I mounted an OS .91 2-stroke on a Fliton Inspire 60 (great plane btw). The fuel take is over the CG so I decided to use the Perry VP-20 ossicilating pump to help with draw. The tank is low in the fuse. Once I get the engine running and heated up it runs great - but starting it at the beginning of the day is a real chore.

I start out by removing the glow plug (oil settles on the heat because I store the plane on its landing gear -engine inverted) and blowing out/off the oil. Then I put the starter on the plane and give it about a 5sec turnover to clean out any fuel/oil in the cyclinder. Then I replace the plug and fuel it up.

I give the prop a couple of hand flips with the throttle open to prime it, attach the igniter and start turning it over with the starter. It doesn't want to fire after several 10 sec tries. I usually have to remove the plug and dry it out and re-install.

Once I get it to fire (if I can get it to fire), it won't throttle up without dying (like it is too lean). However, it will start much easier from this point on.
Once I can get it to full throttle for a few seconds it will run perfectly in the air and on the ground.

If I let the plane set and completely cool off then I run into the same headache as before.

I'm not sure if this is typical for inverted engines or is the VP20 adding to the complications. Either way, I'm thinking about buying a Cline reg and taping the crank case.

Can someone please advise on my situation? Thanks.

BTW: the Perry VP-20 is mounted on the bottom of the crank case bolts. So the pump is 2 - 3 inches above the carb (this was the only way it would fit).