Thanks for the info.. I have two La. 46's and they run well,, but not inverted. I tried inverted in my Nobler and never could get reliable idle/transition. Upright and horiz. they were ok. Don't know what is going on inverted. My guess is the small crankcase volume is allowing raw fuel to enter the combustion chamber and load it up.

I removed the La. 46 from the nobler and installed a new Saito .56.. It ran so well inverted that after 10 minutes I took it to the field. Great flying ever since. The reliablity issue is why I was looking to Saito.

Are the Robart retracts,, air operated or servo. Just wondering.. I haven't build a air retract system since the Super Kaos in 1973.

Thanks again.. Jim