2020 coleman bk200 help

[Brian.lars]

Just picked up this used 2020 coleman bk200 and it was running sweet. Noticed a rattling noise when running close to top speed....then went to turn left and lost my drive and reverse.....motor revs fine but doesn't move. Any tips of what to do? Would also like to throw some "go fast" parts but I don't know where to find any Info to get started. It doesn't leak. I swapped all fluids when I got it.

 

[panchothedog]

DON'T know the kart. A picture of the drive train would help. Does it have a transmission ? You say you lost reverse so l guess it must.

 

[Brian.lars]

Here's the pics

 

[panchothedog]

Your pictures helped a lot less than I thought they would. I can see it is chain drive from the trans back and the spec sheet says it has a CVT. That stands for
constant velocity transmission. Between the engine and the transmission there should be belt drive two pulleys system. They are more than pulleys, they are clutches, as rpm increases one expands while the other contracts changing the gear ratio. You're going to have to help out a little. Remove the clutch cover,
between the engine and the transmission, jack up the back of the kart and support it with some jack stands or something so that the back wheels could turn of they were working. Start the kart and give it a little gas ( no need to rev way up ) and look for what is not spinning. The clutches both on the engine and the driven or secondary as well as the sprockets both from the transmission and the axle are fixed with a key so they don't freewheel.
If it is internal to the transmission I probably won't be able to help, but first let's make sure everything else in the drive train is working.

 

[Brian.lars]

So I think I need to take off that black piece?

 

[panchothedog]

That looks like it to me. Should be the two clutches I described with a belt running around them. Also since I don't know what kind of torque converter you have pay attention to the belt and check if one side is angled ( cut or manufactured on an angel) more than the other.

 

[Brian.lars]

Broken belt.....also looks like there's pieces in the clutch/thing? Those pieces are floating in there

 

[Brian.lars]

I ordered the belt, should be here in a week....tried looking for "go fast" parts buy seems like the carb is the only upgradeable thing....

 

[Denny]

Looks like the clutch is stuck closed. You may want to pull it off and disassemble it and clean it out and relive it and make sure all is ok.

 

[Brian.lars]

The "clutch" is the piece with the big spring showing right?

 

[Denny]

No, while that is a clutch. The smaller one off the engine is the one I’m talking about. But I’m thinking about it more you should probably go through both of them. I hope you got the best belt you could find. Like a Dayco or Gates or some other top brand or you’ll be doing this again in short order. Good luck!

 

[panchothedog]

At rest the clutch on the engine should be open so the belt is driven by the small diameter, and the other clutch should be closed so it is at its largest diameter. As rpm increases engine clutch will close increasing in diameter and the other clutch will open decreasing in diameter changing the gear ratio. It does look like your engine clutch is stuck in the closed position. This will cause the belt to wear out and break. You said you ordered a new belt. Did you find a shop for COLEMAN parts, or maybe their website? Being a 2020 year kart I would think should be able to find any parts needed. Your stuck clutch needs to be delt with before reinstalling the belt. You need to Google torque converter videos ( there's dozens of them ) because it probably is just stuck from dirt and belt dust as they constantly wear a little bit. If you disassemble it get a spray can of brake parts cleaner to use on everything inside of it. DO NOT oil the PARTS on reassembly as this will attract dirt and grime and cause it to stick again. They are not that complicated, watch a few videos maybe several times and get acquainted with the parts. When it comes time to install the new belt don't try to stretch it over the pulleys. REMOVE both clutches, place the belt around both and then slide the clutches onto their respective shafts. The correct belt will not be tight on its relaxed or resting position and will allow you to do this.

 

[Brian.lars]

I ordered parts off the coleman website. But they didn't offer clutches or any internal parts...i guess they want a person to buy the whole setup instead.

 

[panchothedog]

so watch the video's and then tear into yours. At this stage you really have nothing to lose. There is very little inside the clutches that actually breaks. Getting stuck in closed or high gear position as yours is, is by far the most common problem suffered by these types of drives. If you can't get it unstuck there are lots of aftermarket clutches available. Meanwhile DON'T throw away your old broken belt as it will help determine which series of a clutch ( 20 or 30)
is on your kart and would make a difference should it be necessary to purchase a new one.

 

[panchothedog]

Back here again. I am terrible at technologie, so bad that I don't know how to post a link even though one of the members on here tried to walk me through it. Amway go to Go Power Sports website. They are one of top 4or 5 kart supply shops in the country. They have a section with 40 how to videos and about 5 or 6 of them pertain to torque converters. One in particular is titled
G Y 6 which I think is the style of engine and drive system you have. It is more of a motorcycle type engine as compared to the predator or clone style small industrial engines many of us run on our older karts. Same basic principles but the inside of that clutch is a little different. Actually it looked a little simpler.
they should also be a source for parts and many good videos covering all sorts of problems you may encounter owning a go kart.

 

[Brian.lars]

Thank you for help. I will check out the website and maybe they have "upgrades" for this cart. It's pretty fun. Just needs some more power

 

[Denny]

Well if you want more power out of that engine you can go big bore kit all the way up to 140 or so cc. Should be good for an extra 2 1/2hp or so. They may have bigger camshafts. You’ll have to look around for those though. You’ll also have to rejet the carburetor.

 

[Brian.lars]

I think this might be a 170cc. Tops out at 35ish. If it could go 65mph I would be happy but on trails it's pretty fun. Just needs a little more pep

 

[Denny]

I think this might be a 170cc. Tops out at 35ish. If it could go 65mph I would be happy but on trails it's pretty fun. Just needs a little more pep

I doubt it is that big. Probably around 125 or so. Even at that size it probably puts out about 7 hp or so.

 

[madprofessor]

constant velocity transmission

It's actually automobile steering and front suspension that employs CV-joints, or Constant Velocity joints.
We call gokart belt drive transmissions torque converters (TC's), or call them CVT's (Constant [or Continuous] Variable Transmissions).
Not trying to nitpick a point, just want Brian to understand the important part, which is the variable in the CVT. That automatically varying ratio from the crankshaft to the output sprocket is how you get the best power from the engine transmitted to the final drive for the varying speeds and loads the kart experiences between dead stop to Jesus save me!
What is a CVT, or Continuously Variable Transmission? (jdpower.com)