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#Post#: 12050--------------------------------------------------
Does anyone use #219 sprockets and chain?
By: Ade Colmar Date: December 1, 2024, 4:02 am
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As part of working out how much space I need for the engine,
torque converter and final drive I've been looking as the
availability of final drive components. I'm working on the basis
that I need a final drive ratio in the region of 6:1 to 7:1. I
may have missed some possible sources, but my digging to date
suggests that the choice is fairly limited in #420/428, very
limited in #35, but plentiful in #219. The added advantage of
#219 is that it is cheaper and lighter. So, although primarily
intended for racing karts, I'm wondering if anyone has used this
spec of chain on their cyclekart?
#Post#: 12051--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: Jimr1999 Date: December 1, 2024, 8:27 am
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Some do use 219 chain and sprockets. From memory, you can buy a
15 tooth 219 cog from Gemini that fits the TAV with a little
fettling.
The 219 kart sprockets go up to 99 tooth so 15:99 ratio = 6.6:1
, An acceptable ratio.
219 chain is not recommended for joining due to it being
weakened, so you ideally need plenty adjustment and a
purchasable chain length to start with. You should take that
into account in the design stage.
Some who run the larger cogs have cheeks on the outside of the
large sprocket to stop the chain jumping off as much.
HTML https://www.ebay.co.uk/itm/335603753463
#Post#: 12052--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: Jimr1999 Date: December 1, 2024, 8:53 am
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#35 chain is used a lot on mini bikes it has a 3/8" pitch and
the large sprockets are available up to 75T. Making it fit a
carrier might take a bit of engineering. The standard TAV
sprocket for #35 chain seems to be 12T so in this set up a 12:75
ratio or 6.25:1
BUT, you can get a 10T #35 TAV sprocket which would allow a
ratio of up to 7.5:1
HTML https://www.ebay.co.uk/itm/266600434852
420 chain has 10T standard with the torque convertor (Again, 9T
and 8T are available if you are willing to ship from the states,
see photo) and up to 70T on the big sprocket.
#Post#: 12053--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: Ian F Date: December 1, 2024, 12:13 pm
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I use 219 chain on GNasher, but this is a very light cyclekart.
219 is sold in fixed lengths of chain already joined together.
I think the longest length you can get is 116 links.
Consequently, for longer lengths you need to join two lengths
together, which needs two split links. The split links are
defineately the weak link, but then again your only subjecting
then to 10hp.
As for economy, you may have to buy two length of 219, whereas
you can buy 420 by any length you want. Also, I'm not sure how
much the 219 will stretch compared to 420, but I have done a
very full season with no issues so far.
#Post#: 12054--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: NewbieNick Date: December 1, 2024, 12:24 pm
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Hi Ade, about 1/2 of the Southwest guys use 219 chains , they
don’t seem to have any problems. Your only drive sprocket option
is 15 tooth from Gemini Karts.
Cheers Nick
#Post#: 12057--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: Ade Colmar Date: December 2, 2024, 7:20 am
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Thanks for the insights. It would appear that if I want a
ratio around 7:1, the plate wheels in any of the chain sizes are
quite scary diameters! Apart from feeling like I'm being
followed by something like a large circular saw, you need a lot
of space for these larger plate wheels (25-29cm diameter)! I
also looked at the idea of an idler shaft to carry out the final
drive reduction in two steps, but then you need plate wheels
smaller than available or driver sprockets bigger than
available. This is proving to be more challenging than I
imagined!
#Post#: 12058--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: TomFDS Date: December 2, 2024, 9:23 am
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All the sprockets are “large,” if you are seeking 7:1 vs more
common kart gearing. Remember that you are not looking at large
rotational mass vs say the flywheel of most cars, which is a lot
closer to the driver than many people appreciate. A chain guard
or substantial seat back will protect you from the unlikely
event of sprocket disintegration. The kids on the farm where my
workshop is have abused many kids quads/go karts over the years
and not broken a sprocket, which has been my safety measure!
#Post#: 12059--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: NewbieNick Date: December 2, 2024, 11:23 am
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Hi Ade, my MG has a 60 tooth 420 sprocket with a 9 tooth drive
sprocket giving 6.6 -1.
It goes pretty well with that ratio despite being a very heavy
kart.
The Marmon Wasp I am building will have 219 chains & sprockets
but also a Jackshaft allowing near infinite ratios.
#Post#: 12061--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: Ade Colmar Date: December 2, 2024, 2:08 pm
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Hi Nick,
I would be interested to know more about your planned #219 jack
shaft based final drive.
From what I have found so far the Gemini Karts 15 tooth sprocket
is the biggest drive sprocket and the driven #219 plate wheels
don't seem to come smaller than about 63 teeth (giving a ratio
of 4.2:1). An overall final drive of 7:1 is two times 2.65:1 so
smaller driven plate wheels would be needed.
#Post#: 12062--------------------------------------------------
Re: Does anyone use #219 sprockets and chain?
By: NewbieNick Date: December 2, 2024, 11:29 pm
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Hi Ade, as far as I’m aware Geminis 15 tooth drive sprocket is
the only option for 219 You can get a 60 tooth driven sprocket
from Talon(not that it helps much). The largest driven is 99
giving 6.6-1 so that’s your lot using 219 & 2 sprockets.For this
reason I’m using a Jackshaft allowing lots of ratios by changing
1 sprocket & chain.Theres a picture of it so far in the New
build Marmon Wasp build journal on this forum. The set up in the
picture is
15 drive, 90 Jackshaft in,63 Jackshaft out & 99 rear axle
giving 9.4-1 changing the Jackshaft in to a 70 tooth gives a
7.3-1 final drive. Hope that makes sense.
Cheers Nick
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