DOES ANYONE KNOW HOW MUCH HORSEPOWER A 250R WILL PUT OUT WITH JUST A AFTERMARKET EXHAUST? AND WHAT IS THE TOP SPEED ABOUT?

 

Yes, I know.

 

my 250r has a wiseco piston ported reeds and aftermarket exhaust and I say she will do about 75 tops.

 

A 250R with a pipe will probably put out about 35-37 HP. Your top speed probably won't increase much, maybe 2 mph. However, the pipe will make you get there faster, and that is what really counts. You could probably do about 75 with stock gearing, but increasing the size of the front sprocket or decreasing the rear will increase top speed and lose low end power.