ORIGINAL: Jeff_edge540
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).
I think your problem is the pump not inverted. I used to have this problem with an upright engine and the VP-30 pump. I usually am very careful about turning the engine over because the pump is pumping fuel each and evey time you turn it over. So no need to choke the carb, just open it wide open and turn the prop over several times, then I close the throttle and flip start it. If it doesn't start I clamp the line with the hemistat and start with the starter motor, then I ususally have enough time to unclamp the hemistat before the engine quits. However, you use a VP-20 which will not pump till the engine starts so you should still choke or prime the engine. Also you need to run the fuel out at the end of the day, store the engine upright, or remove the glow plut and put some tissue or cloth in the glow plug hole when in storage.