Hi guys.

So I've had my 2010 KLX250S a week now - brand new out of the box. I got the dealer to remove the snorkle from the airbox and fill in the carb sliders 2 holes from day 1, but I noticed the bike was running pretty lean. I had them take a look at it on Monday and asked them to maybe dial up the air/fuel mixture a little to help in the early stages of the rev range at least, but to be honest it almost felt like it was running leaner after that!

So anyway, one of the things the dealer mechanic said was that the hole left after removing the snorkle is a little too big for the stock jetting, so try covering about 2cm's (just under an inch) of the hole and see if that helps. I did that last night using some duct tape (is there anything it can't fix!?) and WOW! What a difference! She feels a lot smoother and more responsive from just that simple tweak.

Just note that the Aussie KLX250S comes stock with a #35 pilot jet, and a #132 main jet. I believe the US model comes stock with the same pilot jet, but a much leaner #118 main jet - so covering a bit more of that snorkle hole may be necessary. It's worth playing with anyway.

As soon as she's run in properly I will be looking to go stage 2 with a pipe and re-jetting though. It seems there is a LOT of untapped potential in this engine.