Hello everyone.
I am trying to learn as I go but believe the quad for my niece is a 50cc 2-stroke 1DE41QMB. I was orig convinced it was a QMB139 4 stroke since there isn't an 2cycle oil reservoir. I have no idea it's age but have had it fire briefly after replacing a 4 pin rectifier. Pulled carb down and searching for a kit orexact replacement has me convinced it's 2 stroke. Anyone had experience with these? If it 2 stroke is it 40:1 50:1? Idle air was out 6-1/2 turns but I'm sure that wrong. Any help greatly appreciated

 

If it is a two stroke there will not be a cover on the cylinder head for rockers or cam. Often the plug hole is in the middle of the head fins. Also the manifolds will be on the side of the cylinder rather than the head, the inlet manifold may even be on the crankcase. The Linmax copy of the Suzuki LT50 didn't have an oil resovoir but a sticker saying 32 to 1 mix for fuel to oil, so I would go with that if you think it is a two stroke. Too much (within reason) is better than not enough oil.