Hello everyone! Im new and could really use alittle help lol

[Garyquick]

1St off hello my name is gary!! I bought a older carter brothers kart last year and finally got my new predator 212cc motor on and running but when i got the motor broken in after a fee laps and 3 oil changes and opened her up today and my top speed was 13 mph? I have a cert. Clutch on it that was on the previous motor but was thinking about getting a torque converter? Think that will help? But from what i read in researching around the moter should reach about 20 or 25 mph completely stock? Anyone have any advice on what it could be or where i should start looking for the answers why its only reaching 13 mph?? Thanks again guys$! Have a happy safe 4th of july to by the way!!: )

 

[jtonythejett007]

Hello Gary...

Welcome aboard!
I am by no means an expert but can at least attest (SP)? to a 212cc running more than 13MPH out of the box...hopefully some of the senior members can chime in with advice.

 

[Whitetrashrocker]

We can help but need a few bits of info first.
Go count the teeth on all the sprockets. And we also need to know the rear tire size.
Post those up and your questions will be answered.
Thanks for joining DIY a professional will be with you shortly.

 

[MTNSleder]

Press harder on the Gas pedal... Solved

You say this Kart is a little on the old side, my guess is bad bearings with a side of bad gear ratio and a hint of wore clutch...

 

[Scout]

I agree with Whitetrashrocker, we'll need to know your ratio and tire size. Also, I wonder if the clutch might be burned up or glazed.

 

[Functional Artist]

What kart?

What gears?

What tires?

How heavy is the driver?

Goin' up hill? or down?

 

[Hellion]

FA is on to something with his question #1 and I must concur. There is no kart. This is fiction.

 

[Garyquick]

Thanks everyone for the fast responses!! I helieve it is a carter brothers 2766 tx. I bought it off someone who was selling it but didn't know much about it saying the bought it off someone else so i searched for go karta looking like mine and rear tires are 18 x 9.50 -8 and do u guys mean the teeth count on all the sparkets? 3 total right? Lol sry im real new to this and learning lol

 

[Garyquick]

And the driver ways 140

---------- Post added at 09:35 AM ---------- Previous post was at 09:31 AM ----------

And not going up or down any hills im just driving on a road by my house

 

[anickode]

And the driver ways 140

---------- Post added at 09:35 AM ---------- Previous post was at 09:31 AM ----------

And not going up or down any hills im just driving on a road by my house

That double gear reduction is your problem. The jackshaftjust was probably intended for a torque converter. Those will top out around a 1:1 ratio, multiplied by your final drive ratio.

Instead you have a fixed ratio. 13mph is not surprising.

 

[Whitetrashrocker]

Yes the tooth count on all sprockets.

 

[Garyquick]

That double gear reduction is your problem. The jackshaftjust was probably intended for a torque converter. Those will top out around a 1:1 ratio, multiplied by your final drive ratio.

Instead you have a fixed ratio. 13mph is not surprising.

So if i take off the clutch and install a torque converter will tjat fix the problem? What do u suggest? And im jot aure what u mean by double gear reduction? Lol

---------- Post added at 11:33 AM ---------- Previous post was at 11:31 AM ----------

Yes the tooth count on all sprockets.

When i get back home ill count them and let u know how many teeth om each thabks so much for all your guys help!!

---------- Post added at 11:33 AM ---------- Previous post was at 11:33 AM ----------

Yes the tooth count on all sprockets.

When i get back home ill count them and let u know how many teeth om each thabks so much for all your guys help!!

 

[anickode]

So if i take off the clutch and install a torque converter will tjat fix the problem? What do u suggest? And im jot aure what u mean by double gear reduction? Lol

---------- Post added at 11:33 AM ---------- Previous post was at 11:31 AM ----------



When i get back home ill count them and let u know how many teeth om each thabks so much for all your guys help!!

---------- Post added at 11:33 AM ---------- Previous post was at 11:33 AM ----------



When i get back home ill count them and let u know how many teeth om each thabks so much for all your guys help!!

You have 2 reductions going on. From the clutch, which is probably around 10 tooth, to maybe a 40 tooth, which in turn drives another small sprocket, with chain to the big axle sprocket.

When you have consecutive gear reduction, the ratios multiply. So if you have (for example) a 4:1 driving the jackshaft, and a 5:1 driving the axle, you could pretty easily have a 20:1 overall reduction going on, which, depending on tire size, would make it a hokey pokey torque monster that takes off like crazy but has no top end.

A torque converter starts out at a very large ratio at low rpms where the engine is weakest, and transitions to a smaller ratio (typically around 1:1) at full rpms. This gives you some grunt to get going, but would transition you into that (for example again) 5:1 overall ratio for more top speed.

You could install a torque converter, or you could put a smaller sprocket on the input of the jackshaft. The latter option would give you more top speed at the expense of torque, so you'd take off slower and have more trouble climbing hills.

