do i need to re-jet my carb?

[bankz]

I have recently bought a endurance racing end can for my xsport 125cc pit bike. i was wandering if you would have to tinker with the jet screw to get it running better. my carb size is 36mm (if this helps). thanks martin

 

[Patman]

A 36mm carb on a pit bike?

 

[bankz]

yeah it came standard with my xsport. it had one of those cone shape air filters which are crap so now i have an air box. so do i need to re-jet?

 

[Patman]

Yes if it run poorly, no if it runs fine. Since you are there it's hard to make any real suggestions from the other side of the screen. Your best bet might be to check the Tech Forum and Eric Gorr's web site for some information on how to properly jet then do the testing yourself. Since most 125 pit bikes have carbs more like 22-26mm any suggestion based on that range isn't going to do you much good.