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Old 04-10-2021, 02:08 PM   #1
Not Yet Wild
Join Date: Apr 2021
Posts: 1
Default Cushman 898452-8810 Keihin Carb Flooding


New cushman owner here hoping to get some guidance on a truckster a family friend purchased that I'm helping get running. It's a Truckster model 898452-8810 with the OMC opposed engine in it, can't figure out which engine though, 18 or 22HP. The stickers worn. Currently I've got the truck to fire and run but it floods out really bad. The current setup has the original mechanical fuel pump which I've replaced the lines, cleaned and flushed the tank and installed a new fuel cap (Missing) as well as a fuel filter. The truck had what looked like a brand new bypass filter which is my suspect of failure point. I have rebuilt the carb with a new kit, this has the Keihin carb on it, cleaned the points off so the 2 coils fire nicely into new plugs. For the heck of it, I had a spare snowblower tank that I ran direct to the carb prior to rebuilding the carb with a fuel shut off valve at half closed and it sat there and sang, anything else it has only stayed running for a short period of time. I'm very familiar with small engines and power equipment but honestly this one has me scratching my head! Hoping someone can point out something obvious I may have overlooked.

I did see a post somewhere else by a gentleman named "Charley" that mentioned setting up an electric fuel pump and doing away with the bypass filter and return line. My issue with that is I do not believe the carb will hold back even a couple psi fuel pressure coming at it.

Looking forward to what folks have for input, really want to get this thing moving! Enjoy your weekend!

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Old 04-11-2021, 09:24 AM   #2
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Join Date: Dec 2012
Location: Central North Carolina
Posts: 470
Default Re: Cushman 898452-8810 Keihin Carb Flooding

I do seem to be the "resident expert" on Cushman OMC engines.

If your OMC engine has the spark plugs below center in the cylinders, it is an 18 hp. If they are above center, it is a 22 hp engine. BTW the only significant difference between the two engines are the cylinders, the 22 hp being higher compression. The rest of the engine is the same. OMC also made a single cylinder version of this motor that was used in one model of Cushman Motor Scooter. Again, most of the parts in this engine are the same as the 2 cylinder engines. BTW, both cylinders are the same part number. Since both the intake and exhaust valves are the same, it doesn't matter which side of the engine it is used on. These cylinders seem to be the weakest part of these engines. The cylinder and head are one piece, similar to many motorcycle engines and not separate like the VW style air cooled engines. This makes working on the valves and valve seats in these engines very difficult as most valve repair equipment is not designed to reach in this far.
With the spark plug threads of aluminum, this is another source of failure in these OMC engines, so a little anti-seize on the spark plug threads is a good idea.

With the OEM fuel pump, it depends on excess fuel pressure being bypassed back to the tank. If the bypass filter has any problems, it may fail to do this and over pressure the float needle valve in the carburetor. A modern electric fuel pump is self regulating for fuel pressure, so you don't need the bypass filter and you can connect the electric fuel pump direct to the carburetor. The original fuel pumps for these engines is now almost unobtanium and if you do find one it is likely new old stock and 25 or more years old, with rubber parts that won't likely last very long once you begin using it. The price of these is incredibly high now if you can even find one, making new electric fuel pumps a real bargain by comparison. After installing an electric fuel pump in my Truckster, the engine ran better than it did when new. I made a metal cover and gasket for the old mechanical fuel pump location, removed the mechanical fuel pump and bypass filter, and rejoiced at how much better my engine ran.

If you didn't replace the carburetor float and needle valve in the Keihin carburetor, this could be the problem too. Old plastic floats tend to absorb fuel slowly over their life and not float as high in the fuel bowl after many years, causing the reserve fuel level in the bowl to be higher and sometimes even high enough to come out of the vent. In both cases, the the engine runs rich and floods out. Also, while working on your carburetor, look in the end of the fuel inlet pipe and if you find a tiny filter screen, remove and discard it using a pair of fine needle nose pliers. They are more trouble than they are worth, likely plugged up by now, and a good inline fuel filter will be the better alternative. You can't get these tiny filter screens any more either.

A manual is available that covers the OMC engines and also has the electrical schematics for most models that had the OMC engines. Go to, then click on "Manuals" and then the highlighted "Shop and Maintenance Manuals" in the text. The 826767 manuals, most importantly the "Supplement" as it contains the OMC motor information and electrical schematics.

You can still get most of the motor, drive train, and brake parts for Cushman Trucksters, many through the local auto parts stores, but they don't have a cross reference for Cushman parts. In most cases you will need to bring the broken part with you for them to match up. If there is an older guy working there, he may recognize the part and go directly to the shelf to get it. The less experienced can't find anything unless it's listed in the computer cross reference. Cushman used many standard automotive parts. They didn't build them, buying what was needed from other sources instead.

Do a search, or just scan down this forum for posts that were replied to by me. You will find more than you need in information to help you keep your Truckster alive. Information about my Truckster and photos can be found in the thread "Cushman Truckster Saved From The Forest" that I posted shortly after joining this forum. I restored my 1987 Truckster far enough to make it useable and reliable, so it can help me maintain my 3+ acre property. I did not attempt to make it like new again.

This should help you get it running, but there are many other tips in my previous posts about keeping Trucksters running. Searching for "Charley" should find them all. It would be great if you could report back with your success, but don't hesitate to post new questions too. I enjoy helping when I can.


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