atk claims 48 so sure with a stroker and 450 piston you would be more that 50hp. Aftermarket will add aobut 5 hp over stock then a 450 pistion a few more horse. So??? What about head porting what is the hp gain?? Maybe brads new exhaust will give more hp that the moto ti pipe!!
Originally posted by jacobw What about head porting what is the hp gain??
I believe Timbo has said that the porting results in a small power increase, but mainly gives you better starting characteristics and possible a bit smoother power delivery.
ATK did their quote from a bike motor on a dyno. It might even be at the crank.. ATK doesn't have a dyno, but a Yammy dealer down the street does and that's the one I know they used..
I believe Timbo has said that the porting results in a small power increase, but mainly gives you better starting characteristics and possible a bit smoother power delivery.
When he said that he was talking about reangled injectors.Porting is where almost ALL the hp is gained.Stroking the crank gives the most USABLE gain in power.Puts power to the ground and makes quad easier to ride in my opinion.Porting gives it the kick:D