Buggies Gone Wild Golf Cart Forum - View Single Post - 18hp Cushman Haulster ('77)

slonomo · 08-09-2021, 08:08 PM

A few questions:
1. 18hp? Is this a Cushman engine?
2. Carb? Is that the original factory carb? You say Keihin, but does it actually say "Keihin"?
3. Fuel pump? Why not use the factory vacuum pulse pump?

If the carb is an aftermarket unit, that could be your issue with the stumbling and rough running. I've seen my fair share of both factory and aftermarket carbs and I can say that 100% of all good condition factory carbs will vastly out perform a cheap knockoff carb. With that said, I have had some knockoffs that ran fairly well. But I will always default to a factory carb, in your case, the high quality of a Keihin made carb.

Sounds like you've looked in all the right places. The reason I ask about the engine type is there could be something specific about that engine you might need to look at. For example, Briggs engines like to have the valves set a little fat, and they don't like big carbs. So maybe there is something about that engine that needs looked at. Did you check the valve lash, compression, or do a leakdown test?

08-09-2021, 08:08 PM	#2
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,441	Re: 18hp Cushman Haulster ('77) - rough runner A few questions: 1. 18hp? Is this a Cushman engine? 2. Carb? Is that the original factory carb? You say Keihin, but does it actually say "Keihin"? 3. Fuel pump? Why not use the factory vacuum pulse pump? If the carb is an aftermarket unit, that could be your issue with the stumbling and rough running. I've seen my fair share of both factory and aftermarket carbs and I can say that 100% of all good condition factory carbs will vastly out perform a cheap knockoff carb. With that said, I have had some knockoffs that ran fairly well. But I will always default to a factory carb, in your case, the high quality of a Keihin made carb. Sounds like you've looked in all the right places. The reason I ask about the engine type is there could be something specific about that engine you might need to look at. For example, Briggs engines like to have the valves set a little fat, and they don't like big carbs. So maybe there is something about that engine that needs looked at. Did you check the valve lash, compression, or do a leakdown test?