So can anyone tell me the correct procedure of putting that lever back on
OK, I am assuming you pulled out the vertical throttle rod/linkage, correct? Probably to access the exhaust cover. If so, I don’t know how that could have gotten messed up during reassembly, it only fits in one way. There is a plastic pin that fits into the gear on the bottom of the vertical throttle lever, did that get broken/snapped? The gears could not have gotten misaligned unless you pulled out the horizontal throttle rod, but you would have had to remove the set screw on the end of the gear to do that….
Maybe if you post some pictures we can see what is going on..
Finally, that engine absolutely requires a 16:1 fuel/oil mix, regardless of all the hype about today’s oils being superior to what was available back in the day. Continuing to run the engine at 24:1 will probably end up with a rod through the crankcase.
So as you can see the gear on the tiller part only runs part of the way around it’s almost like the smooth part needs to face inside because as the teeth roll against each other it finally hits the smooth part which in turn won’t move the arm any further on the throttle and that small black rubber piece ends up quite shy of full throttle
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