I started flying giant scale planes about a year ago and use gas engines for them. In a sense I am new to gas engines eventhough I have been using glow engines for years.

I have a Fuji 50cc, 3W 60cc and a Zdz 60cc.

My problem is that I fly gas engines for a month and than my glow planes for a couple of months and than back to gas. What I find is that each time I store my gas planes for a month or two it would not start. Each time the problem is the carb is blocked and does not draw the fuel. I than have to dismental the carb and clean it before the engine will start.

This has happen may times to my Fuji and 3W engines. It seems that the old fuel left in the carb hardens and clogs the carb.

Is this correct? How do I avoid this happening? Is there "after run oil" that you can put in the carb, like we have with glow engines?

I know about tricks and tips to maintain and run my glow engines but I hope you all can give me tips on how to maintain and run gas engines. Thanks