Heres my story of all events that have taken place during my troublesome adventure with this engine.

Out of the box this engine was doing the same thing that everyone else has described. What was done to solve this problem was change out the muffler with a Magnum, replace the needle valve and fine tune both needle valve settings. This engine is a very picky engine, the slightest debris will cause a fluctuation in the rpm. After a few days I was able to get the engine running as it should and placed it on my WM SS60 which flew and ran great. I then moved the engine to its final destination which it was intended for (GP Shoestring). Since it went from open air to a cowl along with a pits muffler it started doing the very same thing it did when it was new out of the box. 10 in the air lean, power down.

I pulled the engine off and sent it into HS to have it serviced. I just got the engine back with the following replaced parts, piston, piston ring, cyl liner, cover plate assy and rear bearing. No where in this invoice did it list the cause of the lean run, nore did they replace anything that had to do with the fuel system. I wrote them back via email stating this and am now waiting for there reply.

Am I destined to place a pump on this engine in order to solve all issues? If so then I would have to shame OS.


Blackie