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FJ belt drive conversion?

Started by Pat Conlon, April 21, 2022, 09:58:13 AM

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Pat Conlon

There is a company in Brazil called M3moto that specializes in motorcycle belt drive conversions.
They are currently working on a FJ conversion.





I have posted a few questions on this modification, I have yet to hear a response from Luis at M3moto

1) Can the sprocket cover fit over the wider belt sprocket? You need this cover so you can mount the clutch slave cylinder.
2) You will need a spring loaded belt tensioner pulley mounted to the lower edge of the swing arm so you can keep the proper belt tension as the swing arm moves up and down.
3) What is the tooth count and diameter of the countershaft belt sprocket and tire sprocket?
4) The belt is wider than the stock 530 chain, so if you offset the back tire to fit the belt, will the center line of the back tire now be offset (to the right) from the center line of the front?

I like the idea of a clean, light, belt drive on my FJ...if it can made to work...the devil's in the details.
The latest generation X9 Gates carbon fiber belts (not shown in the above photos) are now stronger, narrower (same width as a 530 chain)  and can have a tighter sprocket wrap than the previous generation belts.

https://www.gatescarbondrive.com/products/motorcycle-scooter






Love to hear your thoughts

Cheers

Pat





1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

giantkiller

First time I whacked the throttle on my chopper it snapped the 1 1/4" belt like a rubber band. And shot it 100 feet behind me. But didn't do any damage. Now I just roll on the throttle. It still spins up the 250 tire. :pardon:
86 fj1350r
86 fj1380t turbo drag toy (soon)
87 fj1200 865 miles crashed for parts
89 fj1200 touring 2up
87 fzr1000 crashed
87 fzr750r Human Race teams world endurance champion
93 fzr600 Vance n hines ltd for sale
Custom chopper I built
Mini chopper I built for my daughter just like the big 1

Pat Conlon

Quote from: giantkiller on April 21, 2022, 04:44:05 PM
First time I whacked the throttle on my chopper it snapped the 1 1/4" belt like a rubber band. And shot it 100 feet behind me. But didn't do any damage. Now I just roll on the throttle. It still spins up the 250 tire. :pardon:

Dan, didn't you have the big S&S engine on your chopper? What kind of torque #'s were you seeing, 120+ft.lbs?
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

fj1289

Quote from: giantkiller on April 21, 2022, 04:44:05 PM
First time I whacked the throttle on my chopper it snapped the 1 1/4" belt like a rubber band. And shot it 100 feet behind me. But didn't do any damage. Now I just roll on the throttle. It still spins up the 250 tire. :pardon:

Lol!  My first thought was "at least it shouldn't break the cases when it breaks!"

giantkiller

Quote from: Pat Conlon on April 21, 2022, 08:19:35 PM
Quote from: giantkiller on April 21, 2022, 04:44:05 PM
First time I whacked the throttle on my chopper it snapped the 1 1/4" belt like a rubber band. And shot it 100 feet behind me. But didn't do any damage. Now I just roll on the throttle. It still spins up the 250 tire. :pardon:

Dan, didn't you have the big S&S engine on your chopper? What kind of torque #'s were you seeing, 120+ft.lbs?
Ultima elbruto. Basically a Merch motor. 120hp/120ftlbs. My dyno on the 1350r was 167hp/117ftlbs.
86 fj1350r
86 fj1380t turbo drag toy (soon)
87 fj1200 865 miles crashed for parts
89 fj1200 touring 2up
87 fzr1000 crashed
87 fzr750r Human Race teams world endurance champion
93 fzr600 Vance n hines ltd for sale
Custom chopper I built
Mini chopper I built for my daughter just like the big 1

fj1289

Quote from: giantkiller on April 22, 2022, 06:42:13 PM
Quote from: Pat Conlon on April 21, 2022, 08:19:35 PM
Quote from: giantkiller on April 21, 2022, 04:44:05 PM
First time I whacked the throttle on my chopper it snapped the 1 1/4" belt like a rubber band. And shot it 100 feet behind me. But didn't do any damage. Now I just roll on the throttle. It still spins up the 250 tire. :pardon:

Dan, didn't you have the big S&S engine on your chopper? What kind of torque #'s were you seeing, 120+ft.lbs?
Ultima elbruto. Basically a Merch motor. 120hp/120ftlbs. My dyno on the 1350r was 167hp/117ftlbs.

I would have expected like a 4" belt or something like a top fuel blower belt!