I am going to be installing a Pro-x 310 kit on my R and was wondering what kind of HP to expect. I have a FMF Fatty pipe and FMF silencer. The carb is stock and am running a K&N. Also, I'm at about 500 feet above sea level. What size main jet should I be running? Thanks for the help

 

the horsepower varies on teh porting. as well as teh jet size.. you could probably expect to run a ..180 or .182 main jet

 

who is going to do your cylinder work, what carb are you going to run, what type of porting. Give a few more specifics please

 

You might want to invest in a new larger carb with the 310 kit. I have ESR's 310 with the 9 porting along with their pipe/silencer and an Airstryker 38mm carb. Check out servicehonda.com on the carb, they have very good prices. With the above setup that I've mentioned, I'd start out with around a 200 main and change the pilot jet to a 52 to 55. With the race dome installed, the HP should be around 50 if I was to guess.