That's a Polaris 244 (250)cc air cooled sled engine. Now here's the deal with Polaris and Not Yamaha but Ezgo golf carts. The older 1980s - early 90s Ezgo 2 stroke single cylinders engines are built by the same exact engine manufacturer in Japan as the Polaris company engine are built called Fuji Industrial. The Ezgo engine is sometimes referred to as a Robin 244cc and Polaris singles and double cylinder engines up to the early 2000s are all very similar in design. The fact is that if you own a Ezgo with the 2 stroke engine in them, and want more options to make much more power like a 250 should have? The bores and strokes are identical between the two and a Polaris 250 ATV cylinder a sled single will bolt right on the Ezgo blocks. Also the twin cylinder Polaris 488-500cc engines, a single cylinder off one of these engines will bolt on a Ezgo bottom end as well. This way your reducing the engines weight by going to a lined aluminum cylinder, over the solid iron Ezgo jug. The engine will run a 💯× cooler with the iron bored aluminum jug as well. The only downside is that in order to run these cylinders it's highly recommended that you run the original intake system and exhaust expansion pipe which will benefit your engines upgraded cylinder. This will do away on most sled cylinders the use of reed valves because it's called piston port design, simpler, easier and 4 less things to fail as metal or fiber reeds do fatigue and fail over time. But the ATVs jugs do require the use of reeds for those applications. The best way to run the exhaust system is to get a head pipe from a sled with the 2 45° bends in it, and a expansion pipe with built in silencer off the ATVs which is pretty much straight and exits out the rear of the carts swing arm assembly under the bumper. Some minor fabrication is required for the Ezgo engines fan shrouding to enclose the cylinder and head to keep it running ice cold and some minor changes to the throttle cable and of course the original exhaust system should be replaced with a pipe which will increase your power levels by using the pulses which basically gives your 2 stroke and good shot in the arm of power, or usually called its (power band) which is only for expansion piped equipped engines. Otherwise it will run fine with the original exhaust system, but it's not going to benefit it in any form plus it's very restrictive for sound quality over performance. Unfortunately the Yamaha 2 strokes are much different than the EZGO is, but you can, like in this video replace the old or worn out Yamaha with a cheap Polaris engine? The torque converter primary clutch will fit either or. But much more extensive modifications will be required to do such a transplant into a Yamaha G. At least the Ezgo is already laid out for something like this. Mine started as a EZGO Marathon model for the engine of which I put into a more modern Ezgo TXT which has forward neutral and reverse shifting in the transaxle. This way you don't have to run your 2 stroke backwards for reverse.......
I have an old Yamaha like that,, I use it everyday in the summer,,one thing maybe you should find is the plastic pieces that go around the cylinder for better cooling,, mine will run 22 mph and has quite a bit of power,
I really appreciate your posting a video. I have a 1982 that I am trying to get running. Your video is really hard to watch. Its makes me a little sea sick. Please make smooth slow pans and tilts. I used to be a pro camera operator.
What pipe is that?
That's a Polaris 244 (250)cc air cooled sled engine. Now here's the deal with Polaris and Not Yamaha but Ezgo golf carts. The older 1980s - early 90s Ezgo 2 stroke single cylinders engines are built by the same exact engine manufacturer in Japan as the Polaris company engine are built called Fuji Industrial. The Ezgo engine is sometimes referred to as a Robin 244cc and Polaris singles and double cylinder engines up to the early 2000s are all very similar in design. The fact is that if you own a Ezgo with the 2 stroke engine in them, and want more options to make much more power like a 250 should have? The bores and strokes are identical between the two and a Polaris 250 ATV cylinder a sled single will bolt right on the Ezgo blocks. Also the twin cylinder Polaris 488-500cc engines, a single cylinder off one of these engines will bolt on a Ezgo bottom end as well. This way your reducing the engines weight by going to a lined aluminum cylinder, over the solid iron Ezgo jug. The engine will run a 💯× cooler with the iron bored aluminum jug as well. The only downside is that in order to run these cylinders it's highly recommended that you run the original intake system and exhaust expansion pipe which will benefit your engines upgraded cylinder. This will do away on most sled cylinders the use of reed valves because it's called piston port design, simpler, easier and 4 less things to fail as metal or fiber reeds do fatigue and fail over time. But the ATVs jugs do require the use of reeds for those applications. The best way to run the exhaust system is to get a head pipe from a sled with the 2 45° bends in it, and a expansion pipe with built in silencer off the ATVs which is pretty much straight and exits out the rear of the carts swing arm assembly under the bumper. Some minor fabrication is required for the Ezgo engines fan shrouding to enclose the cylinder and head to keep it running ice cold and some minor changes to the throttle cable and of course the original exhaust system should be replaced with a pipe which will increase your power levels by using the pulses which basically gives your 2 stroke and good shot in the arm of power, or usually called its (power band) which is only for expansion piped equipped engines. Otherwise it will run fine with the original exhaust system, but it's not going to benefit it in any form plus it's very restrictive for sound quality over performance. Unfortunately the Yamaha 2 strokes are much different than the EZGO is, but you can, like in this video replace the old or worn out Yamaha with a cheap Polaris engine? The torque converter primary clutch will fit either or. But much more extensive modifications will be required to do such a transplant into a Yamaha G. At least the Ezgo is already laid out for something like this. Mine started as a EZGO Marathon model for the engine of which I put into a more modern Ezgo TXT which has forward neutral and reverse shifting in the transaxle. This way you don't have to run your 2 stroke backwards for reverse.......
Cant figure out my solenoid wiring
I have an old Yamaha like that,, I use it everyday in the summer,,one thing maybe you should find is the plastic pieces that go around the cylinder for better cooling,, mine will run 22 mph and has quite a bit of power,
I really appreciate your posting a video. I have a 1982 that I am trying to get running. Your video is really hard to watch. Its makes me a little sea sick. Please make smooth slow pans and tilts. I used to be a pro camera operator.