Either K&T or Dan Hull at A&S. Hard to argue with those guy's power and reliability. There are other great ones as well.

 

it depends on what you want to do who you go through

 

ALBA has great products for modding your quad, good prices

 

K+t, Dunetrash, A&S, Dirtworx, and the list goes on!!!! And it all depends on what you want and how much $$$ you want to spend! A good friend of mine has a stock cylindered(350 jugs) 7mm stroker with triple port exhaust and it rips! For the money in my opinion..... i would do a high rev 350 with triple port exhaust, override and 35.5 alky carbs and call it a day! ive seen 100hp 350's with stock bore and stroke! A stock cylindered stroker motor would be the next step, then you could go on with T-rex or Cheetah cylinders...... or if you got the big bucks just do a ROTAX!!!! THE SKIES THE LIMIT!!!! Just talking about building a Banshee makes me want one again!!!!LOL

 

Has anyone used White Knuckle Racing??

 

guess not

 

Amazing porting, amazing price! : moto814 porting

 

Its all a matter of opinion.

 

ESR makes a 409, someone should try it, they make awesome 250R motors.