Quick ratio question

[Jmart432]

Hi guys I have done my research on ratios for my kart but I'm thinking I might be able to save some money if I use the rear sprocket and chain off an old honda trx90 quad bike we have. The kart I'm building has a honda gx160 5.5hp motor and 10inch/250mm rear wheels. Would I be able to use the 50t sprocket off the quad bike with say a 10t centrifugal clutch? I'm mainly going to be driving on grass/pavement/road but I do live in a fairly hilly area. Would that ratio with those tyres be ok?

Thanks

---------- Post added at 04:30 AM ---------- Previous post was at 03:33 AM ----------

Oh another thing, the chain and sprocket on the quad bike is 428 which is 1/2 inch pitch. Would I be able to use a 420 clutch since it has the same 1/2 inch pitch but is slightly narrower then the chain?

 

[landuse]

Ratio sounds good to me

 

[tinamcjittles]

Just make sure your chain grips the sprocket well and that ratio sounds like it will have plenty of torque for hills!

 

[chancer]

You generally do not want to mix Chain sizes.
The pitch 1/2" is the same but other sizes make the chain NOT seat properly in the sprocket. and will still slip or wear out the sprockets prematurely.

This chart may help a little. but it is not fully complete (missing 428)

 

[chancer]

Here is more on mixing chains. The correct answer is YES and NO. LOL
Give this thread a quick read. Read ALL of it, As my original answer on the following thread was WRONG, Smarter guys weighed in for us though.
http://www.diygokarts.com/vb/showthread.php?t=33505

 

[Jmart432]

Thanks for the responses. It all sounds good but I can't find a 10t 428 clutch which is why I was asking about the 420 clutch. Would a 4.2:1 (using a 12t 428 clutch) be to high for 250mm wheels?

 

[landuse]

Thanks for the responses. It all sounds good but I can't find a 10t 428 clutch which is why I was asking about the 420 clutch. Would a 4.2:1 (using a 12t 428 clutch) be to high for 250mm wheels?

Your will be really pushing it with that ratio. I wouldn't really try it

 

[itsid]

Sorry.. sor some reason or another I highly doubt we talk about 10" wheels...

*shrugs* IDK..
But I assume we indeed talk about a 18" tyre on 10" rim (a 18" wheel)
(in which case the 5:1 ratio will not work at all... muchless a 4.2:1)

So allow me to just ask for a picture.

Oh and no: 428 chain on 420 sprockets isn't working, the larger roller diameter will just eat the 420 sprocket in no time.

'sid

 

[Jmart432]

What do I have to do to run 18" tyres

[EDIT -sid-]AND AGAIN....[EoE]

Hi everyone. I'm gathering the parts to make myself a go kart and currently I have a Honda gx160 5.5hp motor, a rough frame, and a rear axle off a Honda trx90 quad. I want to use the quad bike axle to save cost (Only spent around $20 all up so far) and also because it already has brake, a sprocket and wheels attached.
The problem I am having is that the sprocket on the quad is 50 tooth 428. I can't afford a torque converter so I want to use a centrifugal clutch. Is a jackshaft my only option to run 18 inch tyres with a 50t rear sprocket? The smallest clutch I can find is 10t but thats for 420 chain so actually 12t.
Ideally I don't want to use a jackshaft as I am using the quad axle, sprocket, brakes, and tyres to save money.

Thanks for any help

 

[Angel]

To make a jackshaft is not that expensive, but you can try to run it directly and see if is powerful enough.

 

[Jmart432]

Hmm yeah ok. From what I've heard though, a 4.2:1 ratio on 19" tyres with a clutch would not work at all.

 

[Jmart432]

Also, was just playing around with it and I'm thinking a jackshaft is the way to go as I could just use a #35 centrifugal clutch and sprocket on the jackshaft and then a 428 sprocket to the rear axle.
For the jackshaft, I will have to use bearing won't I?
Anything else I should look out for?
And I can do the maths for the reduction gearing but it would be great if someone could give me the overall ratio it should be from the clutch to the axle to run 19 inch wheels on a 5.5hp engine. It will be driven around roads/paths and grass. Don't want to go slow but I do live in a fairly hilly area so I guess it needs to be lower geared?

Oh yeah got some pics when I was playing around with it

Thanks

 

[Angel]

that is my transmission: 2.7in on clutch pulley 7.8in on jackshaft pulley 12t on js sproket and 428 36t axle sproket. i'm pretty proud of it. i have to say i use a 3hp engine and it has a pretty good launch so it shouldn't be a problem on your engine

 

[chancer]

8 to 1 should get you going.

 

[2SlickNick]

The Yerf dog 3203's have 20" stock reAr tires with a 6:1.

 

[chancer]

The Yerf dog 3203's have 20" stock reAr tires with a 6:1.

and
6.5 Hp and a Torque Converter not a Cent. clutch.

 

[Jmart432]

Torque Converter questions

[EDIT -sid-]AND AGAIN....[EoE]

Hi everyone. I am in the process of building my go kart and I'm using a honda gx160 5.5hp engine and the rear axle/sprocket/tyres of a old honda trx90x go kart. The tyres are 18".
Because of the size of the tyres and the 50t sprocket I was going to have to use a jackshaft but after adding up the price of all the things I would need I think it might be better just to get a torque converter.
The torque converter I'm thinking I will get is this onehttp://www.cutpriceracing.com.au/store/Torque-Converter-Clutch-420P-10Tooth-3-4-bore-FREE-420P-Chain-and-Sprocket/
That will give me a 5:1 ratio with the sprocket I have already got on the axle. Is this too high for 18" tyres? I'm guessing the quad bike axle uses some standard hub to mount the sprocket so it shouldn't be too hard to change to a bigger one. Should I get a bigger one?

Also the pitch of the sprocket on the axle is 428 and the torque converter is 420 so I'm guessing I need to change the axle sprocket anyway?

Thanks for any help.

 

[Poboy kartman]

You just don't don't seem to get it. Starting a bunch of redundant threads for the same kart....and even worse : THE SAME ISSUE will endear you to no one here and will get you fewer answers.

 

[Eric87]

How about this torque converter . Then buy a 9 tooth tav sprocket and get a 54 or a 60 tooth rear sprocket . You should be able to find a rear sprocket in a 420 to fit that Honda sprocket hub. So spend less on TC and buy chain and sprockets in 420 size.

 

[itsid]

Jmart..

Stop asking the same question over and over again!:toetap05:

'sid

PS THREADS MERGED