raced my bike against my brother in laws, both of us have 2000 models both with aftermarket airfilters , exhaust system, he is stock i have aftermarket , he is stock on the carb with 165main jet i got stock carb with 155main jet with all the mods, i can pull away from him at the start 2 bikes and he will close up by the end of the race, need more top end power i do have a biggun cdi coming .. by the way did anybody read the QUAD magazine article BIG BORE SHOTOUT ds650 vs kfx 700 vs rappy700 they make the ds look like crap

 

Well, you certainly dont need to believe everything you read in the magazines....they seem to be very bias. LOL!

If you want more topend, you might want to try a gearing change. If you pulling him that bad out the hole then that might be all you need. If you need more power, then you need to look into buying a carb. Yeah, that will make you smile, [img]i/expressions/face-icon-small-smile.gif[/img]

 

>>make the ds look like crap

That aint gonna be easy since my body work is orange.

 

is it true that if i put a bigger jet that afects from 3/4 to full throttle may be more top end dont realy know, by the way my son is in love with your spiderman bike he whants me to painted like yours.

 

LOL! Thanks. I get comments quite often from parents who say their kids like my bike...I like that. In fact, thats one of the reasons for doing the Spiderman theme. [img]i/expressions/face-icon-small-happy.gif[/img]

Yeah, the main jet does manipulate the 3/4 to full throttle. But, I wouldnt say that it will guarantee you more topend.

 

Why are you running a smaller main jet with a pipe than he is with a stocker?

 

the 155 jet was on the bike when i got it at 4200feet of elevation it races good i think ican outrace most of my friends i even took acouple of races from a lt500 quadzilla so i really was happy the way its running but if anybody is got a suggestion go ahead

 

Were you both racing at 4200 ft? I don't know if you have dyno tuned your carb but if that isn't practical, I would do a nice long run at WOT, kill power and coast to a stop then check your side plug. If it is white or ashen gray, you need more fuel. If it is a nice light brown color, you should be fine. Look elsewhere. Before I changed anything else, I would make sure you are getting enough fuel at the top end. To me the main jet sounds small even for 4200 ft.

 

Max are you both running the same height of tires?
Taller tires will give you more top end.

 

Excellent point. Figure out everything that is different in the comparison. If he has taller tires, that will also hurt his bottom end giving you an advantage off the line.