luckyluckey
New member
Hi I was wondering if anyone could determine what size chain I need by looking at this pic of my sprocket.
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IMG_20150125_135213_1.jpg
chain size via sprocket (pics)
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Russ2251
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Nope.
Do you know how to use a measuring device, sometimes known as a ruler?
A caliper would be better.
Do you know how to use a measuring device, sometimes known as a ruler?
A caliper would be better.
colestreasures
New member
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chancer
ɔ ɥ ɐ u ɔ ǝ ɹ
A person can get a ruler if they first know the distance between teeth will equal what size chain. For example 3/8" between teeth= #35 chain etc.
chancer
ɔ ɥ ɐ u ɔ ǝ ɹ
Thanks Cole that is a great answer.
luckyluckey
New member
Thanks to the people who actually explained it.
in fact there's much more to it than just the pitch!
Let's just say you measured half an inch, that doesn't necessarily mean it's a #40 chain, it can be anything from a lousy bicycle chain over BMX chain, #41, #40 up to #428 motorcycle chain...
so, you need to get an idea of the sprocket width as well (that's why Russ mentioned a caliper I'd bet)
And to round it up perfectly, the diameter of the groove can point you in the direction of the size of the rollers..
and those three numbers, will together draw a perfect picture of the chain you want.
So yeah, that pic is a good starting point, but it's not more than that I'm afraid
And while it's true that on go karts it's pretty safe to assume a #40 or maybe a #41 chain to be used..
here are just a few other half inch chains commonly used:
#415 : 1/2 x 3/16 x 7,75mm Roller inner width: 4,76 mm = 3/16"
#420 : 1/2 x 1/4 x 7,75mm Roller inner width: 6,35 mm = 1/4"
#428 : 1/2 x 5/16 x 8,51mm Roller inner width: 7,94 mm = 5/16"
and of course 40 and 41 as a comparision
#41 : 1/2 x 1/4 X 7.77mm Roller inner width : 6,35 mm = 1/4"
#40 : 1/2 x 5⁄16 X 7.92mm Roller inner width : 7,94 mm = 5/16"
I think you get the idea
'sid
Let's just say you measured half an inch, that doesn't necessarily mean it's a #40 chain, it can be anything from a lousy bicycle chain over BMX chain, #41, #40 up to #428 motorcycle chain...
so, you need to get an idea of the sprocket width as well (that's why Russ mentioned a caliper I'd bet)
And to round it up perfectly, the diameter of the groove can point you in the direction of the size of the rollers..
and those three numbers, will together draw a perfect picture of the chain you want.
So yeah, that pic is a good starting point, but it's not more than that I'm afraid
And while it's true that on go karts it's pretty safe to assume a #40 or maybe a #41 chain to be used..
here are just a few other half inch chains commonly used:
#415 : 1/2 x 3/16 x 7,75mm Roller inner width: 4,76 mm = 3/16"
#420 : 1/2 x 1/4 x 7,75mm Roller inner width: 6,35 mm = 1/4"
#428 : 1/2 x 5/16 x 8,51mm Roller inner width: 7,94 mm = 5/16"
and of course 40 and 41 as a comparision
#41 : 1/2 x 1/4 X 7.77mm Roller inner width : 6,35 mm = 1/4"
#40 : 1/2 x 5⁄16 X 7.92mm Roller inner width : 7,94 mm = 5/16"
I think you get the idea
'sid
Poboy kartman
Senior Moments Member
colestreasures
New member
What I posted is just a start yes, but in most cases will get you what you need , I'm pretty sure you will state to wherever your getting it from that it's for s go kart. But yes there are so many different types of chains out there and you do want what fits.
Cole
Cole
See cole, and that's where the problem starts...
...wherever your getting it from...
Say the PO mounted a small motorbike engine to the kart (125cc honda) to build a shifter kart.. took the original honda sprockets and mounted them to the kart..
figured it's the wrong chassis for the kart, took his engine sold the rest..
420 or 428 chain for sure
turning to a OMB or BMI asking for a chain will end up in either a 41 or 40 chain of course (pitch, kartframe... hmmm)
the other way around.. have a nice kart, with a ordinary #40 sprocket, asking your local mobshop for a chain, stating it's for a kart, they will put a #420 on the counter and call it a day
(since it's used in atvs and even some karts)
They will sell what they carry, not necessarily what you need...
so whom to turn to if you're unsure?
.. right, the trusty caliper in your toolbox
'sid
...wherever your getting it from...
Say the PO mounted a small motorbike engine to the kart (125cc honda) to build a shifter kart.. took the original honda sprockets and mounted them to the kart..
figured it's the wrong chassis for the kart, took his engine sold the rest..
