Need some help with go kart governor

[SPYDERLK]

I doubt it is the governor,, it is the final reduction ratio,,

You need more torque to keep the engine RPM's up,, the only way to do that is install a bigger wheel gear, or a smaller engine gear,,,

OR,,,,, wait for it,,,,

install a larger displacement engine!! :thumbsup:

While I agree that more torque is needed, it doesn稚 hit max torque until 3200 rpm. There is no way this thing is putting out anything close to that. The governor kicks in so fast it痴 ridiculous. I致e watched videos of people after bypassing the governor and it lets the rpms get up there. I don稚 want to completely bypass it bc I do want some limitation of max rpms. I just want to figure out how to adjust the spring to allow it a higher max.

Why dont you just tighten the spring, or better, change its acting position on the governor lever? ... And then be prepared to lower the gearing a smidge.

Its pretty simple really.

:confused3:​

 

[L120]

Hello,

I'm love gokarts just the simple yard carts reconditioning a 1-seater another right now. When you describe probs with the kart, we need to know....

1. What HP engine do you have
2. Clutch type
3. rear tire size
4. Drive wheel sprocket teef. This config with HP will give us something to work with
5. Will son be responsible enough if you did bypass the governor? This is probably what needs to happen...I could be wrong.

It's just a neato thing to figure out & fix things with your son. He can look up at you and say, "That's my dad".

Where I buy a lot of parts...They have everything & I mean everything
Go Kart Galaxy - Your Online Source for Go Kart Parts and Minibike Parts

 

[zmountaineer]

Hello,

I'm love gokarts just the simple yard carts reconditioning a 1-seater another right now. When you describe probs with the kart, we need to know....

It's just a neato thing to figure out & fix things with your son. He can look up at you and say, "That's my dad".

Where I buy a lot of parts...They have everything & I mean everything
Go Kart Galaxy - Your Online Source for Go Kart Parts and Minibike Parts

3 HP 98cc. Centrifugal clutch. Tire size is 13”. I’m unsure of the number of drive wheel sprocket teeth but is a 35 chain and the clutch has 11 teeth. There is also a gear reduction sprocket between the clutch and wheel sprocket. I want to avoid by passing the governor completely. Ideally I would like to just up the engine rpms a little. The more and more I run this through my head an additional throttle cable to the carb might be my best solution. My son is very hesitant on the go kart right now. He burps the pedal frequently which probably isn’t the best for the clutch. But when he’s on straight flat land he floors it and has fun riding in front of us. He’s 7 years old and just learning this.

Here is a link to the actual go kart.

Coleman CK1 Go Kart - Sam'''s Club

 

[L120]

Diagram of drive components for ref...I'm not confident this is correct not really showing the vari-drive components.
Engine and Drive

I'll guess to say the kart has variable drive that changes ratio the more RPM being more low end power at low RPM and faster speed at high RPM.

I can assure you that a 3 HP engine isn't going to pull wheelies (lol) if the governor is removed or bypassed. It's probably all the 3 HP can do is run the vari-drive and moderately large rear wheels. Another solution would be to find a sprocket at the rear wheels to get more torque sacrificing speed for power. May need to pickup some extra #35 chain and links if you go with the bigger rear drive sprocket.

Quick estimation is that the kart may go at 15-20 mph WOT with no gov learning that your son is 7 y/o is concerning. So maybe we should go with the larger rear sprocket and if that doesn't pull the incline, then bypass the governor. Like I said, 3 hp isn't a whole lot probably better suited for flat land.

 

[L120]

Found this video that shows what is going on with the drive reduction. I was wrong about the vari-drive belt system.
Coleman CK 1 GoKart Predator 212 Swap Side-by-side comparison and build video - YouTube


For right now, I would find a larger sprocket for the rear wheel. Try one maybe an inch less than the rear wheel itself.

 

[zmountaineer]

Found this video that shows what is going on with the drive reduction. I was wrong about the vari-drive belt system.
Coleman CK 1 GoKart Predator 212 Swap Side-by-side comparison and build video - YouTube


For right now, I would find a larger sprocket for the rear wheel. Try one maybe an inch less than the rear wheel itself.

It goes 15 mph on flat land measured with a 4 wheeler following. Without the governor it is supposed to go approximately 24 mph. I will gladly sacrifice top speed for more low end torque. He doesn’t use the speed that is there now. This go kart is just to get him used to power equipment and maintaining speed. To operate it responsibly. He understands the concept and can operate it within limits. His twin sister on the other hand is reckless and needs more teaching/coaching. I have a nice half acre track set up for them on relatively flat ground. Problem is to get to it from the house you have to go up a moderate climb to get to it and it doesn’t make it on its own.

If you’ve got a link to a larger sprocket that I can put on the rear axle then I’d like to see it. I’m new to the go kart world and I would only be guessing at this point. I’m not mechanically inept but I don’t know everything. Changing bolt on parts are of no problem for me.

His cousins have 107cc youth 4 wheelers that pull the hill no problem. But they definitely sound like they are pushing out more governed rpms.

 

[Gunny]

If you can get the governor issue fixed, or find that the governor is set properly, you may want to try one of the torque converter clutches. I built two karts for the grandsons and wound up going to that type clutch, good low end torque, good top end speed. I paid around $100 each for the ones I got (Comet brand), but a quick search came up with this:

GO KART TORQUE CONVERTER KIT CLUTCH 3/4" COMET TAV2 3-75 218353A 12T | AE-Power

 

[zmountaineer]

If you can get the governor issue fixed, or find that the governor is set properly, you may want to try one of the torque converter clutches. I built two karts for the grandsons and wound up going to that type clutch, good low end torque, good top end speed. I paid around $100 each for the ones I got (Comet brand), but a quick search came up with this:

GO KART TORQUE CONVERTER KIT CLUTCH 3/4" COMET TAV2 3-75 218353A 12T | AE-Power

That’s something to think about. I’d have to find one for a 5/8 inch shaft though. I told my wife if I have to spend more than $100 I’d just swap in the predator engine for not a whole lot more. Thanks for the link

 

[L120]

I bought a Predator 6.5 HP for my garden tiller. I've learned the engine on your kart is a Predator 3 hp. These motors are Honda clones and I've grown confident of their durability. The thing is with these engines is the governor lever (under gas tank thru motor case) is the base for all things throttle in these engine. With these engines, you don't simply bypass the gov, you buy or build a throttle kit and tie the gov lever back with a spring OR crack open the engine case and remove the gov components then sealing the hole for the shaft.

One of many websites. Also check ebay & Amazon for "predator throttle kit"
http://www.trjkarting.com/predator-throttle-kit/

 

[L120]

Link to sprockets...check around other pages of the site. Maybe you will get lucky to find one with you bolt pattern. If not, drill your own.
Go Kart Galaxy - Hubs & Sprockets

You must get in there and understand the governor and it's settings. This may help at first finding how to set it for the most RPM possible. If the gov is going to limit a required RPM to get this kart going, then bypass it. Also going with a larger wheel sprocket will reduce top speed which is what I'd want for a very young boy. I wouldn't go over 10-12 mph. The battery powed Power Wheels top out at 8 MPH.

The rear sprocket calculation.

My rear wheels are 12" dia or 12" tall. I use a 72 tooth sprocket. The sprocket is almost as big as the wheel. This may help determine your new sprocket teeth which is in relation to wheel size. Go with the largest sprocket you can probably an 84-92 toof'r for #35 chain