clutch needed

B

bestmike

New Member
#1
#1
I'm creating a mini bike out of old bike and go-kart parts that broke and couldn't be fixed. I'm using a briggs flathead 3.5hp motor. I need a 3/4" clutch that uses bicycle chain.

from my research a bicycle chain is: 1/2" pitch, .306" roller diameter, 1/8" roller width.
i believe that's a #410 chain size.

which one of these CENTRIFUGAL CLUTCH's would work?:
in the next post

thanks in advanced!!!!

[FYI my friends and i have a competition going on, building the fastest mini bike out of junk parts and max limit of $50]
 
B

bestmike

New Member
#2
#2
some reason this forum wont let me post links...

both clutch are on ebay just search for these:

CENTRIFUGAL CLUTCH 3/4" BORE #40/41 CHAIN 10T FOR GO KART MINI BIKE ENGINE

Max Torque Clutch 3/4" Bore 40,41,410 Chain,10-Tooth Replaces Comet 209768A
 
Harleys Papa

Harleys Papa

#3
#3
Welcome to the Madness bestmike :doah: I mean forum :thumbsup: Yes that should work, where are you in Ct? I have one of those clutchs and I can give you a good deal on it :thumbsup:
 
bikebudy

bikebudy

Banned - Must pay $500
#6
#6
•20 x 1/8" (0.125", 3.18 mm) chain is used on most single-speed bicycles, and bicycles with internal gearing.

•20 x 3/32" (0.094", 2.30 mm) chain is used on derailer equipped bicycles that have more than 3 cogs at the rear.

Most mini bikes use #35 chain, more heavy duty rigs use 41/40.



You will find a bicycle chain clutch BUT, not with a 3/4 bore for the crank.

I used regular mini bike clutch, chain and gear on jack shaft, then welded a bicycle gear to a #35 sprocket
for the other side of the jackshaft. Then ran my 20 x 1/8 bicycle chain.

As far as I know this is the only way you will pull off using a 3/4 shaft engine to power a bicycle sprocket.

I could be wrong, but I did a lot of research on this when I did my build.
 
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bikebudy

bikebudy

Banned - Must pay $500
#9
#9
So you may as well tell him to pull the governor, don't bother to change the flywheel an connecting rod. ??

Bicycle Chain
Pitch 1/2" = 1.27"
Roller Dia 0.129"
Roller Width 0.401"


#41
Pitch 1/2 = 1.27"
Roller Dia .306"
Roller Width 1/4" = 6.35"


#40
Pitch 1/2" = 1.27"
Roller Dia 5/16" = 7.93"
Roller Width 5/16" = 7.93"

its not the same
 
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minibikin'

minibikin'

Sho-nuff
#10
#10
You said not even close. I said same pitch different width. I didn't say I would do it or recommend it...


Sent from my Texas Instruments Speak and Spell...[emoji2]
 
bikebudy

bikebudy

Banned - Must pay $500
#11
#11
Just making a comment, it was not directed to anyone.

The difference is just over 1/8"th of an inch wider 3.175".

Chains are not super tight and already have give, so its actually more that a 1/8th of a inch side to side play/
never mind the roller size.

I don't know all, I just looked it up.
 
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