I'm currently finishing a 1983 KZ750 L3 that I want to sell but it does not run correctly yet. During the restoration process, I took the carbs apart, cleaned them (ultrasonic cleaner), cleaned also the MJ and PJ. Three weeks ago, I posted the following on FB:
1983 KZ750L3
Engine turns but exhaust pipe #4 is about half the heat of the 3 others. And by the sound, something’s missing for the engine to purr.
Also, revs sticks and engine hesitate when throttle is turned from idle.
Suggestions please.
Following the comments written, I took the carbs out again (they are OK) and adjusted the valves. #4 intake was quite tight and #1 intake a bit tight. They all now are within specs. I also put some RTV sealant between cylinderhead and carbs adaptors. Now that everything is assembled back (had to wait for valve cover to arrive), the engine started pretty well and seem to idle and respond OK to throttle input.
I let the engine idle for about 15 minutes. I was to the point that I intended to put my helmet for a short test ride around the house when I got some problem again. Now, I can't get the engine to start correctly. It does start but only on full choke and seem to be running on 2 cylinders. I replaced the spark plugs and checked for spark on the 4 plugs (there is).
While the engine was idling, I was earing something like an air intake. I sprayed some brake cleaner on the carbs (at the cylinderhead to carbs rubber boots) and the idle raised immediately. I torqued tighter still the clamps on the carbs but nothing changed.
Well, that's about all for now. Engine do not start correctly and I'm about to throw some lighted matches in the fuel tank...
Any guru here can help me please??
Many thanks!!