reply to post by GENERAL EYES
Used two stroke 50cc - previous owner may have used ethanol gas, but I can't confirm this.
Bike has a hard start, and will not keep a steady idle. Usually dies if gas is let up on.
We've tried adjusting the oil/gas and air ratios to spec to no avail.
Ahhh the lovely 2stroke motor.
My suggestions are pretty simple, seeing as it's only 50cc's and that's small.
Anytime you run a two-stroke motor, the exhaust will have a blueish tinge.
That's the oil/gas mixture burning, no big deal.
But it should only be a slight smoke, not lasting...and if you had new rings installed, not much at all.
My problem is that you spent $400 at a dealer when you could've found a used motor for that much!
If you have a service manual, great but a Clymer or Hynes will be best.
Ok so this is what I'd do...
Idle is controlled by a screw and a combo of the throttle passages in the carb.
Since I am not familiar with that particular engine, I would do the basics.
Tear the carb apart and clean/thoroughly check all passages and possibly install a rebuild-kit.
A clogged port or needle that isnt sitting properly will cause problems...
Check the intake boot for cracks and replace if found.
They are cheap, and if you can name the carb and it's size...easy to find parts.
By name I mean....Mikuni 28mm...etc.
Next best thing....youtube.
I get alot of info on motors I am unfamiliar with from there.
edit on 31-5-2012 by havok because: Clarity