Stage 3 212cc clone speed.

[kart_goes_brrr]

Measure from the bottom of one of the teeth to the bottom of the next tooth with a tool that measures in inches.
If it measures 1/2 inch, that equals 4/8ths.

And if it doesn't?

 

[Sparkwizard]

What does it measure? Your chain pitch is measured in 8ths of an inch.

 

[kart_goes_brrr]

What does it measure? Your chain pitch is measured in 8ths of an inch.

It's measuring 1/2", what does that mean? Is it #35?

 

[Sparkwizard]

half inch is 4 8ths.
Your pitch would start with a 4.
40, 40, 420...depending on the width of the sprocket and the diameter of the rollers that sit down in the sprocket.

Out of curiousity, what country are you in,
and your age or skill level?

Since you appear to have 35 pitch chain that does not fit that sprocket, I would assume 35 is not correct.

 

[kart_goes_brrr]

half inch is 4 8ths.
Your pitch would start with a 4.
40, 40, 420...depending on the width of the sprocket and the diameter of the rollers that sit down in the sprocket.

Out of curiousity, what country are you in,
and your age or skill level?

Since you appear to have 35 pitch chain that does not fit that sprocket, I would assume 35 is not correct.

I live in Tunisia (north Africa, the maghreb) , I'm 13, I don't understand what you mean by skill level, like in mechanics? Education? Anyways, the chain I got is supposedly #420 but it doesn't fit, I don't really understand the situation right now. Thanks for the help once again.

 

[JimD]

That is because your sprocket is thicker than a #420 chain you got with the clutch you bought. That chain you have will go on a sprocket that is .227 in thickness. So it is really going to be tough figuring out if it is a #40 sprocket or a #428 sprocket they are both the same thickness but it is the size of the roller going into the valley of the sprocket that makes all the difference. A #428 chain has a roller that is .335 in diameter while a #40 sprocket the roller is only .312. The roller in the chain has to get to the bottom of the valley so the chain will roll easily to the next tooth. Europe uses the #428 sprocket on go karts while the US only uses the #41 sprocket on go karts as well as the #35 chain sprockets.
I could confuse the heck out you by going into snowmobile manufacturers but thank God we aren't dealing in those because if you think the above is confusing those manufacturers are even harder to understand.

You need to get a hold of one or the other chain, either the #40 or the #428. The only thing you need it for is to place it in the valley of the sprocket you have on the axle now and see if it goes all the way down to the bottom of the sprocket which is the valley of the sprocket tooth. That will tell us what the sprocket is you have on the axle and then we can tell you what to buy.

 

[kart_goes_brrr]

That is because your sprocket is thicker than a #420 chain you got with the clutch you bought. That chain you have will go on a sprocket that is .227 in thickness. So it is really going to be tough figuring out if it is a #40 sprocket or a #428 sprocket they are both the same thickness but it is the size of the roller going into the valley of the sprocket that makes all the difference. A #428 chain has a roller that is .335 in diameter while a #40 sprocket the roller is only .312. The roller in the chain has to get to the bottom of the valley so the chain will roll easily to the next tooth. Europe uses the #428 sprocket on go karts while the US only uses the #41 sprocket on go karts as well as the #35 chain sprockets.
I could confuse the heck out you by going into snowmobile manufacturers but thank God we aren't dealing in those because if you think the above is confusing those manufacturers are even harder to understand.

You need to get a hold of one or the other chain, either the #40 or the #428. The only thing you need it for is to place it in the valley of the sprocket you have on the axle now and see if it goes all the way down to the bottom of the sprocket which is the valley of the sprocket tooth. That will tell us what the sprocket is you have on the axle and then we can tell you what to buy.

I'm changing the sprocket anyways, so as bob58o mentioned before, if I could find a 45-50T sprocket that's #420, I could use a 10T clutch and the ratio would be exactly 5:1.

 

[JimD]

Good decision, get a #41 sprocket and I am sure someone on this site will give you a part number and style that will be identical to the style you presently have. Did you figure out for sure what the axle size is because it seems more than likely it is going to metric since the sprocket on the axle isn't a typical size used in the US. If it is 1" or 25mm it is close enough. A hammer will get a 1" sprocket on a 25mm axle and everyone love using a hammer it when it is time to get it off we wonder who the jackass was that beat it on the shaft.

 

[bob58o]

I apologize if I added to the confusion.
I wasn’t able to tell the pitch on the sprockets or chain by looking at the photos. I was trying to give options for 1/2” or 3/8” pitch.

But there are also slight differences between #40, #41, #420, #428 that I can’t keep straight

There are some fitment issues when mixing some different chain styles within the 1/2” pitch group of roller chain / sprockets.

Jim is more experienced than I with these chain specifications. He’ll get you set up.

But yes, I fully support the 10T clutch and 50T rear sprocket provided they are both compatible with a single chain style. This is what Jim is trying straighten out.

Just remember a 1/2” pitch 50T is around 8” in diameter. And the rear tires are only 11”. So this only leaves about 1.5” between the bottom of the sprocket and the street.

