[Ducati] NDC- possible carb issues with CCM? Help please

[Garth Williams]

Good morning listers,

I've been having issues with my CCM supermoto lately and am asking for the
advice of the list.  This CCM uses a 604cc Rotax motor with a single
dell'orto carb (at least I think that's what it is).  In trying to diagnose
and solve other problems, I've replaced the coil, wire and plug.  I've also
had the carb out several times.  The issue now is this:  in lower gears, the
motor runs fine.  However, when you go full throttle (or near it) in higher
gears, where you have a long time in the gear, the engine "bucks" like it's
either starved for fuel or spark.

On Sunday, I fiddled with the air-fuel screw, going both in and out in 1/2
turn increments.  There was no real change in the condition.  I've also
swapped the old coil back in place to no avail.

I'm thinking there's not enough fuel in the float bowl and it's starving.
Any other hypotheses?


Thanks,


Garth