420 or 428 chain for sure
turning to a OMB or BMI asking for a chain will end up in either a 41 or 40 chain of course (pitch, kartframe... hmmm)
the other way around.. have a nice kart, with a ordinary #40 sprocket, asking your local mobshop for a chain, stating it's for a kart, they will put a #420 on the counter and call it a day
(since it's used in atvs and even some karts)
They will sell what they carry, not necessarily what you need...
so whom to turn to if you're unsure?
.. right, the trusty caliper in your toolbox
'sid
colestreasures
New member
Ok so the one question nobody has ask the OP is just exactly what type kart are you working on, pics would be nice and brand name too. Is it a factory built with original parts or is a custom build maybe using parts from different karts or atv or whatever it might be. Or is it plain and simple a from the ground up build starting with just a thought and maybe a few parts.
Cole
Cole
luckyluckey
New member
I liked that itsid and cole. It's a fox flyweight vintage go kart.
I have more pics on a different thread. I picked it up for 40.00
No motor or front right tire. I believe it has atv parts.
I have more pics on a different thread. I picked it up for 40.00
No motor or front right tire. I believe it has atv parts.
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ever so slightly oversized rear wheels, haven't you 
those will be a real pain to get moving, be sure to pick a nice gear ratio for those...
looks like they'll ask for something like 11:1 already,
that means either a massive rear sprocket, or a jackshaft, maybe even both
'sid
[EDIT]
oh yes.. I remember again.. that poor fox flyweight...
anyways.. what's the wheelsize? maybe we can figutre out what gearing you'd need and thus the sprocket will need to be replaced anyways *shrugs*
those will be a real pain to get moving, be sure to pick a nice gear ratio for those...
looks like they'll ask for something like 11:1 already,
that means either a massive rear sprocket, or a jackshaft, maybe even both
'sid
[EDIT]
oh yes.. I remember again.. that poor fox flyweight...
anyways.. what's the wheelsize? maybe we can figutre out what gearing you'd need and thus the sprocket will need to be replaced anyways *shrugs*
luckyluckey
New member
Here we go 22x11
see..
I think you will need a TC in the end I'm afraid..
even assuming a very lightweight kart and rider (total of 110kg ~242 lbs) with the
-what appears to be a 5hp briggs flatty-
you'll need a 12.8:1 ratio to not burn your clutch
with a TC you might get away with only 6.3:1 ratio ...
if it's an 8hp briggs, then a TC would work with a 5:1 ratio;
a cent clutch would still need 10.2:1 to not fail prematurely.
So yeah, those wheels are not actually working in your favour I'm afraid.
'sid
I think you will need a TC in the end I'm afraid..
even assuming a very lightweight kart and rider (total of 110kg ~242 lbs) with the
-what appears to be a 5hp briggs flatty-
you'll need a 12.8:1 ratio to not burn your clutch
with a TC you might get away with only 6.3:1 ratio ...
if it's an 8hp briggs, then a TC would work with a 5:1 ratio;
a cent clutch would still need 10.2:1 to not fail prematurely.
So yeah, those wheels are not actually working in your favour I'm afraid.
'sid
luckyluckey
New member
Hmm the kid I bought it off, had a 5hp, it ran pretty good. I'll check out out though. Thank you
yes.. the kid's dad I got my 5hp briggs kart from, claimed that kart was going 80km/h with three people (kids) on it
I believe it was three kids on the kart since the wheel bearings were shot (even cracked the casted rim...)
Anyways.. the gearing allowed for 50km/h...
(baaad gear ratio of 4:1)
it still pulled me up a serious inclination, but the clutch is now to be considered "toasted"
So the question is: have YOU driven the kart when you bought it?
The seller will be the least trustable source in most cases
So maybe I'm wrong and your clutch will survive, but top speed comes at a price, and with some gear ratios that's the price of a clutch
'sid
I believe it was three kids on the kart since the wheel bearings were shot (even cracked the casted rim...)
Anyways.. the gearing allowed for 50km/h...
(baaad gear ratio of 4:1)
it still pulled me up a serious inclination, but the clutch is now to be considered "toasted"
So the question is: have YOU driven the kart when you bought it?
The seller will be the least trustable source in most cases
So maybe I'm wrong and your clutch will survive, but top speed comes at a price, and with some gear ratios that's the price of a clutch
'sid
luckyluckey
New member
I didn't ride it but I've seen it ran.
Just more money I don't have to spend on it.
It's hard enough to find a front wheel, getting smaller rear wheels should be fun.
Just more money I don't have to spend on it.
It's hard enough to find a front wheel, getting smaller rear wheels should be fun.
BirdFanatic
New member
Get some hf wheels there 15 $ for the rim and wheel at least you dont have to pay 20$ a wheel for just the tire (Rubber only)
luckyluckey
New member
Where could I get them at?
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