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Author Topic: Final drive sprocket  (Read 103 times)

Slack Alice

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Final drive sprocket
« on: 29 May 2019, 04:25:33 pm »
Right guys...thoughts are turning to purchase of a large rear sprocket. I believe the TAV. Uses 420 size. Where do the other sprockets come from!

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RhysN

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Re: Final drive sprocket
« Reply #1 on: 29 May 2019, 05:32:10 pm »
TAV sprockets come with a choice of sprocket, 35, 40 series and sometimes with the real racing kart type 219 chain. 219 sprockets any kart supplier will have them in increments of 1 tooth. (I'm using a 96 tooth). Others, our usual suggestion Gemini Karts. Edit! Now TAV sprockets with 428 series which gives a great range of quality of chain.
« Last Edit: 15 June 2019, 05:16:38 pm by RhysN »

RhysN

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Re: Final drive sprocket
« Reply #2 on: 15 June 2019, 05:23:35 pm »
I just found this useful website, quite a few questions answered on this.
http://www.gizmology.net/sprockets.htm
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BillC

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Re: Final drive sprocket
« Reply #3 on: 28 July 2019, 04:55:47 am »
Hi Guys;
The TAV2 unit is a U.S. product with a drive pulley and a driven pulley and they come with either a #35 pitch sprocket behind the driven pulley or a #40 pitch sprocket. The #35 sprocket has 12 teeth and the #40 sprocket has 10 teeth. The normal ratio desired is 6 to 1 for our karts so with the 12 tooth #35 a 72 tooth is used on the rear axle and with the #40 10 tooth a 60 tooth sprocket is used . Top speed of our karts is around 45 to 50 mph ; that would be 72 to 80+ kph to you.  The #40 chain is a little heavier than the #35 but both work just fine .
Chris Brown hangs around us and I would think he could help you with these and I would be glad to answer any questions . I did a thread on our forum on tuning the TAV2 ; yes you can change springs in them and make them engage different but then that is opening up a whole nother can of worms. The shaft on the Driven pulley is 5/8 inch U.S. oops there are them dang inches again! So if your wanting to change to some strange pitch of pulley you may have a problem with it fitting the 5/8" shaft.
Cheers Bill C

Chris Brown

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Re: Final drive sprocket
« Reply #4 on: 28 July 2019, 09:46:04 am »
A lot of us are on the cyclekartclub.com forum, including Rhys, who has a lot more experience than me. The availability of imperial parts is quite good here, just generally more expensive than metric. Sourcing an imperial bore sprocket shouldn't be a problem, just need a good industrial drive supplier, there are at least two within 20 miles of me.

RhysN

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Re: Final drive sprocket
« Reply #5 on: 28 July 2019, 10:07:46 am »
There are alternate sprockets for the TAV in the US, going to as small as 8 tooth, sometimes makes the packaging easier, and allows for other than 6:1 more easily than swapping out axle sprockets.

BillC

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Re: Final drive sprocket
« Reply #6 on: 28 July 2019, 03:09:44 pm »
Great ! I was wondering about how you were dealing with the output shaft being 5/8.
Hey RhysN do you go under that handle under cyclekartclub forum or go by something else.
I know everything about the TAV's except how they do on CycleKarts being that I am just building my first.
I had a brand new pre 2009 Comet laying around I am using on my kart. I have used the Comet Tav's for about as long as they have made them.
There is a place over here in Ohio called BMIKarts and Steve has the best prices on the bits for these; don't know if he will ship to GB but you can ask ! He is a great guy !   bmikarts.com
I know they make sprockets down to 8 tooth but I wouldn't use it and here's why.......you are asking the chain to turn a really sharp corner and even the best chain will bind I would not go below 10 tooth. Unless things are so tight and you have to; I would use the largest sprocket I could use behind the driven pulley and try to get the ratio I wanted with the axle sprocket.
I am really enjoying looking at the builds you guys are doing.
Cheers Bill

RhysN

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Re: Final drive sprocket
« Reply #7 on: 28 July 2019, 04:55:33 pm »
Bill, we don't need to use US sources, we have very good agents here in the UK for pretty much everything, and shipping kills most things from the US anyway (especially BMI!).
I understand what you are saying about tight wrap on sprockets, but I can tell you that a number of the cars which were at Tieton use the smaller ones, it makes a whole lot of reasons, and they don't do a whole lot of hours anyway in real terms.
Not being rude, but please read the Welcome message which Stefan posted on the Home page, it's good to have you on here, just respect that the page was set up for those in the UK.. FYI I have been to Tieton 3 times, and other US events, been playing with these things for close on 15 years now!

BillC

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Re: Final drive sprocket
« Reply #8 on: 29 July 2019, 08:28:06 am »
Mr Nolan ;
I'm sorry I didn't mean to hit a nerve ; I thought UPS and FedX shipped all over the world . I had no idea you could not get things right from here reasonable . I was surprised you were using the TAV units I thought y'all used the 2 to1 oil bath type clutches . I started karting over 45 years ago and I have built many a toy with the TAV units . I do know quite a bit about them in fact I just informed the guys on our cyclekartclub forum ; that you are a member of ; that the TAV units can be tuned........they didn't seem to know it . Some of the guys have already ordered some different springs and started trying different stall speeds and delaying the driven pulley to get the most out of them. We will find out what helps and what doesn't . Did read the rules and saw nothing about keeping my opinions or knowledge to myself. I joined to enjoy what you are doing over there and maybe pick up a good idea or two; probably the same reason you joined our forum. That said I will respect you in either one! I hope we become good friends.
I am sure you know quite a bit more about CycleKarts than I do; but I'll catch up.
Cheers Bill