Rog,

Follow Tony's advice!!! I don't know anything about that motor but
at 85 hp you must have more than one carb, and not only do they need to
be sync'd when properely adjusted, they NEED to be giving you the fuel
flow. 2 strokes can't really handle a lack of fuel without trashing
the engine! I got a GREAT deal on a set of carbs for my motor off of
ebay last year. As soon as I pulled apart the lower carb of the pair,
I knew what happened to the engine it came from. The lower carb had
the float adjusted at a 45 degrees instead of at the normal 'level'
In this case I'm sure the lower cylinder burned up since there was
never enough fuel going through that carb. If you're handy, you can
rebuild them yourself, that is, if they need to be rebuilt, and you can
disassemble and clean them up if not. Oh, and if you don't already
have a service manual for that motor, get one. Some say they are
worth their weight in gold. Sometimes I think they're worth a lot
more than that!

The poor accelleration could really could be as simple as gummed up
carbs from the motor sitting too long if you don't know it's history.
Or could be a bad backyard mechanic. Either way, definitly check it
out.

-Jim