lonestarmedic
Well-Known Member
Ok, I am ready to bury my bike with a backhoe!! It started running like the idle jets were plugged up. Erratic and low vacuum readings on the Morgan Carbtune. So sinc the carbs had never been off I decided to do a rebuild. Pulled carbs and used an ultrasonic cleaner on them. While cleaning I re-shimmed the valves. They were a little tight but not unusual for 30 years old. Replaced all carb gaskets. Replaced the cut off valves on the side of the carbs. Installed new rubber plugs in the jet block. Along with the usual O-rings. Main diaphragms are almost new. Replaced them a couple years ago. Started bike and it idled fantastic for not being synched. However it will not rev at all. Any throttle will cause a stall. And the carbtune registers no movement. It is all the way at the bottom!! Now, if I use the choke, it will rev up like the throttle was twisted open. I tried adjusting the idle mixture to no avail. Carbs are on square in the boots. Airbox is on tight. Something is drastically amiss here. All 4 cylinders have spark. Tomorrow I am going to check the compression, and install new spark plugs, and check for vacuum leaks. Bike ran great until a 5 month storage where I was unable to ride. Very frustrated at this point.
Lack of vacuum points towards either a massive leak or worn out motor. It has 80,000 miles.
Choke causing revving engine points to a lean condition. However idle mixture has no effect.
With no vacuum, I cannot adjust the synch even though I know it has to be way off due to removing screws and springs.
Any ideas will be considered.
JB
Floresville, Texas
Lack of vacuum points towards either a massive leak or worn out motor. It has 80,000 miles.
Choke causing revving engine points to a lean condition. However idle mixture has no effect.
With no vacuum, I cannot adjust the synch even though I know it has to be way off due to removing screws and springs.
Any ideas will be considered.
JB
Floresville, Texas