im re-posting this here because the motor that i have is a morini clone. maybe some of you italophyles can help me 
I am running a ktm-50 motor it is the same as a morini in many ways and is now replacing ithe italian motor in the ktm dirtbikes.
It has a centrifugal clutch and no sprag catch so it should freewheel when the wheel rpm exceeds the motor drive.
THe clutch begins engaging @ 4k rpm. The motor redlines @10.5k
The 19mm dellorto carb designed specifically for this motor, is adjusted fine and jetted properly.
I am using the proper gas octane and oil ratio.
I have an expansion chamber and a muffler...motor seems to have no trouble getting "on the pipe"
The problem is this:
when the bike is not moving, the idle is fine...about 2k rpm
the problem comes when i get up to speed and try to coast; when I back off on the throttle and let the clutch freewheel, the motor dies.
but this only happens when Im moving. When im moving at 20 mph, the only way i can keep the motor running is to keep the throttle revving. . The clutch does not seem to have to be driving the wheels and is at least partially if not fully disengaged
When the motor dies,
it does so all at once...no sputtering...just dies like the kill switch was hit (i checked the wires, theyre fine too)
When this happens, I can also confirm that the clutch freewheels because although the motor is not running, the tire keeps spinning without resistance.
I can restart it without a problem. Its not seized. It just dies.
aaaaagh!
I am running a ktm-50 motor it is the same as a morini in many ways and is now replacing ithe italian motor in the ktm dirtbikes.
It has a centrifugal clutch and no sprag catch so it should freewheel when the wheel rpm exceeds the motor drive.
THe clutch begins engaging @ 4k rpm. The motor redlines @10.5k
The 19mm dellorto carb designed specifically for this motor, is adjusted fine and jetted properly.
I am using the proper gas octane and oil ratio.
I have an expansion chamber and a muffler...motor seems to have no trouble getting "on the pipe"
The problem is this:
when the bike is not moving, the idle is fine...about 2k rpm
the problem comes when i get up to speed and try to coast; when I back off on the throttle and let the clutch freewheel, the motor dies.
but this only happens when Im moving. When im moving at 20 mph, the only way i can keep the motor running is to keep the throttle revving. . The clutch does not seem to have to be driving the wheels and is at least partially if not fully disengaged
When the motor dies,
it does so all at once...no sputtering...just dies like the kill switch was hit (i checked the wires, theyre fine too)
When this happens, I can also confirm that the clutch freewheels because although the motor is not running, the tire keeps spinning without resistance.
I can restart it without a problem. Its not seized. It just dies.
aaaaagh!
