Speed Reducer ?

[rmelo99]

I understand the best way to reduce speed for little kids is gearing. The Manco Rattler II that I picked up for the kids this weekend mentioned a kit available.

I checked the parts diagram and see a “speed reducer assembly” which has a couple of gears and I guess a small jack shaft.

Are these available from aftermarket as bolt ons? Should I be reaching out to Manco? This is getting repowered with a predator so I want to make sure it will still work.

Thanks

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[Smerft85]

Problem with running a reduction setup with a jackshaft is it likely wont fit. I'd run the little 79?cc predator, 12t clutch and 72t axle sprocket with #35 chain, then utilize the throttle limiting screw that is on the predator to reduce pedal travel. Will save you money, be less permanent and wont be overpowered but you can back a screw out later to give access to more power as the kids grow. That's a fairly small kart, and I think that may be your best bet.

 

[anickode]

Problem with running a reduction setup with a jackshaft is it likely wont fit. I'd run the little 79?cc predator, 12t clutch and 72t axle sprocket with #35 chain, then utilize the throttle limiting screw that is on the predator to reduce pedal travel. Will save you money, be less permanent and wont be overpowered but you can back a screw out later to give access to more power as the kids grow. That's a fairly small kart, and I think that may be your best bet.

Limiting throttle with a centrifugal clutch is a recipe for burned up clutches.

Honestly, what I do on mine is run a chinese TAV2 setup, then move the governor spring down to a lower hole. You could use the throttle stop too, but I prefer to move the spring. A torque converter will handle reduced throttle far better than a centrifugal clutch. Then as the kids grow, all you've gotta do is change your adjustment to give them more speed.

Plus that TAV2 kit will be much cheaper than anything Manco has to offer (if they even offer it). Heck, at under 60 bucks, it'll be cheaper than just about any other solution.

 

[Smerft85]

That's if a cvt will even fit in the frame. The critter and the redfox we have are identical in build as far as I can tell, don't think I could get a cvt on the redfox. The smaller engine will reduce available power out of the box, the 212 box-stock will burn the tire with the setup I mentioned above without the screw being utilized, but a minor adjustment I wouldn't think would affect the clutch too much, too much adjustment of course will wear a clutch if you are barely beyond the engagement point. If youd like I can see what it takes to mount a cvt on our redfox, but I have a feeling there isn't room for it.

 

[anickode]

Good points... I hadn't considered it being a one wheel peel.

Still, limiting the throttle with a centrifugal clutch just does not work out well. You can get away with dialing it down a bit, but not by a whole lot. Most clutches start to engage around 1800 and don't lock up till at least 2400.

 

[rmelo99]

Limiting throttle with a centrifugal clutch is a recipe for burned up clutches.

Honestly, what I do on mine is run a chinese TAV2 setup, then move the governor spring down to a lower hole. You could use the throttle stop too, but I prefer to move the spring. A torque converter will handle reduced throttle far better than a centrifugal clutch. Then as the kids grow, all you've gotta do is change your adjustment to give them more speed.

Plus that TAV2 kit will be much cheaper than anything Manco has to offer (if they even offer it). Heck, at under 60 bucks, it'll be cheaper than just about any other solution.

I didn’t do a torque converter to keep costs down on my full build. All the ones I found are $90+ where can I get one for $60


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[anickode]

I didn’t do a torque converter to keep costs down on my full build. All the ones I found are $90+ where can I get one for $60


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Buy it now on eBay. About 100 different sellers, but they're all the same product. Pick one with good seller rating, and you're good to go.

 

[Smerft85]

Here is where I think you'll find the issue running a cvt/tav, there isn't enough room between the engine and the frame to fit the pullies. These are both 212 predator engines, the one with the centrifugal clutch is the fox2, and like I said, nearly identical. I'd still recommend what I said above and ditch the idea of jackshafts and cvt's.

 

[rmelo99]

I moved the screw on 212 from the other kart I have without the roll cage. I can keep the clutch engaged.

I guess I’ll try the same on this one. Got all my parts ordered up. Hope to you have it running when they all arrive next week.

This cart is a bit smaller lengthwise so much better chance of getting the kids behind the drivers wheel (6 & 9 YO)


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