Say Jeffedge540 - The topic of your forum caught my attention as I use the Perry Pump on my two-strokes but it is a different model than what you are using. I'm sitting looking at the directions that came with the pump that I'm installing in my new CMP Yak 54-140 with an OS 160 and it's a different model than you are using. Mine (and the other two that I have installed on a 61 and 76 GMS 2-stroke) is a diffenent model number. Mine are all VP-30 models (blue for glow 2-stroke) and they are not ossicilating pumps, but diaphragm pumps that operate from crankcase pressure. I thought the ossicilating pumps were for 4 stroke engines??? I may be wrong, but that is also what I have read and been told by my local hobby shop. All of mine are VP-30 models and are blue and work very, very well.

Also, I flew C/L for a while several years back with engines (although they did not have a throttle) that were inverted without a problem, and most recently a Seagull PC-9 with an Irvine 51 (no pump) that was inverted. I had a problem initially until I figured out (with the help of a friend) that the tank was mounted about half-an-inch too high. I lowered the tank, leaned the low-speed needle, and the engine ran like a dream. The engine was always started in the inverted position, and never loaded up after I re-positioned the tank.

I'm of the opinion that you have the wrong pump for a two-stroke engine, but I've been wrong before!!! LOL!

But by all means remember, "Experience is a hard teacher. She always gives the test first and the lesson sometime later!"

Phillip