what is the difference between the stock cylinder and the Hetrick B52 or WRH Pro mx cylinder ?
power , torque , etc...?

 

Basically they are changing up the timing of the cylinder. In a 4 stroke engine you do this with valves and cams. In 2 stroke engines you do it with opening in the cylinders. They true up the opening to allow the air/fuel to move at the times they feel is best for their engines and pipes. Porting is done to increase both horsepower and torque. You can imphosize one or the other depending on your application. Both men are great at what they do. I will say to buy both pipe and cylinder from the same person. That way you know they are made to match.

 

I buy a head to WRH some weeks ago and it was a big difference. Billy is a good guy at phone (I speak english like a cow) and he give me good advices. I think if I have to buy a cylinder , it will be to WRH racing but can you say me how much HP more I could have with this cylinder compare as the stock one (3.75 mm deck , 1to 14 compression ratio now ).

 

Right now we are running the WRH cylinder and head with 28mm carburetor and an EX-Pipe. I have never put Koty's on a dyno but my SWAG is around 15hp to the wheels.

 

The WRH cylinder , is it alu cylinder ?
You say 15 hp at the rear wheel . How much in the engine ?

 

That's Ok most of us are Cow's anyway...LOL. Just playin with you Tonnere.

Billy is a great source for your predator needs as you already know.

What type of racing do you do over in france???

 

We don't race exactly in France but in Belgium .We live just near .In France , it is not possible to race before 16.
For the race , I think it is like in states .
12 mn to practice and 3 times 12 mn ant 2 laps more.
The rules :
93 cc max , vario , after , you can make what you want.
35 racers , 1 E-Ton , 1 Predator , 33 suzuki (baaaaaaaaaaaa!)