money Pit

good company
i would spend the extra cash & get my cases bored for a normal 330 or 350

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86 ATC 250R 344 Power Valve

344, when I get ready to resleeve the cylinder we will get the cases bored and have it a little better and get a few overbores.

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Dana's 370R Honda, 4mil Banshee, 91 Suzuki LT250R, Honda 265 Powervalved Rider, Z-250 Suzuki (Daughter's)
1992 750 Nighthawk, 1974 GT750 Suzuki triple (AKA Waterbuffalo). Our Pictures

i had a 330 bolt on i ran a 39mm bored to a 40.5 ran it on race gas anf it was was a great bike i would buy one again. it'll run and beat most banshee even with work done to them. kill my brother 420 long rod.

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SLOWER THAN SOME FASTER THAN MOST!

86 trx Sabertooth
727 MAD Racing raptor
04 MAD Racing YFZ450
04 MAD Racing stroker Kasea
99 MAD Racing LT80

GREAT company.Ive owned 2 ESR Motors and loved them.Now i have a 370PV from ESR (see pics) and it seems extremelly reliable and it hauls azz!!!!

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1989 Honda Fourtrax 250R,mostly stock.