Hi

I recently bought a new JEN .91 two stroke engine. It has been well run in and has been powering my sports plane for about a dozen flights. The only problem is that it will not stop without pinching the fuel line, even when the carb is fully closed.

Any ideas?

Thanks

Sorry never heard of JEN engines but do check your carburator. Does it have an idle stop screw that limits the barrel closure. Many times engines with this type of carb come with the screw set so the barrel does not quite close or does just not close enough.

If it has a stop screw just turn it out a turn or so and see if the barrel wil close some more.

John

It's probably sucking air either at the needle valve O-ring or at the carb base.

If this is the problem how do I sort it?

change the o ring at the needle valve or the carb base