Got a mini chopper bike, with like a weed-eater engine on it. The guy I bought it from gave us some oil to use with it we ran out of it, and now mixed in some mobil one, 2 stroke oil. Cant you use any 2 stroke oil on any 2 stroke engine? Would that be why its not starting? The bike has sat for a couple of weeks, I got it to start for a couple of seconds but now it wont.

Yes, you should be able to use any 2 stroke oil, butt..... if you have to mix it in the gas your self, they all have a correct ratios and that varies widely. Check the ratio. What makes you think the oil change is causing the no start issue? Did you look at the plug?

If the ones I saw yesterday at Autozone are like what you are talking about, they are cute little buggers!!

Looks like you can put one under each arm and walk off with a pair of them.....

He, He!! Bet the Cali. guy's can't buy the smokin' little two stroke suckers.....

I highly recommend running her completely dry before you shut her down each time to keep gas/oil fowling to a min. everytime you go to crank her up a couple a weeks later..

pdq67

I bought two of those things for my son (but he can only ride one at a time, guess who the other one's for) They really are a blast and yes, we're in cali, just have to be real careful where you ride them. After ours set for a week or two, they do take a little longer to start, but they start up after 8-10 pulls. I mix ours with any typical 2 stroke oil, it recommends breaking them in with a couple tanks of 25 to 1, then leaning the oil out to 50 to 1. The only problem i've had with ours, is the needle/seat assembly getting dirt inside, so after cleaning them out a couple times, i added fuel filter to both and no problems since. Got the fuel filters from a local lawnmower shop. I would check the plug/wire and possible fuel lines/needle and seat. good luck and have fun. Brad.

Most oils yes. Except switching from Castor to Synthetic is not recommended. Castor is the good smelling stuff if your into that.
After a number of tanks, best not to go from conventional to synthetic either. Some brands can knock the carbon build up off. Also, A long time ago at least, Belray had some compatability problems I heard about. So safetest was to always run Belray brand or not. The synthetic oils burn cleaner, produce less carbon and reduce wear.
Never heard of any conventional oil being rec. for a 50:1 ratio. Only synthetics. Note, going to 50:1 will richen the mixture a little. So if it starts fouling plugs... Or it came jetted lean.
From lots of people and my own experience, YamalubeR @ 32-1 or GoldenSpectro @50-1.
This is from higher HP per cc motor experience.
Only thing I worry about is carbon build up from the cheaper oils. Never tested one to find out though.

I may be just getting into 4 stroke tuning, but 2 strokes are a different story. I used to tune my 2 stroke engines to burn clean in the chamber, that means I had no hard carbon buildup. Looking down the plug hole on a properly tuned 2 stroke you'll see 2/3 of the aluminum in the center of the piston, and a band of soft carbon around the edge except where the transfer ports come in. The only carbon buildup was in the exhaust port and head pipe. After switching to 100:1 and rejetting, the band around the piston looks a tiny bit lighter and the exhaust is clean. MORE POWER, cheaper, and less noticable wear. If you wish to stick with castor oil, run 40:1. If you are properly tuned you WON"T foul a plug. Assuming you have compression, spark and no dirt in your carb, I'd suggest taking out the plug and turning it over a few times. Look to see if gas is coming out of the hole. If there is, your needle and seat need replaced. Keep turning it over in this manner untill you see no more fuel coming out of the hole, put the plug back in(if dry), and give it a try. Good luck.