Leak what?

[scotish1957]

On the KXF450 forum they mentioned that the bike came with a 70 leak jet, but runs better with a 55. I'm at 5280 foot elevation, would it help mine. By the way, what the hell is it?

Thanks

[Dave Hopkins]

This carb was desgined for a road bike, carb needs an accelerator pump to bridge the gap from the time you whack the throttle to the time the RPM is spooled up, of heck this could take an hour, go tot he KTM setion, select FAQ, the sellect carbs (i think) and section 2 covers AC pump. Basiacllly the AC pump squirts way too much fuel and the leak jet meters some back tot he float bowl, does not effect "jetting" only responce, going smaller increases the amount of fuel in the AP pump squirt!