 

[Garyquick]

You have 2 reductions going on. From the clutch, which is probably around 10 tooth, to maybe a 40 tooth, which in turn drives another small sprocket, with chain to the big axle sprocket.

When you have consecutive gear reduction, the ratios multiply. So if you have (for example) a 4:1 driving the jackshaft, and a 5:1 driving the axle, you could pretty easily have a 20:1 overall reduction going on, which, depending on tire size, would make it a hokey pokey torque monster that takes off like crazy but has no top end.

A torque converter starts out at a very large ratio at low rpms where the engine is weakest, and transitions to a smaller ratio (typically around 1:1) at full rpms. This gives you some grunt to get going, but would transition you into that (for example again) 5:1 overall ratio for more top speed.

You could install a torque converter, or you could put a smaller sprocket on the input of the jackshaft. The latter option would give you more top speed at the expense of torque, so you'd take off slower and have more trouble climbing hills.

Oh ok i kinda see what ur getting at. I just got home so ill count the teeth on all 3 sprockets. And what would you personally do? I just kinda figured id be able to go about 20 25 with this engine complelty stock and then add a better air intake and exhaust for alittle extra something but so that reduction is the reason i am only able to do 13 mph tops?

 

[anickode]

Oh ok i kinda see what ur getting at. I just got home so ill count the teeth on all 3 sprockets. And what would you personally do? I just kinda figured id be able to go about 20 25 with this engine complelty stock and then add a better air intake and exhaust for alittle extra something but so that reduction is the reason i am only able to do 13 mph tops?

Right. Your engine is governed to 3600 rpm. No matter what bolt on parts you add to it, you won't get any more speed without either removing the governor (might get you to 17mph) or changing your gearing.

We'll need to know teeth on all 4 sprockets. That includes the clutch.

 

[Garyquick]

Ok so i think i got this lol me and my bro counted a few times but the clutch is 12. And the 1 that runs to is 36 then rhe other side is 12 on the smaller one and 54 on the bigger one

 

[Garyquick]

Right. Your engine is governed to 3600 rpm. No matter what bolt on parts you add to it, you won't get any more speed without either removing the governor (might get you to 17mph) or changing your gearing.

We'll need to know teeth on all 4 sprockets. That includes the clutch.[

I thought even with the governor on it would still go around 25?

 

[anickode]

You've got a 13.5 to 1 gear ratio. Your engine must spin 13.5 times to make the wheel go around once.

Wide open throttle, that's 266 rpm on the tires. 18 inch tire times pi = 56 inches per revolution, or about 1200 fpm. Which is pretty much exactly 13mph. Simple math.

An 18 tooth on the input of your jackshaft in place of the 36 tooth would be the cheapest way to get you to 25 mph. Then do your engine mods for power and remove the governor. That will get you in the 30-35 range on flat ground. It won't have the grunt to do any serious hills, but it'll be a fun yard kart.

Or get yourself a Comet clone torque converter for 100 bucks, bolt it on, and blast around. The driving part of the torque converter would replace the clutch on the engine, and the driven part of the torque converter would replace the 36 tooth sprocket on the jackshaft. That would put your dead stop ratio in the 15:1 range, and top out at around 4.5 to 1, which would give you a 60mph kart with enough torque to take off road with the governor removed.

 

[Whitetrashrocker]

With that big of a buggy I wouldn't even bother with a clutch. Go for the torque converter and grin till you run out of gas.

 

[Garyquick]

You've got a 13.5 to 1 gear ratio. Your engine must spin 13.5 times to make the wheel go around once.

Wide open throttle, that's 266 rpm on the tires. 18 inch tire times pi = 56 inches per revolution, or about 1200 fpm. Which is pretty much exactly 13mph. Simple math.

An 18 tooth on the input of your jackshaft in place of the 36 tooth would be the cheapest way to get you to 25 mph. Then do your engine mods for power and remove the governor. That will get you in the 30-35 range on flat ground. It won't have the grunt to do any serious hills, but it'll be a fun yard kart.

Or get yourself a Comet clone torque converter for 100 bucks, bolt it on, and blast around. The driving part of the torque converter would replace the clutch on the engine, and the driven part of the torque converter would replace the 36 tooth sprocket on the jackshaft. That would put your dead stop ratio in the 15:1 range, and top out at around 4.5 to 1, which would give you a 60mph kart with enough torque to take off road with the governor removed.

Ohh ok i see what your saying i been watching videos the last 2 hours to lol so if i just get that clone torque converter that would replace the clutch and the 36 tooth sprocket and with just adding that you think i could hit 60 ??

---------- Post added at 05:33 PM ---------- Previous post was at 05:30 PM ----------

With that big of a buggy I wouldn't even bother with a clutch. Go for the torque converter and grin till you run out of gas.

Im probably just going to get that clone torque converter that he stated before.. U think that would work out better to?