Author Topic: 219 front sprocket  (Read 340 times)

Darren burkitt

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219 front sprocket
« on: 09 Jan 23, 05:52 pm »
Anyone know where to get a 219 front sprocket for the tav as gemini no stock or another sprocket set up different size thanks

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Seven racer

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Re: 219 front sprocket
« Reply #1 on: 10 Jan 23, 09:12 am »
They look to be as rare as hens teeth, unless you know anyone in the States that could get one and send you. It might be worth ringing Gemini, to see if they have any idea when they will get stock?

The only thing I could find, that was remotely likely was in Germany, but there are no shaft dimensions, I suspect you would get one shipped from there though.

https://www.beneduracing.com/en/starter-honda/847-honda-engine-ritzel-11-18-benedu-racing-for-all-your-kart-parts.html

Otherwise it might be worth considering going down the 420 chain route?

Peter

Chris Brown

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Re: 219 front sprocket
« Reply #2 on: 10 Jan 23, 09:29 am »
Might be worth asking Stretton, I know they keep some parts, and Rhys used 219 on Kim which I assume (possibly wrongly) came off an ex Stretton hire kart he bought. Otherwise an industrial power transmission company might be able to help, Combidrive is our local one: http://combidrive.com/.

RhysN

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Re: 219 front sprocket
« Reply #3 on: 10 Jan 23, 03:48 pm »
Just to have some input. For those who haven't been involved with karting as much as Darren has, 219 is used almost exclusively on high powered racing karts. It's strong, compact and has a huge variety of axle sprockets available and very cheaply. (under £6 usually) and in one tooth increments. I used it because of those factors on Kim, and it was only because the axle moved that I had issues. I would not hesitate to use it again IF I could get the sprocket for the torque converter. If/when I make progress on another CK it will use 35 chain. Proven to be strong enough, lots of axle sprockets (cheaply) and not as bulky to deal with as the 40 series chains, some of which will give clearance issues.
I have just been speaking with Gemini, the supplier that made those sprockets has changed ownership and they say much more difficult to deal with than the previous regime. I am doing some overseas questioning.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

RhysN

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Re: 219 front sprocket
« Reply #4 on: 11 Jan 23, 07:08 am »
They look to be as rare as hens teeth, unless you know anyone in the States that could get one and send you. It might be worth ringing Gemini, to see if they have any idea when they will get stock?

The only thing I could find, that was remotely likely was in Germany, but there are no shaft dimensions, I suspect you would get one shipped from there though.

https://www.beneduracing.com/en/starter-honda/847-honda-engine-ritzel-11-18-benedu-racing-for-all-your-kart-parts.html

Otherwise it might be worth considering going down the 420 chain route?

Peter
I asked these people what shaft size and chain this is for. It's a 22mm shaft and 428 chain, so no help to Darren's quest unfortunately.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

StefanN

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Re: 219 front sprocket
« Reply #5 on: 11 Jan 23, 09:27 am »
Is 15T the smallest 219 your can get to fit the shaft of a Comet TAV?   What size main sprocket are you thinking of using Darren?

Darren burkitt

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Re: 219 front sprocket
« Reply #6 on: 11 Jan 23, 05:27 pm »
I've got 98 tooth axle sprocket but can't find one to go on tav

Glynn

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Re: 219 front sprocket
« Reply #7 on: 25 Jan 23, 01:40 pm »
I had the same problem.  After hours of searching, discussions with Gemini Karts and Talon Engineering I finally got a quote from Talon for £120 + VAT.  They were obviously not interested in small quantity production.  In the end I made my own by cutting the teeth off the gear provided with the torque converter to form the hub, then I cut a new set of teeth by drilling and filing a piece of steel plate which I welded to the hub.  It sounds a lot more difficult than it really is because the teeth are formed by carefully drilling a ring of holes.  All that said, I think this would be an ideal part for the club to buy in quantity as there appear to be benefits when using 219 chain.

Ian L

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Re: 219 front sprocket
« Reply #8 on: 29 Apr 23, 08:11 pm »
All, I had an email from Chris at Gemini to say he has ordered more 219 TAV drive sprockets. However lead time could be up to 12 weeks. In the interim I now have a Rotax 219 14T drive sprocket which looks machinable to the right width with the use of a thrust washer, this has a 3/4 inch hole so planning to sleeve this down to 5/8 and cut in a key way - will see how that goes!

NewbieNick

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Re: 219 front sprocket
« Reply #9 on: 30 Apr 23, 07:45 am »
Hi guys i am having the same problem as everyone else with sprockets. I have found a couple of suppliers selling clone torque converters with 10 tooth 428 output sprocket.
i can also get a 70 tooth 428 drive sprocket. Is there any reason not to use this combination?

Cheers Nick 

Jimr1999

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Re: 219 front sprocket
« Reply #10 on: 30 Apr 23, 08:46 am »
Horses for courses Nick, and across the web differing opinions exist. Sprockets for 219 tend to be smaller in diameter for a given tooth number and the chain runs smoother but is potentially weaker than a larger pitch chain. See this article... https://cutpriceracing.com.au/store/Page17/
420 chain is for motorcycle applications up to about 125cc usually, so, arguably, as we use a similar size wheel and have a similar torque transfer as a 125 to it, it should work out fine.
If you hold store in the article I sent you above, and I am not sure I do, then 219 should break more readily. I have not heard of a 219 chain breaking on any of the cyclekarts so far.
This probably has you no wiser  ;D
Also this... https://gokartnerds.com/how-to-select-chain-for-go-kart-and-minibike/?utm_content=cmp-true

Jim
« Last Edit: 30 Apr 23, 08:51 am by Jimr1999 »
... You can lead a horse to water, but a pencil must be lead.

Ian L

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Re: 219 front sprocket
« Reply #11 on: 30 Apr 23, 10:38 am »
Nick, as I see it so long as you have a matched set of sprockets and chain at a suitable ratio around 1:7 being a good start, as far as the drive goes you should be Ok. However you then have to look at how this is all packaged into the CK, a 70T 428 with a 12.7mm pitch will be around 11.2 inch dia, this compares to a 219 93T of around 9 inch dia - its this difference, and the so say smoother running of the 219 that has kept me on this path. But as I say both are ok so long as you have the space to package and nest if needed the axle sprocket with the TRV and then have a means of achieving sufficient adjustment. Im still working this packaging out getting close to a solution but would be interested in how you achieve this. Well thats my logic anyway!! Good luck. Ian

NewbieNick

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Re: 219 front sprocket
« Reply #12 on: 30 Apr 23, 03:42 pm »
Thanks Jimr & Ian, Ian i two am very interested in how it will fit together. As you say 70 tooth sprocket is 12 inches, i have cut a 13 inch fake sprocket & assembled on to rear axle i have 4.5 inches of ground clearance. Is this enough.Any advice from other builders would be appreciated.

Ian L

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Re: 219 front sprocket
« Reply #13 on: 30 Apr 23, 07:21 pm »
Nick, I have similarly clearance but at the front axle and seat base.

Ian Fletcher

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Re: 219 front sprocket
« Reply #14 on: 01 May 23, 07:55 am »
4.5" should be fine as there's no suspension travel.  By the way how many teeth do the Gemini 219 front sprockets have?