FNR Gearbox fab/weld/install

Oldguy1951

Oldguy1951
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The following pictures show how I added a FNR gearbox to my Predator 212cc and 30 series torque converter. A custom engine/gearbox bracket needs to be made so the engine and gearbox are the proper distance apart for the belt being used and both engine and gearbox shafts have to be perfectly true to each other. This bracket then lines up with the go-kart engine bracket so it can slide back and forth for chain tension.

One more picture showing spacing from a more overhead view.
 

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ThePugLord

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Would be nice to have one for a 420 made , here’s my set up for my 212
 

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Oldguy1951

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Here's one I did with a Stage1 420. Was a little worried if the gearbox would handle the power, but my Grandson and I thrashed it hard all summer and it held up great.

Another shot all painted up and installed!

Would be nice to have one for a 420 made , here’s my set up for my 212
Very nice work! Looks like a great setup!
 

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Oldguy1951

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What’s your sprocket set up and what’s your top speed ?
I am currently running a 10t on the gearbox and 70t on the axle. I have tweaked the governor linkage so I can get 4300rpm. With this setup, my top speed is 33mph (more than fast enough for the tight wooded trails I ride on) and the low end power is unstoppable (I can spin the rear tires going up the steepest hill). I had a 13t on the gearbox which gave 40mph but hardly ever got going that fast and the lower gearing is easier on the belt (went all summer long on the same belt (genuine Comet) and it still looks good.
Gary
 

Kristopherjh83

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Here's one I did with a Stage1 420. Was a little worried if the gearbox would handle the power, but my Grandson and I thrashed it hard all summer and it held up great.
Glad to see the gearbox holds up to the hp. I was worried about that myself is why I haven’t bought it. Was considering going the way of Polaris or atv engine with reverse
 

Oldguy1951

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I have also considered an ATV engine with reverse, but most of them have shaft drive and I don't want to go that route. The FNR gearbox is holding up well so I am going to stick with it for now (I do have a complete spare that I can throw on in less than an hour if need be).
 

Kristopherjh83

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I have also considered an ATV engine with reverse, but most of them have shaft drive and I don't want to go that route. The FNR gearbox is holding up well so I am going to stick with it for now (I do have a complete spare that I can throw on in less than an hour if need be).
Interested in selling it? And I agree on the shaft drive. From what I’ve gathered so far is that really only late 90’s early 2000’s model Polaris 4wheelers have gearbox set up for cvt. The other ones are like you have as far as readily available. I heard peerless made one and then there’s the impossible to find comet brand. My manco deuce has the one made by comex (from Italy). Can’t find nothing about obtaining a replacement so I was thinking to switch out what I got currently for a live axle. It’s already hell to turn around but having reverse would help tremendously
 
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