Adjusting idle rpm on KX250A7 ?

[JohnnyO]

I'll adjust the idle by filing the slide.

Filing the slide cutaway?

No that'd lean it out at 1/3 throttle.

That's right.. I'm interested to know which part of the slide is filed to raise the idle? I can't see how filing it will lift it

[John Orchard]

I'll adjust the idle by filing the slide.

Filing the slide cutaway?

No that'd lean it out at 1/3 throttle.

That's right.. I'm interested to know which part of the slide is filed to raise the idle? I can't see how filing it will lift it

A carburettor is just a block of alloy that mixes air & fuel together, there'll be a way  ;-)  Maybe modification of the bottom of the slide to allow some air through and pick up some fuel on the way?

[Slakewell]

You file the front to richen and the rear to lean. So front for idle

[JohnnyO]

You file the front to richen and the rear to lean. So front for idle

Interesting.. One of the bing slides I have for my 490 maico has a small notch filed out of the front of the slide but I haven't tried it

[Slakewell]

IMO that would be to help it from stalling in heavy breaking.

[John Orchard]

I think I'd rather run a small groove from one side of the slide to the other (in line with the port), above the fuel outlets, varying the depth depending on the desired idle rpm.

[John Orchard]

Just for convenience, either putting my goggles on at the line or if I crash in a race, those few seconds of idling can save some hassle.

[evo550]

I always have my 250 and open class MXers set to a dead trottle (not idling) anyway. 250 and in particularly open class bikes tend to push (understeer) in slow corners when they idle. Just my opinion from a mid fielder

You idle through the corners and are still a mid fielder....