 

[kart_goes_brrr]

I apologize if I added to the confusion.
I wasn’t able to tell the pitch on the sprockets or chain by looking at the photos. I was trying to give options for 1/2” or 3/8” pitch.

But there are also slight differences between #40, #41, #420, #428 that I can’t keep straight

There are some fitment issues when mixing some different chain styles within the 1/2” pitch group of roller chain / sprockets.

Jim is more experienced than I with these chain specifications. He’ll get you set up.

But yes, I fully support the 10T clutch and 50T rear sprocket provided they are both compatible with a single chain style. This is what Jim is trying straighten out.

Just remember a 1/2” pitch 50T is around 8” in diameter. And the rear tires are only 11”. So this only leaves about 1.5” between the bottom of the sprocket and the street.

I mean that's totally fine, the potholes aren't that bad.

 

[kart_goes_brrr]

So we verified that the sprocket I have for the moment is a #40 or #428 right? The seller hasn't responded yet, I'll update you guys in case he responds

 

[panchothedog]

I live in Tunisia (north Africa, the maghreb) , I'm 13, I don't understand what you mean by skill level, like in mechanics? Education? Anyways, the chain I got is supposedly #420 but it doesn't fit, I don't really understand the situation right now. Thanks for the help once again.

I have been following this thread since the beginning. You have received loads of information from some of the most knowledgeable people that exist. It is obvious that most all of it has gone over your head. Not trying to insult you. Part of the problem is that you are only 13, and probably in an environment not particularly rich in motor or mechanical stuff. From your responses, you are a long way from successfully building your own kart. I give you all the credit in the world for wanting to do so. If any such opportunity exists where you can purchase a complete kart ( even a rough junky one ) you would be miles ahead doing so.

 

[Sparkwizard]

I would like to suggest that we mail some books and educational/ engineering material to this young person.

 

[Grizzlymi]

Such great info in this thread. You seem a head of your time if you are 13 and seem to "grasp" things pretty quick. Not sure the access you have to a local "lawn mower repair shop" in that side of the world(assuming mostly desert conditions), but they could be a huge help with chain size and common parts like clutches and such. Good luck on the project and hope it all works for you to have some fun on the kart!!!

 

[kart_goes_brrr]

I have been following this thread since the beginning. You have received loads of information from some of the most knowledgeable people that exist. It is obvious that most all of it has gone over your head. Not trying to insult you. Part of the problem is that you are only 13, and probably in an environment not particularly rich in motor or mechanical stuff. From your responses, you are a long way from successfully building your own kart. I give you all the credit in the world for wanting to do so. If any such opportunity exists where you can purchase a complete kart ( even a rough junky one ) you would be miles ahead doing so.

Yeah I mean there are karts for sale but they are ridiculously expensive, saw a used one for over 3k dollars which is wayy out the budget. So I decided to build one on my own and as you can see it's not going that well

 

[kart_goes_brrr]

Such great info in this thread. You seem a head of your time if you are 13 and seem to "grasp" things pretty quick. Not sure the access you have to a local "lawn mower repair shop" in that side of the world(assuming mostly desert conditions), but they could be a huge help with chain size and common parts like clutches and such. Good luck on the project and hope it all works for you to have some fun on the kart!!!

The problem is, I already went to many of them and they never have parts for 212cc engines. They always focus on the 79cc or other. Yeah just for info I live in the center of Tunisia (marsa in general) so it's not that deserty there. Anyways thank you so much!

 

[kart_goes_brrr]

I have been following this thread since the beginning. You have received loads of information from some of the most knowledgeable people that exist. It is obvious that most all of it has gone over your head. Not trying to insult you. Part of the problem is that you are only 13, and probably in an environment not particularly rich in motor or mechanical stuff. From your responses, you are a long way from successfully building your own kart. I give you all the credit in the world for wanting to do so. If any such opportunity exists where you can purchase a complete kart ( even a rough junky one ) you would be miles ahead doing so.

The cheapest one was literally complete rust, engine not working, broken chair and they still have the audacity to sell it for 2k dollars.

 

[kart_goes_brrr]

At least for the moment there's a whole frame for sale (300$) without the main components like tires, axle, etc, the good thing is there's already a steering system. I'm thinking of buying it.

 

[kart_goes_brrr]

I have been following this thread since the beginning. You have received loads of information from some of the most knowledgeable people that exist. It is obvious that most all of it has gone over your head. Not trying to insult you. Part of the problem is that you are only 13, and probably in an environment not particularly rich in motor or mechanical stuff. From your responses, you are a long way from successfully building your own kart. I give you all the credit in the world for wanting to do so. If any such opportunity exists where you can purchase a complete kart ( even a rough junky one ) you would be miles ahead doing so.

I'll try to write down all the info, maybe it'll help.

 

[panchothedog]

At least for the moment there's a whole frame for sale (300$) without the main components like tires, axle, etc, the good thing is there's already a steering system. I'm thinking of buying it.

That's a start. With the limited and over price selection available to you, I think I would jump on it.