I could not resist, I broke down and bought a Mecoa Conversion Head for the 40FP ($22.00). It is a nice pretty blue head and is simple in construction and design.

Scrounged up an old gallon can of Davis Diesel at the LHS. It had been there so long that the owner just gave it to me for free as long as I would give him a report on how the conversion ran.

Installed the head, mounted the engine on the test stand and installed a 12-6 prop. Left off the muffler so I could prime and tweak the compression screw. Started the screw at the lowest setting and gradually started sneaking it down and flipping the prop until in started to pop. Hooked up the fuel line and applied the electric starter. Boom, it started right away. It was undercompressed (Blaa, burp, blaa, burp), so I tweaked the screw down until it evened out. Adjusted the needle for a smooth run and then checked the RPM. That thing was turning a 12-6 APC prop at 9030 RPM. I considered that excellent. It turns a 10-6 at 11900 RPM. Wow!!

Now, I have been reading all the post in this forum and was somewhat intimidated by diesels, but not any more. Just start undercompressed and sneak up on the ingnition point was all that I had to do to get mine running.

I can't wait to put this thing on a plane. I have a Kyosho BF-109 that I think I will try it on.

AJ, expect a couple of heads in the mail soon, a Tower Hobbies 75 and 46. I am hooked!!!