Do all 2 stroke engines run bad in the cold?

Question

My moped has been acting weird latley. It recently drop down to the mid 20's from 60 last week. Do you know why 2 stroke engines sputter and misfire in the cold. Do you know of ways to make it stop and run better.

Answer 1

In a nutshell, you need to correct your carb jetting, and your compression numbers.

Cold air has more density than hot air. So while the weather is cold, your air charge is 'thicker' and leaning out your fuel mixture. You need to fatten it up some.

While your at it though, I'd run a compression check on the engine and see if it falls within specs. Those little engines wear out at an alarming rate and you could be due for a set of rings or a rebuild.

Answer 2

No. Snowmobiles have been using 2 stroke engines since they started making them in the early 60's.

2 stroke engines react more to changes in weather and need to have their carburetors setup accordingly.

The old Mercury snowmobiles with the Thunderbolt ignition were advertised to start on the first pull.

Answer 3

A moped is most likely not tuned for cold weather, now I've had snomobiles that start in - 30 weather with a pull or two, and they DO RUN!!!!

Answer 4

like the other guy said sleds really rip at -30, that thing is designed to operate in 120 f weather. something metal to block some , not all , of the air that passes the motor may help, good luck ,dress warm.

Answer 5

2stroke motors should run better in the cold especially free air,there maybe a carburator slide adjustment that you can change.

Answer 6

Most do until they are warmed up, unless they are brand New.

Answer 7

yes