2013 xc 300 jetting

[otter]

Anybody have suggestions?

[Ynot303]

I would suggest trying a search. This topic has been convered quite thoroughly (and well) in the past. 2013, 2012, 2011 all the same I believe.

[Rider Eh!]

I would suggest you sell it and get a 250!

[otter]

I thought you fell off the side of the earth!!! Where you been?
.....you only suggest that so I don't beat you

[WRocks]

I posted a while back so search for it if you want more detail.

I like to run fairly lean to extend range, optimiize power and minimize carbon build up.
Fat needle (L)
158 main, clip at the top, or 1 down from top
Upgrade pilot jet one size richer
pilot air screw 1.5 - 2.0 turns out

I run this in summer and winter.
Haven't blown up an engine yet and I have tried to...

[otter]

Thanks Aaron

[steve-o]

thats pretty lean on a 300, you'd probably experience alot of pipe bang or knock with setting like that, at least i did when i tried them. I had a sxs head on mine too, maybe that changed my requirements slightly.

the 300 even in stock trim can often benefit from a larger pilot jet, 38 worked good for me. with the stock 35 you just couldn't get rid of the off idle lean bog, with a 38 the A/S was back in a tuneable range.

I say stick with at least a 162 if not even your 165. the size of you main jet only plays a small part of the amount fuel your bike wil get throughout the 1/8 - 7/8 open throttle range. when you are full open on the main your bike can use the extra fuel anyway, it helps prolong engine life and will help it run slightly cooler. most your jetting success will be from needle choice and clip position.

[Aries86]

The biggest problem with a new KTM 2 stroke is you no longer have any excuses when it comes to bike. I just put it on cruise control and let the bike finish the race. It even beat me back to the truck in ormand beach.