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[Sterling Steele]

I have a 79cc 4 stroke engine that was on a water pump. I pulled the motor off to put on a bicycle. Problem, the motor has a threaded shaft not a keyed shaft. It's also a smaller shaft. It's definitely not a 3/4 inch shaft like the torque converter fits. Question, does anybody sell an adapter so a torque converter will fit this motor or will I have to just buy a different motor?

 

[GW's Motorized]

I'm not sure. You should measure the shaft size, if it's anything like the 2 Briggs 5hp engines I have, it has a 1/2 inch shaft. Someone probably makes an adapter. I was just going to swap the crank in mine because I had a spare crank.

 

[Sidewinder Jerry]

I have a 79cc 4 stroke engine that was on a water pump. I pulled the motor off to put on a bicycle. Problem, the motor has a threaded shaft not a keyed shaft. It's also a smaller shaft. It's definitely not a 3/4 inch shaft like the torque converter fits. Question, does anybody sell an adapter so a torque converter will fit this motor or will I have to just buy a different motor?

I'm going to assume your threaded shaft is at least a 1/2 inch in diameter. I know of no adapter anybody makes that would work. You're probably have to put a sprocket on the engine shaft with a chain to drive a sprocket/shaft for the torque converter.

 

[darwin]

Pics might help. Is it threaded on the outside or a bore hole on the end? See a lot of adapters just not sure what you have. No key slot at all?


1/2 ID to 3/4 OD, have 5/8 also in choices. Not sure how you'd set it though. Tack weld it to the shaft?

Amazon.com

 

[Sterling Steele]

Pics might help. Is it threaded on the outside or a bore hole on the end? See a lot of adapters just not sure what you have. No key slot at all?


1/2 ID to 3/4 OD, have 5/8 also in choices. Not sure how you'd set it though. Tack weld it to the shaft?

Amazon.com

It's a 5/8 shaft. No key slot.

 

[Sterling Steele]

It's a 5/8 shaft. No key slot.

It is 5/8 inch shaft but drops to 1/2 inch with threads. Motor came off a water pump.

 

[darwin]

Found the closest thing, problem is no keyway on the adapter to keep the clutch from slipping. If the threads are right on the adapter that will keep it from turning.

RH 5/8"-18 Threaded Tube Adapter,fits 3/4" ID Hole, ( Rod Ends, Heim Joints ) | eBay

5/8"-18 Thread Tube Adapter. TUBE ADAPTER SIZE.

www.ebay.com

 

[Cannonball3]

Check for a taper, a lot of pumps are tapered.