Theses are great little engines

SOund like it need some tlc

Your gonna need to pull the carb and clean it. usually I'd say rtv it when you put it back together but I've never had to do that with an OS.

change the glow plug and cheack the fuel tubing and tank.

With the glow igniter off and throttle wide open. hold your finger over the exuast and flip the prop. After 4-5 your should see fuel pumped to the carb.


Set the low screw so the head is even with the outside of the carb body, then screw it in a full turn. set the high end. Screw it all the way in then unscrew it richen it 2 1/2 full turns. It should run at that setting. set the radio for a high idle and move the stick up 4-5 clicks. add the igniter and start it. It should run. if not lean the high end a half turn. if it winds up, runs for a sec and dies richen the high end a half turn

go the full throttle and lean the high end screw until it peaks in rpm then richen it until you hear a slight rpm drop. drop it to idle. it may die just restart it at a higher rpm. pitch the fuel line. It sould run for 5 sec and die. If it speed up and dies it rich. lean out the low end. if it just dies it's lean. richen the low end.


reset the high end. reset the low end. let it idle about 30 sec and go to full throttle. it shouldn't hesitate. if it hesitates lean the low end. if it dies richen it

do this 3-4 times.