not a 100% sure but its a 95mm bore so my guess would be yes but you have to split the cases anyhow for the crank so whats an extra 100.00 for case maching

 

the cylinder is already on a bike and being testest as we speak, there are more then 3 cylinders casted, but only 1 is being run. The cases do need to be machined.

 

Hpd has a kit for the polaris 400. it takes it to a 416 and is powervalved. it produces 85 plus HP at the crank. I guess a powervalved 500 should be able to make 100 HP at the crank pretty easy.

I believe you can bolt the cylinder and top end from the polaris 400 on the 250R bottom end with a little fabbing. So I guess you can probably use the HPD kit if you wanted.

 

madracing I'd like to race you with my 500 and see the diffenence. P.M. me when it's running and i'll meet you at pismo.I'm thinking of getting one for my other 250r but want to see it run and dyno first.

 

You can have your big bore, 500cc vibrating, aftermarket cylindered 250R that turns 85+HP. There are stock cylindered true 350cc banshees making that easy.

Hasn't Pollet even said that the R tranny will never hold for more than dyno testing?

 

hello? all you do is add weight to the balancer and it wont vibrate, and hows your back after a day of riding your banshee? 250r's do not vibrate at all. its so little that you wouldnt beleive it, ive owned a banshee and i got rid of that thing as quick as i could and bought an R, plus something will break on the banshee while us guys on the R's will be gone

 

93mm piston, weight added to the counterbalancer? Will this thing ever think of reving over 5000rpms? I own a 250r threewheeler that is fitted with a 91CR topend. You are talking about a whole different world when you go from 66mm to 93mm piston.


I know it will be torquey by all means, numbers my banshee will never be able to produce. But I don't think it will ever be the banshee killer that the R guys are hoping for. Remember Pollet is also the one that makes the Cheetah cylinders for a banshee. 400cc trinity cheetah motors are 80+hp and thats on gas!

Edit: sorry I reread the previous posts, it is a 95mm piston.

 

bansheesmoker i will pm you.
alky it has already reved over 9300rpms.i dont want to get in a debate with you over yamaha and honda because i have riden and owned them all.but taking a 250 based motor and doubling it is impressive

 

mine went to 9300 too on the dyno, at 70hp with mild mods, going to step it up a notch next seasion, pushing for 100hp on N.O.S.

 

what size carb? they love fuel