Originally Posted by klx678

Works with a two stroke running about 3-4 ounces of oil in the gas burned. Four shot glasses full. That little bit of oil won't hurt anything.

There can be only two sources, the air filter oil and the breather. As long as you haven't overfilled the crank case the breather wouldn't be a big deal either. Make sure you have the right amount of oil in the engine. I believe you are to check the oil in the view window with the bike sitting upright, not on the side stand. If you filled it up leaning on the side stand you have too much oil and it is blowing into the air box. If the oil in the carb mouth is gooey sticky it is from the filter if it is dark and slippery, but not sticky it is crank case oil See if you overfilled the crank case.

Originally Posted by peabrain

i think mine is using to much oil........using a bottle a week on 2 tanks of gas

Originally Posted by klxster

you don't really have to use 32:1 , the klx will run just fine on less oil - 50:1 is ok..

Originally Posted by klx678

Fix it by downshifting. You are running too low of rpm if you are getting knock when under load. THat engine doesn't start putting out decent power without lugging until around 5000 rpm, lighter load maybe 4000. I run a stock 250 with the MCM, jstted with 87 octane and have never heard any detonation or pinging. But I don't run the engine like it is a tractor. I let it sing.

Originally Posted by bgcameron

Hey horror-fan, I've heard a noise similar to the one in the video you posted. It turned out to be the little black fender in front of the rear tire. It sometimes rattles against the swingarm with the suspension compressed, which I could see happening under load and going up a hill.