I simply bought a fairly pristine 2015 KTM 300 XCW from a dealer. Together I left the company dept after ~ prep, the organization manager said me the it had actually gas through an oil ratio of 32:1. He said to move to 60:1. Thing is, it runs pretty great with the 32:1, and knowing sufficient to recognize that 60:1 will certainly make that run rather a bit richer (less oil = much more gas to the exact same amount of incoming wait = richer) and also the fact we are going into summer, would certainly you execute this?

From love my 300 in Idaho!

You know, you have to be among the elite amongst our bevy of readers. Not only have you realized my superior intellectual power native the start, but likewise you have basically reply your very own question. I will certainly however, sophisticated for the others.

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In the human being of two stroke jetting, other than the really brass jets themselves, there space three other factors, external of deteriorating engine condition, that contribute to the in its entirety jetting the the bike. And by jetting, we average if the bicycle is running affluent or lean. The three components are waiting temperature; elevation and also the proportion of fuel to oil you select to run.

 You can’t regulate the waiting temp or elevation, however you can control the fuel – oil ratio and also the jet size. Before we start with the others, let’s clear up, when again that greater elevation amounts to less air and also therefore the bike runs richer. Higher temps also mean much less air (thinner), so again it runs richer.


 Personally, and also I think various other really intelligent people agree that it provides sense to mix a gallon that gas at say 20:1, 32:1 and also 40:1 and test it and see i m sorry blend renders you bike run better. It’s an easy means to validate which way targets your style of speak and enables for easy alters when friend head increase to higher elevation and also don’t want to rejet. One thing to lug up is the at greater elevations and temps that summer seems to bring, you might not be able to get a small enough pilot jet in the 300 to run well at 60:1, since the pilot jets room close to the finish of the available range.


 Next, it’s jet time. Most world know, that you deserve to remove the peak cap with the slide and also be maybe to rotate the carb sufficient to obtain to the jet without acquisition the carb off. The hexagonal one on the best is the key jet, which controls fuel at mostly mid-wide open up throttle. The middle one is the jet pilot, i beg your pardon controls fuel in ~ the low throttle openings, and the one ~ above the left is a unique jet for fuel regulate at the starting of the bike. It’s brand-new over the years and is one of the reasons KTM’s begin easily. That shouldn’t should be changed.


 Next you have the slide and also needle, v the clip in the collection of grooves. Moving the clip up or under is the many common readjust people make, making the bike run richer or leaner from around 1/4 throttle to 3/4 throttle. Moving the clip up makes the bicycle leaner and also down provides it richer.

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 And lastly, don’t forget that 2 strokes have an air adjustment screw, uncovered on the airbox next of the slide. Turning it out renders the bicycle leaner simply off idle and also in makes it richer. That an easy method to dial in an answer at yes, really low accelerator openings.

 And that’s it. You were on the ideal track with your thinking. If an altering the amount of oil renders you bike operation better, climate you can get in there and readjust the jets, to obtain the bike perfect with the air-fuel ratio you may want to run.