KDXRIDER.NET

I'm using Yamaha 2-stroke Racing oil at 32:1 ratio, and I do not have any plug foul problem. Dansmc dot com says this about Japan two stroke oil injection system:

At an idle the pump mixes the oil with the gas from a 120 to 1 ratio on up to 20 to 1 ratio at 8000 or more RPM.

So that got me thinking that I might want to use more oil for extended highway cruising for the sake of engine well being. Would it be advisable to rejet the carb to, say, 25:1 ratio for dualsport type of riding? I just rebuild the top end and spent a bunch of money on other parts too. So I'd like to take care of this bike and last a long time. This is NOT a beater. Can't afford to kill it and buy another engine.

i would stick with the 32.1 & just go up 1 tooth on the front sprocket or down 3-4 teeth on the rear if your doing alot of hi-way miles...this gearing should lower the rpm a bit & help with cruising speeds & ecconomy.

I run 40:1 and I have just over 600 highway miles on my plated KDX 220 but my gearing is 14/45.

30:1 and you'll probably never seize the motor. but 32:1 is good enough