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Gas golf carts Harley Davidson, Melex, Pargo, Taylor-Dunn and other Misc. Carts. |
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#1 |
Not Yet Wild
Join Date: Sep 2020
Posts: 1
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![]() I am hoping someone might know how to adjust governor / carb linkage, on an OMC 2 cylinder Cushman engine. The engine will not accelerate, when the pedal is depressed. The only way to increase the RPMs, is by moving the carb linkage by hand.
Thanks, John |
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#2 |
Gone Wild
![]() Join Date: Dec 2012
Location: Central North Carolina
Posts: 587
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![]() The manual that you need for the OMC engines can be found on the www.sillylittlecars.com website. From the main screen, click on "Manuals", Then "Shop Manuals in the text on the next screen. Then click on this "826767 - Haulster & Turf-Truckster Service Manual Supplement.pdf ". It will give you all of the OMC engine information for both the 18 & 22 hp versions of this motor. BTW The only significant difference between these is the cylinders. The 18 hp has the spark plugs below center on the cylinder, and the 22 hp version has the spark plugs located above center on the cylinder. The compression ratio is higher on the 22 hp model to increase the horsepower. Both cylinders on a 2 cylinder engine are identical with identical intake and exhaust valves, so only 1 part number. When I last checked, the cylinders, and even a completely factory new short block were still available, if you can afford them (about $1,500 with exchange for the short block). At one time there was a 1 cylinder version of this OMC engine. It was used in one model of Cushman Scooters. Again, with almost all of the parts, cylinder, gaskets, valves, etc. all common between them.
Frequently, the bellows assembly that controls the cylinder temperature by opening and closing doors in the flywheel/fan housing have gone bad and I never found a replacement source for these. I removed mine, and drilled and threaded a hole in the flywheel/fan housing right next to each fan housing door so that the edge of the head of a bolt would catch on the door and hold it against the casting, keeping full air flow across the fins on the head. I don't get any cab heat, but this never worked well anyway. You may need to control the engine temperature in the Northern parts of the World, but my engine works fine here in North Carolina without temperature control, as long as the cylinders get good air flow. I'm back, finally. An issue with my password and no response from the website when I requested a password reset multiple times has kept me off of this site for over a year. My last post was June 16, 2019. Even messages to the webmaster@buggiesgonewild,com went nowhere. Tonight I got a response when I asked again to have my password reset, and I'm back on. I had all but given up, until tonight. Now that I'm back I'll do my best to help others with older Cushman questions, but my experience is mostly limited to 1980's to 1990's Cushman Trucksters and the features of other models that are common to what I have. My own Truckster is a 1987 four wheeler, but I did have a 1989 Police three wheeler with OMC engine too, for a while. I have found quite a few alternate sources and fixes to keep my Truckster running, many of which are in my earlier posts. It's good to be back, finally. Charley |
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#3 |
Not Yet Wild
![]() Join Date: Mar 2024
Location: MA
Posts: 4
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![]() Hi Charlie,
So your saying I can put an 18 hp cylinder on my 22 hp OMC engine with no issues?. BTW my valve covers say Cushman not OMC on them. Do you know why? This is a 1991 22 hp Turf Chassis |
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#4 |
Gone Wild
![]() Join Date: Dec 2012
Location: Central North Carolina
Posts: 587
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![]() These trucksters are snails, even with the 22 hp cylinders. Why on earth would you want to use the 18 hp cylinders? The only real difference between the 18 and 22 hp is the compression ratio and the location of the spark plugs as I described in my post above. OMC owned Cushman back when these motors were designed for them. It doesn't surprise me that some valve covers have different company logos on them. The Turf model has a 2 speed rear end and different gear ratios than the street Trucksters, because they were designed for golf course and estate grounds maintenance. My street version has provisions for the 2 speed differential selection, but there is a cover plate over the location on the differential. Mine is clearly designed for road use, because when I use it around my yard, low is too high a gear and I have to slip the clutch to keep from going too fast. Red line on mine in 3rd gear is about 30 mph too, although 46 mph is possible down hill and with a strong tail wind (definitely over revving the engine, but way too busy keeping it on the road while looking down at the tach). (46 mph in it felt like 170 mph in a car - definitely a white knuckle ride).
