So I picked up this frame and an old 8hp Briggs engine. The frame came set up with 2 sprockets with a chain already on it. What I'm needing to know, is how to find out what type of Clutch I need to get, (what type of chain fits to it that is) and what type of chain and what length I need. Was told that sometimes you can find what type of sproket it is by writing on it, but found none. Any help to this newb builder would help.
Chain Question
- Thread starter mayhem17
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Doc Sprocket
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Measure the chain from one link pin to the next. 3/8"=#35, 1/2"=#40/41, 5/8"=#50. There are more variants, but this will put you in the ballpark.
Is there an existing clutch?
Is there an existing clutch?
jrmints1415
New member
if you have a bike then try to put a few links from the bike chain on the sprocket. bike chain is usually #35 pitch, but if it doesn't fit (to small) then you will most likely have #40/41 chain (recommended #40 on most go karts). correct me if im wrong toystory because chain is not my strongest 
Doc Sprocket
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#41 is thinner (and weaker) than #40. I apologize, I don't have the specs handy, and thanks to a wicked head cold, I can't think straight either.
Once you've sorted out the chain type, measure the diameter of the engine's crankshaft, likely 3/4", possibly 1".
Can you put up a couple of pics?
Once you've sorted out the chain type, measure the diameter of the engine's crankshaft, likely 3/4", possibly 1".
Can you put up a couple of pics?
Best pic I have of the sprokets at this time. As you see, there are 2 different sprockets on the axle side by side. The guy I got it from said that they used the same chain for each. Haven't put the chain on both yet and measured how high it reaches to verify this yet. Snow just finally melted enough for me to get in my shed today
There is a chain on it, so will measure it tomorrow.
I did measure the shaft, it is a 1''.
Doc Sprocket
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ANSI B29.1 roller chain standard sizes
Size Pitch Roller diameter Tensile strength Working load
25 0.25 in (6.35 mm) 0.13 in (3.30 mm) 781 lb (354 kg) 140 lb (64 kg)
35 0.375 in (9.53 mm) 0.2 in (5.08 mm) 1,758 lb (797 kg) 480 lb (220 kg)
41 0.5 in (12.70 mm) 0.306 in (7.77 mm) 1,500 lb (680 kg) 500 lb (230 kg)
40 0.5 in (12.70 mm) 0.312 in (7.92 mm) 3,125 lb (1,417 kg) 810 lb (370 kg)
50 0.625 in (15.88 mm) 0.4 in (10.16 mm) 4,880 lb (2,210 kg) 1,430 lb (650 kg)
60 0.75 in (19.05 mm) 0.469 in (11.91 mm) 7,030 lb (3,190 kg) 1,980 lb (900 kg)
Size Pitch Roller diameter Tensile strength Working load
25 0.25 in (6.35 mm) 0.13 in (3.30 mm) 781 lb (354 kg) 140 lb (64 kg)
35 0.375 in (9.53 mm) 0.2 in (5.08 mm) 1,758 lb (797 kg) 480 lb (220 kg)
41 0.5 in (12.70 mm) 0.306 in (7.77 mm) 1,500 lb (680 kg) 500 lb (230 kg)
40 0.5 in (12.70 mm) 0.312 in (7.92 mm) 3,125 lb (1,417 kg) 810 lb (370 kg)
50 0.625 in (15.88 mm) 0.4 in (10.16 mm) 4,880 lb (2,210 kg) 1,430 lb (650 kg)
60 0.75 in (19.05 mm) 0.469 in (11.91 mm) 7,030 lb (3,190 kg) 1,980 lb (900 kg)
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