I have a D&D slip on and stock air filter and was thinking about putting in a K&N air filter and getting the dynojet kit (or another jet kit if someone suggests otherwise) but would like to know what kind of gains would be expected?

 

2-5 ponies, but most of all, your throttle response will be crisp and fast.

 

What exactly does the Jet Kit do?

 

It has bigger jets and cutsom tapered needles to allow the fuel/air mixture to be richened up and altered. has anyone installed the ignition advance from factory pro?

 

I am going to do all this at once next season. New slip-on (or maybe full system), K&N, and jet kit. I hear the overall ridability of the bike improves significantly.

 

Hopefully I will do all of this in a month or so. I readd more about the timing advance and it seems to be well worth the money. I would definitely like more midrange hit for coming out of the corners without screaming. So it looks like BBC air filter, Factory pro ignition advance and maybe a factory pro racekit carb kit.

 

i have the d&d ,k&n,and dynojet jet kit on my bike and like the guy said above you will notice a diff in throttle responce

 

You only need to re-jet if you have a flat spot, typically in the bottom end, when the carb is stageing. You'll feel a lost of power for a split second, then the engine will start to rev hard again, that's a flatspot. If your bike does this, then re-jet it, if not, then your fuel air mixture is probably pretty close to optimal so don't bother.

 

I have had 3 different F4's, one stock, one with a full V+H and a Factory jet kit, and my last one has a full Akrapovic, Factory Jet kit and the HRC igniton box. That HRC box is the best money you can spend on an F4. It totally wakes it up. Bumps the redline, remaps the ignition curves, everything. It just dusts my other F4's. You have to get this from a HRC dealer (I think there are only two) I got mine from Thousand Oaks Honda in Thousand Oaks Ca. Runs about $400.