OMC also made a 1 cylinder version of this motor for a model of Cushman scooters. I believe the 22 hp cylinder was used on it. Same crank case too, but with a cover plate where the 2nd cylinder would be. It's quite a universal design, but should have been bigger and more reliable. (The weak point seems to be the cylinder design). Without a removeable cylinder head, doing valve work requires special long reach tools and ring compressor. Cylinders are still available for both hp designs. You can still even buy a complete short block new, but I would buy a larger overhead valve engine before going with a new version of the OMC engines. Another oddity about these engines is that both the intake and exhaust valves are identical. You can install the same cylinder part number on either side of the engine. When you do, the intake and exhaust valves get used opposite on one side of the engine while normal on the other side. You should really download a copy of the manual containing the engine information to understand all this. It's the supplement, not the main manual, which just gives you exploded views and part numbers of the bodies, all of which are pretty much un-obtainium unless you can find a donor truckster for body parts somewhere. I live within easy driving distance of Dennis Carpenter Cushman, so engine parts that I need usually come from there. But www.directparts.com has drive train, motor, front end, and OMC engine parts available. The hole pattern in wheels is slightly different than readily available for trailers, etc. and the original Cushman version is becoming scarce, but a machine shop can modify one of the readily available wheels, putting new lug holes at the proper pattern in between the standard pattern lug holes, making the wheel fit either Cushman or a standard trailer. Tires haven't been a problem when searching for them. They seem to be readily available in low or high speed versions. This doesn't matter when used on a Cushman, but don't use a low speed version on a highway trailer. Stay in touch when you have questions. I'm here for a bit almost every morning. Charley |
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#5 |
Not Yet Wild
Join Date: Jul 2024
Posts: 30
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![]() Hey Charlie,,,,my name is Joe r from New Mexico, I just acquired a 1980 (I'm told) single wheeled Cushman Turf Truckster with the 18 HP OMC and the 3 speed transmission with reverse. The tag on dash has these numbers: Model=898515-8010, and nothing else anywhere,,? The buggy had been parked for a couple of years but was never taken care of even when they had it limping around,,,LOL. The body is in fair shape and needs a paint job in the worst way, which I planned to do as soon as I can get it running. The PO had cut some wires and removed others so I got a bit of a mess on my hands. I am a shade tree type of a mechanic so I can do most of the repairs if I KNOW what to do,,, I;m 76 years young so I tend to be a tad slower than others,,,,LOL. Starting out the starter was junk as they had hammered on the case when the bendix would not turn engine over and they broke the magnets inside the case. I finally found one on Amazon which is supposed to be here on Tuesday. On the wiring, I finally decided to scrap all the wiring as it had been compromised from front to gas tank! I ordered a new fuse panel and will rewire it as a simple project as I have done on go carts , ATVs and a couple of side by sides and even a couple of race cars..... The OMC has two coils that had most of the wiring missing and I finally located a wiring diagram from www.sillylittlecars.com using the model number I just quoted. I got new spark plugs, new points and condensor. As per wiring Dwg, I ran a red wire from battery (+) to one side of one resistor, then ran another red wire from other side of same resistor to (+) side of first coil, built a jumper from (-) side of first coil to (+) of second coil. Then another red wire from (-) side of second coil to the terminal at timer after installing new points and condensor. There are NO wires on the second resistor,,? I have rolled and rolled the flywheel and get NO SPARK at the points or either spark plug. I tested both coils one at a time from the battery and using one of the new spark plugs and both coils test good,,spark is kinda weak but both do produce spark,. I wired both coils as per wiring diag and still NO SPARK at either spark plugs OR the points at the timer,,,???
CAN you help me on this, Charlie,,? |
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#6 |
Gone Wild
![]() Join Date: Dec 2012
Location: Central North Carolina
Posts: 587
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![]() @desertjoe,
You should have voltage coming from the key switch to the first coil +, then a jumper from first coil - to second coil +, then a wire from 2nd coil - to the points. The points need to close to complete the circuit to ground (frame). A volt meter check between the frame and the + of the first coil should show + 12 volts with the key switch "on". If it does, then very likely the points are not making contact. You frequently need to use a point file or fine crocus cloth to clean even the new points, since they can tarnish during long term storage. A defective capacitor can also result in no spark, even if the points are making good contact. If you don't have a volt meter, a 12 volt light bulb with some wires attached can be used, but test it on the battery terminals to be certain that it works before going further. Try these and let me know how you do. Charley |
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#7 |
Not Yet Wild
Join Date: Jul 2024
Posts: 30
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![]() Good Morning Charlie,,,,! I did some checking and moving around some of the ignition wiring and found a dead short to ground at the terminal of the timer,,!! The fiber washer that centers the metal terminal from grounding had worn and allowed the terminal to touch the timer housing,!! I machined a new fiber washer, lashed everything up and I now have spark at both coils and the points,,,!!! YEA,,!! A friend on another forum has suggested I replace the years old coils and get a new Double headed coil like is used on the ONAN CCK engines for more trouble free performance. What are your thoughts?? Also, one other thing,,what do you recommend to use on years of caked on oil/dirt on the engine? I prefer some Home Made products IF they work as good as the store bought,,,??
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#8 |
Gone Wild
![]() Join Date: Dec 2012
Location: Central North Carolina
Posts: 587
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![]() The coils on a Truckster are pretty standard automotive coils that can likely be bought from your nearest auto parts store. Show one of them to them and they will sell you a replacement, but if you are getting good spark you shouldn't need to replace them. Coils usually work, or they don't. Why consider replacing them if they are working.
I used Purple Power and water to clean my Cushman engine and parts. BTW, I have two incomplete OMC engines worth of parts as spares. No cylinders worth trying to use though, but if you should need something, maybe I have it. The shorted timer connection is a new one. I never heard anyone say that happened before, but glad that you found it. Charley |
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#9 |
Not Yet Wild
Join Date: Jul 2024
Posts: 30
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![]() Hey Charlie,,,I got yet another thing I need your help with,,, I received the new starter and installed it ,,and the bendix would NOT engage on the flywheel,,,!! By turning the bendix backwards so bendix starts to move out towards the flywheel The OD of the bendix teeth are 1/16" from the OD of the flywheel teeth,,!!!. The bendix on the new starter has 13 teeth and the flywheel has 130 teeth. YET the old starter bendix also has 13 teeth. I then removed the new starter and installed the old starter,,,same situation. I DO NOT know if the PO ever actually used this old starter or if was added when they could not get engine to start. They did beat on the case and broke all the big magnets inside case so maybe they never had a workable starter,,,??
Do you know if there are different tooth count flywheel and or starter bendix for these OMC's ,,,JEEEZE,,,,,,,!!! |
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#10 |
Gone Wild
![]() Join Date: Dec 2012
Location: Central North Carolina
Posts: 587
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![]() Joe, as far as I know, there is only one flywheel design for the OMC two cylinder engines. Was the new starter supposed to fit and work on Cushman OMC engine?
The manufacturer likely makes different versions under different part numbers. Is your battery polarity correct? Maybe the starter is running in reverse from the way the Bendix is designed. It should extend when power is applied, to engage the flywheel. Charley |
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