I'd like to see who everyone says, (from experience), is the best 4-stroke engine builder out there. What kinds of power are they get out of a 416 and 440 kit? And prices? Any help or info you can give would be GREATLY appreciated. Thanks.

 

hey youll like the mx radials when you go into a turn they wont fold and the turf tamers are awesome for a good couple of races that is

 

TC, Curtis Sparks, Powroll

ANYONE BUT FOURSTROKE TECH! THEY SUCK

 

For a pure race bike I would suggest TC or Sparks. If you want more of a playbike, I'd say White Bro's. Powroll has an excellent reputation also. I'm not saying that TC or Sparks can't make a playbike or that White Bros can't make a racer. It just seems like their engine kits are geared towards those types of customers. All of the above have really good reputations and you might be able to find a White Bro's dealer close to where you live.

 

there are 2 udisputed kings of thumpers,Sparks and TC (tom carlson) both have been voted GNC engine builder of the year,TC's # is 814-723-3514,sorry dont know sparks #,good luck

 

I had Powroll do mine,they have a great rep, they've been around since 1964 and you dont stay around for 30 years if you dont know what your doing.Check out they're web site or give Pam a call(541)923-1290.

 

I think GT Thunder is good also. They did some work for me and the return time was quick. They do all of there work off of dynos. Now TC has a problem, they try too make things fit for every bike. Like their silencer for the 400, you have to cut 5" off of your stock headpipe and drill a hole into the frame to make it fit. Now the lectron carb they sell, you have to make a bracket for the airbox, turn the carb at the 1'o clock position and you have to grind you throttle housing to make it work. It makes me think all of there parts were for the 300EX.

 

definately Curtis Sparks!

 

Here ya go, in order:

1. TC


2. Curtis Sparks
3. Powroll

If you want the most power, go TC!