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Old 10-29-2014, 09:26 PM   #1
mitchelperkins
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Default Electric to Gas Conversion: Predator 670 V-Twin

I know I'm stepping into very uncharted waters when it comes to attempting to perform a proper electric to gas conversion, but yes, that is my goal.

The story
I was given a 1970 Pargo electric golf cart. bought new batteries, didn't run, returned the batteries and trashed every electrical component on it.

The Plan
I have taken a 1991 Yamaha G9 rear end, significantly modified it, and sucessfully installed it on the old Pargo, so at the current phase it is a gas golf cart with no wiring or engine. I have also purchased the stock F/R assembly and lever, so the cart will have proper forward and reverse.

The engine I ordered was the Predator 670cc V-twin. I haven't seen many conversions with this engine so that'll make the project even more interesting. Ordered engine on 10/5, still not expected to ship until Halloween, so i hope to have it sometime next week and begin working on the mount.

My current total investment is a mere $570 including engine and all parts, as the cart itself, the tires, and the F/R lever were all free. $500 on the motor and $70 on the rear end.
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Old 10-29-2014, 09:30 PM   #2
mitchelperkins
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

here is a picture of the rear end as of now
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Old 11-01-2014, 06:26 PM   #3
sho305
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

Looks like a good project, that cart looks nice and not common. With a yami rear you should be good to go, you will have to find a 1 3/16 primary clutch for it.

Only issue I see is you might have to change the rear mounting. Yamaha axle mount on a cradle in order for the primary/secondary clutch distance to stay constant as changing it will change shifting characteristics. Can also torque on the swingarm depending on the belt angle. Club car do use leaf springs like that and mount the front of the cradle to a snubber that just holds it level, or you can use a heim joint. The yamaha use spring shocks and no leafs. Modern carts use one front mount so it can articulate, the G1/2/9 yamaha used two front mounts and it didn't. But didn't need a transverse arm or similar either like you do with an articulating rear unless you make a 4 link. A G2/9 will corner harder while an articulating cart will lean in corners but ride nicer in rough terrain.

I like how distinct the cart looks! You should be good other than mounting one battery, key switch, fuel tank and pump, cables/controls for throttle and choke, etc. Some do keep the tank that comes with a clone if they can fit it under the seat, its not very big but depends on how you use the cart. I've been on 6 hour rides with mine glad I have a big tank as most stock carts have. That said they don't use much fuel compared to an atv/utv. You will have to build an exhaust or extend it out from under the seat.
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Old 11-12-2014, 07:52 PM   #4
mitchelperkins
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

Quote:
Originally Posted by sho305 View Post
Looks like a good project, that cart looks nice and not common. With a yami rear you should be good to go, you will have to find a 1 3/16 primary clutch for it.

Only issue I see is you might have to change the rear mounting. Yamaha axle mount on a cradle in order for the primary/secondary clutch distance to stay constant as changing it will change shifting characteristics. Can also torque on the swingarm depending on the belt angle. Club car do use leaf springs like that and mount the front of the cradle to a snubber that just holds it level, or you can use a heim joint. The yamaha use spring shocks and no leafs. Modern carts use one front mount so it can articulate, the G1/2/9 yamaha used two front mounts and it didn't. But didn't need a transverse arm or similar either like you do with an articulating rear unless you make a 4 link. A G2/9 will corner harder while an articulating cart will lean in corners but ride nicer in rough terrain.

I like how distinct the cart looks! You should be good other than mounting one battery, key switch, fuel tank and pump, cables/controls for throttle and choke, etc. Some do keep the tank that comes with a clone if they can fit it under the seat, its not very big but depends on how you use the cart. I've been on 6 hour rides with mine glad I have a big tank as most stock carts have. That said they don't use much fuel compared to an atv/utv. You will have to build an exhaust or extend it out from under the seat.
Thank you for the feedback! Sadly I haven't made much headway on the project lately due to my motor beig backordered. Hard to do much without an engine!
The vtwin is a huge engine and I had already accepted that serious modification would be required to mount the engine. When I recieve it, I plan on cutting out all the original battery trays between the cart's frame and adding a steel sheet to the underside of the frame. Doing this is the only way for the engine to clear the seats(and it doesn't even come with a gas tank on it!)
Luckily little to nothing needs to happen with the front end of the cart as the steering is excellent and has absolutely no play in it.

My current struggle is mounting the F/R lever. I did manage to find one but I can't figure out how to set it up on my cart.
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Old 11-13-2014, 12:38 PM   #5
fisherj21
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

If you put a piece of metal in the old battery trays and mount the engine to it the only real problem you will have is that it will vibrate real bad unless you make some sort of isolator between engine and mounting plate, when i did my electric to gas conversion on my old cart i mounted the engine the way you are wanting to with no isolator and it vibrated like crazy, my wife hated it lol
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Old 11-13-2014, 07:11 PM   #6
panteramatt
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

So the predator twin is physically larger than the briggs?
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Old 11-14-2014, 09:35 AM   #7
Dave in VA
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

I would say so. 670 cc vs 625cc for the 23 hp Vanguard. Other Vanguards are even smaller...
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Old 11-14-2014, 09:44 AM   #8
bokeasmowl
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

My 18hp is 570 cc's and smaller in statuor than the 23.
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Old 11-14-2014, 10:00 AM   #9
Dave in VA
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

And why is the 24hp Briggs Intek in my Husqvarna 724cc, 100cc more than the 23 Vanguard?
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Old 11-14-2014, 02:55 PM   #10
mitchelperkins
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Default Re: Electric to Gas Conversion: Predator 670 V-Twin

Quote:
Originally Posted by fisherj21 View Post
If you put a piece of metal in the old battery trays and mount the engine to it the only real problem you will have is that it will vibrate real bad unless you make some sort of isolator between engine and mounting plate, when i did my electric to gas conversion on my old cart i mounted the engine the way you are wanting to with no isolator and it vibrated like crazy, my wife hated it lol
what do you mean by an isolated? like a piece of rubber between the engine and the steel sheet?

if I weld the sheet to the frame I feel like it shouldn't vibrate too bad
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