how reliable is a stroker crank for my raptor.

and also how much hp will it add.
thanks.

 

Strokers are usually pretty reliable as long as it's done correctly.
Multiplying your bore x stroke gives you 660 cc, correct. Multiply your bore x your new stroke length to find out how many cc's that is then figure how many more cc's it is by percentage(5% or 10%)then add that percentage to the horsepower you have now. That will give you your new horsepower number. You might find only doing a stroker crank by itself won't give you the number you're expecting. When you change the cam and bore out the cylinder bigger and put a higher compression piston in as well as stoke the crank all at the same time, then you will be impressed with the results. While you have it all apart do everything or wait until you can.

 

Well at least everyone here knows how serious you are about these forums and their purpose. We also know that some people must act like children.