Hey gregsims since your the sp500 tuner here on the board why dont you let us fellow sp owners in on the tuning secrets that you have. email me if you dont want to give them out. ehaney@midsouth.rr.com

 

Silverado,
Since I have never worked on an HO, I would not know how to help you. Of Course you know that the carb and cam are different on the HO, which means that what I did to mine to correct my fuel mixture will not apply to the HO. It would be irresponsible for me to give any advise that could damage your bike. Besides that, all bikes are slightly different. Even if you had a regular SP500, I could not tell you for sure how to improve your performance without knowing how and where you ride. I would almost have to ride the bike myself and inspect the plug. My bike is a little on the lean side right now, and that is probably why it is as fast as it is.

Greg

 

well i thought these things run too fat from the factory as my HO is right now. you wouldnt now what jet it would be for the next lower # would you? i also think if i leaned her out it would run faster,im going with the high altitude weights also.im runnin a k$n also. hey thanks greg.

 

silverado,
If you know for sure your bike is running rich, you can solve the problems two ways.

1st The way you suggest... reducing fuel to correct the air/fuel mixture. This might help performance, but only slightly.

2nd Increase air flow to correct fuel mixture. This is what I have done with mine. The airbox lid restricts air flow a little too much on the 2000SP500. I am not sure about your HO. I tried a 1.5" snorkel first, which is what I used on my 98SP500. It ran way to rich. I tried the 2" snorkel and it works great. I run a K&N, and I have an outerwear but I just recently removed to to allow for more air flow. The idea is to get as much air flow as possible... if you manage to flow enough air to make the mixture lean, you just go with the next larger jet. The motor is just an air pump. The more air and fuel you can get to flow through the bike while maintaining the proper fuel mixture, the better the bike will run.

I am not sure what the main jet size is on the HO. My late model 2000SP500 has a 162.5. I am probably going to up it to a 165.

Greg

 

have you played with the needle jet any,i know this is for drivability only but was wondering. where did you attach your snorkle???

 

i dont think the jet needle would make it any faster i better leave it alone.