All 2st New CR125 or WR250 for a novice woods rider?

[Boosted Josh]

There is an idle screw on the side of your carb that has an eight mm locknut on it. Crack that lock nut and you can adjust your idle. Better yet, get a Stealth Technologies spring loaded idle screw and throw the stock one away.

Good deal, thanks for the pic.

40:1 is fine if you use good oil. You can't get a true assessment on jetting until you find the mix ratio you want to use. Run ALL of the break-in premix through the bike, then put in 40:1 and evaluate the jetting from there, and take note of the temperature. I will say that I run 32:1 and have never had any issues one way or another (knock on wood).

I should add that I've never ridden a 2 stroke that ran smoothly from bottom the whole way to top. There's always a sputter right before the 'power band'. That's because the power valves are opening. It's common, don't confuse it with jetting issues.

Sounds like a plan 40:1 after this first tank

I probably wouldn't mess with jetting until you have the tank full of gas that you will normally use mixed with the oil that you will normally use at the ratio you will normally use. That being said I went to a lectron because im jetting handicapped and don't want to deal with it! When you get to the point where you've got the mix you will be running there is a carb database on here with all kinds of settings that have worked for people that might help your jetting if it indeed needs it after the first tank is ran through.

As far as ratio the factory recommends 40:1. I personally run 44:1 because my bike runs better and I don't have any spooge but I use a good full synthetic oil as well. I have a friend who has 11,000 miles on his kdx original piston and only ever used the very cheapest Walmart oil, you will never see me use it but most synthetic oil these days is fairly good. I'd recommend finding a good mototcycle specific oil that you can always get someplace local if you need some in a pinch. I use Klotz R3 some people love it some hate it and you will find that with most peoples opinion on oil so I'd find something that makes you feel confident and go with it.

I picked up some redline oil I figured it was a good quality oil.

I run maxima 927 castor oil in my lawn equipment only because I like the smell lol.

 

[juicypips]

whats the manual spec say on premix? yup run 40:1 an go from there, i use 50:1 but thats on my 350 did use 82;1 on my 125 kmx but i hated that bike and it wouldnt die... i miss it now its gone tho.
look after it an should last you a good while.

 

[JRod4928]

I've run Maxima 927 my whole life in all my bikes. Your lawn equipment should run forever if you're using that stuff, lol.

 

[Kyle Tarry]

Your bike should idle, even with the slightly-more-oily break-in premix ratio. Try adjusting the idle screw, but it may also be related to the jetting. I don't know how the 125s come from the factory, but look at the jetting database here (stickied in the 2-stroke forum). I'd say the same thing about the bog, a properly setup 2-stroke should run cleanly through the range. However, I'd get the first tank of gas through it and get the mix ratio right before you go chasing after something.

Note for 2-stroke new guy: Sometimes you get a "burble" or stumble at super light throttle on a 2-stroke, my 300 does it just a tiny hair off idle, like if I'm going down a dirt road at very light throttle. This is normal, and it never happens when you're riding on the trail. It doesn't sound like this is your issue, though.

40:1 is fine. There is a whole thread on here somewhere about premix ratio and what oil to use, lots of opinions. Maxima 927 will treat you fine.