On my xcell, the 8 year old OS61 Not Wc, is behaving
badly.
Guy one, b4 me had 10 flights on her.
Sold it to me last summer.
I have tried and tried to get this engine running right,
but it runs hot and nasty at way to lean. (Only way
I have found to get power.) My bud busted my chops
for having so little smoke trail and tried to help.
But all I get is a 'SURGE' type situation.
3 needle carb, 30% nitro shoving 680's on the Sport
Trainer also 8 years of age, but low flight time.

The muff pressure tap is AT THE beginning of the
mainifold header right where it leave the cylinder B4
the silcone coupler up to the xcell minipipe.

At 3/4 stick and the hover, the engine surges and ups
and downs revs, will not develope much power and
I just can't seem to correct it with either needle!

Can anyone help me find this problem?
Byron