I took my Z50AK4 outdoors today for the first time since September. I've done a complete top end overhaul. It's now running a CT70 cylinder, ATC70 head.
Still running on the original Z50 carb (barely), choke on, ok, mid choke poor, no choke = stall (no doubt carb is not large enough).
While running I found a few things:
Relatively difficult to turn over, is the CT70 Kicker a direct swap?
The exhaust needs more work (badly carboned up; smoke rolling out of it was insane! I thought the engine was coming apart! Removed exhaust to confirm. You're ideas to cure please)
There is a Squeaking sound in rhythm with engine rpm - The only time it's not present is while kickstarting, no air cleaner, throttle open, choke open? Thoughts?