For those waiting for the MG66 I can say it's worth it

I have now about 1 1/4gallons through the engine and it's starting to open up (not that it was dull in the first place) I run it in with MM run in oil on the first 5 tanks, then gradually leaning out. It still had the break in shimm in place but I plan to remove it b/f tomorrows race. Also I started with OS P3 for break-in to ease the idle etc. but I dropped to Hobbytech T6 (about OS P4) and it worked better.

What I've noticed is that this seems to be easier to tune than the hand modified MG66. Engine is very nice to drive and linear. Powerdelivery is smoother than Stage5 5pt and overall it has more power. TO me it's definitely a buggy engine and for truggy you use either standard 5pt or the Stage5.
With still rich settings (after clutch issues and no time to retune) I was pitting 8min 30s with 1/5 tank fuel still left so with 7mm restrictor I assume it will soon reach the 10min mark when it's settled.

Setup:

MG66
Hobbytech T6 plug (P4)
GO 2072 pipe
Byron Race2500 ProDriver
M2C 4shoe clutch, reg-medium shoes, 2x yellow + 2x black springs
Standard shimming
8mm restrictor