Hey guys, I got out yesterday and flew my 50cc yak that has a DL50 on it for the first time since the weather has really changed here. The last time I had it up it was about 72 outside. That day I leaned the top end a little to get it to stop popping, I'm still breaking in the engine, has about 1 1/2 gallons through it. Well, yesterday it was about 45 outside and the plane dead sticked. I had to richen the top end about a 1/2 turn, and the low about a 1/4 turn and then it ran geat. Do most engines lean out in the cold? or maybe did I lean it out to much the last time I flew it?
Thanks, James

In the warm, lean out
In the cold, richen it up again.
Cold air is denser (more oxigen weight for the cubic foot), so needs more gas in order to get the mixture right again.

James, I open my high speed nedle valve 1/8 turn in the morning when the temperature is in the 40s and start closing it as the temperature makes its way into the 70s. Every engine requires that. If someone isn't doing it because he says his engines never need adjustment he probably has it set too lean. Dan.

It seems like this would be wrong but it is right.

Oh it is definitely correct, and if one checks accurately, you will see an increase in power on the cold days once the mixture is optimized.

AV8TOR

once I had it tuned it seemed liked it had more power.