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Just your standard ebay/amazon one. Been using for 2 seasons, holding up great! The key is to not ram it back and forth from forward to reverse under power while stuck (doesn't happen much with my big mud tires)!😎 I have a winch both front and back to handle any such situations!

I am running a setup very similar to what you describe (440cc engine/Comet 44 magnum torque converter/FNR gearbox). The gearbox gives approximately a 40% reduction in gearing in the real world. I have a 10t sprocket on the gearbox going to a 23t sprocket on the jackshaft, then a 16t sprocket on...

Ok, just found this thread! This kart is super sweet and you are doing a amazing job on it!

Ok, I was asked how my F/N/R Gearbox was holding up behind a Stage1 420. Ran it hard all summer long with no problems! There is a mod I do to the 40 series driven that is one of the keys to my success. The shaft coming out of the gearbox is approximately .795 in diameter before it is stepped...

Yes, that picture is very helpful, thanks!

Thanks, Sid! I did find this kind, but all it's going to do is bend the axle on a hard hit. Guess I will fab/weld a skid plate attached to the swingarm to cover the sprocket/brake rotor!😎

Thanks Sid! What is your opinion on protecting the sprocket by placing it near the tire (I will modify the jackshaft so the engine stays centered)?

Yes, definitely agree with you! The place We ride has creek crossings with lots of large rocks in the way and I am always concerned about hitting and bending the sprocket/axle. I thought about making a skid plate, but think I would get hung up on it a lot. My idea was to move the sprocket next...

Why is the rear axle sprocket usually placed on or near the middle of the rear axle where it can be hit by every rock/stump on the trail? I am going to move mine right by the left side rear tire (25x12-9 Mudlite XL) where it will be almost impossible to get hit. Is the any reason why I should...

I think a lot of belt life is due to good driving skills which you obviously have!👍

Maybe I'm luckier than most, my hour meter says I have 28.3 hours on the same belt (and my Grandson and I don't baby it)!😅 A torque converter and 70/80 tooth sprocket and he will be ready to rip!😎

Not going to argue with you Sid! Definitely needs torque converter. I can park my front tires on the bottom of that hill, punch it and spin those big mud tires all the way up (engine is only stage1)

Heavy buggy, 212 Predator, 30 series torque converter, 22" tires, 7 to 1 gearing. Will climb 30° grades with ease!😎 30° hill coming up!😬

This #4170 tooth sprocket will work fine with #420 chain (I am currently using the same sprocket and chain). You will need a SK hub for 1" shaft (the SK hubs are far superior to the hubs on standard kart sprockets. Or just get a #35 clutch (won't be near a strong as #420)!😬

With 20" tall tires, absolutely! Even with 10" tires I wouldn't go less than 40 teeth (and even that would be hard on the clutch)! Gear it lower and it will run great and the clutch will last. 😎

Offroad 80 teeth, grass/yard 70 teeth, pavement only 60 teeth.

Thanks but no. I hate being down waiting for parts so I keep a spare of everything in stock (drives my wife nuts)!😎

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).

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...

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! Very nice work! Looks like a great setup!