Again, I did not say Yoshi gave little increase. It gives a whack more than a stock pipe or even a slip-on, but not as much as the other 3 I have tested. If you are going to spend money on a new pipe, then you would get better HP for your money with CT, Sparks or Pro-Circuit. But, if you like Yoshi, then it will also give you good power.

Something that I did not mention.

Recommendations, according to Sparks, Dynojet and some others, you need to use Dynojet sizes, 148/150 in a stock motor raptor with full pipe, K&N and no lid on airbox. This is recommended for bikes at sea level. Some use slightly smaller jet sizes, but you get the picture.

I run similar mods, but do not use the normal off the shelf intake system. I took an L&A adaptor that eliminates the airbox completely and added some extra bits to it, to make it flow better.

I am at 5500 ft above sea level and in summer I run 170/175 dynojets just to get the right A/F mixtures. With the 148/150 jets I cannot even get it to rev more than 3000RPM. For the coast, I need to run 175/180 jets, maybe even 180/185, depending on the temperature.

This setup flows stack more air than the raptors with off the shelf bolt on parts. The raptors you might have raced will never run with those jets sizes I am running and will not be making the same HP numbers as mine. If you want to be in front, you are not going to get it from off the shelf stuff. Everyone else can also buy it and you loose your edge, so you have to be creative.

 

Im running a sixsixT intake and run 180/185 jets @ sea level year round(60-120F). So far NO ONE has beat me around my area. Im sure there are fast bikes, but my raptor is a trail machine and similar quads havent beaten me. Like Freez said, you have to be creative in order to stay ahead of everyone else. I did some testing and my bike was faster with a 14T instead of a 12 or 13. I lost a lot of time with the 12 since I would spin a lot, 2nd gear was useless but I couldnt launch in 3rd either. Also, running with a full IMS 5 gallon gas tank has helped me keep the front end down quite a bit. I too did the float mod and noticed the engine was peppier, not sure if I got 3hp out of it but it runs strong. Another thing I did was use that tornado thing that supposedly spins incoming air to help it mix better with gas. I didnt notice any hp gains but i looks like I might have to jet up cuz my plug looks white now. Im gonna have to dyno my raptor some time soon so I can see how much Ive gained. I sure hope I dont turn out like Austin with only 40somethin hp [img]i/expressions/face-icon-small-sad.gif[/img]

 

Nice carburetor jet instructions.

http://www.kandn.com/instructions/17421.pdf