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4th gear not there

Clutch, Transmission, Drive Chain, Sprockets
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G-Man
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Post by G-Man » Wed Jul 23, 2014 11:39 am

Woody

You're in a much better position to find the answer to that question than I am......

I rarely perform miracles, let alone at 3000 miles away.... :-)

You're going to have to look inside my friend.

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

woodrow
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Post by woodrow » Wed Sep 24, 2014 10:32 pm

I finally got the time to look in to my problem and discovered that I have a 13 tooth front drive sprocket which had me revved up so high going down the road that I thought I wasn't getting out of third gear. Can anyone tell me what the correct size forward drive sprocket I should be running on this 1966 305 scrambler? I know it has the shallow splines. Also what size sprocket belongs on the back? Anyone know where to locate these sprockets? I have read that the shallow forward sprockets are hard to find. Thanks Woody

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G-Man
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Post by G-Man » Thu Sep 25, 2014 2:24 am

Front 15T
Rear 40T

Ohio cycle has the front sprocket.

http://www.ohiocycle.com/catalog2.html

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

LOUD MOUSE
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Post by LOUD MOUSE » Thu Sep 25, 2014 6:36 am

A 15 tooth front and as you have a CL77 a 37 rear.
I may have the front. ............lm
woodrow wrote:I finally got the time to look in to my problem and discovered that I have a 13 tooth front drive sprocket which had me revved up so high going down the road that I thought I wasn't getting out of third gear. Can anyone tell me what the correct size forward drive sprocket I should be running on this 1966 305 scrambler? I know it has the shallow splines. Also what size sprocket belongs on the back? Anyone know where to locate these sprockets? I have read that the shallow forward sprockets are hard to find. Thanks Woody

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G-Man
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Post by G-Man » Thu Sep 25, 2014 10:54 am

'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

woodrow
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Posts: 16
Joined: Sat Feb 25, 2012 8:13 pm
Location: maryland

Post by woodrow » Thu Sep 25, 2014 6:58 pm

Thanks G man and Loud Mouse for the info, I think we got this problem solved

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G-Man
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Post by G-Man » Fri Sep 26, 2014 2:15 am

Woody

Depending on what sprockets you can find to purchase, 17/40 will give you a slightly higher gearing than 15/37. 16/40 will get you near standard gearing with non standard sprockets.


17 / 40 = 0.425
16 / 40 = 0.400

15 / 37 = 0.405

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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