I've been playing around with a Perry carb. This is on a twice-crashed Thunder Tiger Pro-46 (last crash sheared off the needle valve housing). I can't believe the range this carb has in the rich region. I swear I can ritchen it up until it looks like a little toilet flushing at full throttle, four-stroking and slobbering, and it still runs the engine!!! The idle settings are a little finiky ("a few thousandth of an inch") but once set it's hands off thereafter. Now why can't engine makers use this system? (I guess Fox come with Perrys, or maybe it was another brand?).

I have my little TT46 pushing a 11X5 prop at 13,600 rpm (I richen it to 13,300 by my little tach) with 10% nitro.

Anyway, it may be worth a try swapping out the carbs on these lemons for a Perry. They come in dozens of sizes. I would hesitate to throw good money after bad but hey, this is R/C and that's the nature of the sport. They cost around $40