rough/Vibrating engine

[lgould]

Sounds serious.

watching the engine accelerate in neutral, the shake occurs in the low to mid range almost as if the spark is before top dead center and causes the engine to shake. Is that even possible.

[Mike Mac]

I only have experience with one car, but what you are explaining may be normal, because my motor does the same thing. And its been doing it for a year and a half, and about 1300 Mi. Still runs strong, no knocks or noises.

[smallblock450sl]

Originally Posted by lgould

I have a G9-A that has a significant roughness on acceleration the point the steering shaft and seat shake, this happens at 1/4 to 3/4 throttle and smooths out somewhat there after. I have looked through the forums and have checked the following:
Motor mounts - Good condition.
Carburetor - removed and cleaned all jets and airways.
New drive belt and greased clutch and sheave.
Checked valve clearance - .004, good.
new air and fuel filter.
Adjusted tensioner, Slight play fore and aft.
New BR4ES spark plug set to .030
Removed starter belt and engaged , runs smooth.

Just purchased the cart from an estate so no history but i suspect it was not abused.

Something internal, spark delivery timing? Could use some insight.........

Removed the starter belt and runs smooth, can elaberate?

[lgould]

Starter spins smooth, thought perhaps the vibration originated with starter bearings, not so. Think I have eliminated all obvious possibilities, will have to live with the scenario or dispose of the cart.

Thanks everybody for your input

Larry.