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Author Topic: No one makes a 520 front sprocket for a 1976 CB750F?  (Read 815 times)

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Offline jmardy

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No one makes a 520 front sprocket for a 1976 CB750F?
« on: May 22, 2025, 08:26:34 PM »
I'm looking for a 17T front 520 pitch front sprocket and can't find one.
Cognito Moto make an offset one but I need a standard offset one.
Any ideas?
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Online grcamna2

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #1 on: May 22, 2025, 09:38:09 PM »
Quote from: jmardy on May 22, 2025, 08:26:34 PM
I'm looking for a 17T front 520 pitch front sprocket and can't find one.
Cognito Moto make an offset one but I need a standard offset one.
Any ideas?

Have you called Sprocket Specialists in UT. ?
1-800-782-8200
« Last Edit: May 22, 2025, 11:21:40 PM by grcamna2 »
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Offline Ozzybud

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #2 on: May 22, 2025, 09:39:21 PM »
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1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
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Offline newday777

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #3 on: May 22, 2025, 10:01:21 PM »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
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Offline Tracksnblades1

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #4 on: May 23, 2025, 02:15:26 PM »
Could just make a set….🤔
Take the difference off the inside of each sprocket to maintain original alignment..
And perhaps be a benefit when running an oversize rear tire with a chain guard…🤔
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Offline pekingduck

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #5 on: May 23, 2025, 04:13:21 PM »
520 sprockets are 1/8" narrower than 530.  Because front sprockets are hardened, you can't really turn them down - they have to be ground.  You could do it with an angle grinder, but would need to have the sprocket rotating while grinding for a uniform finish.
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Offline Tracksnblades1

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #6 on: May 23, 2025, 04:22:49 PM »
A ceramic insert will more than adequately cut the front sprocket, hardened or not…
An experienced machinist can probably do it with HSS and for sure with carbide…
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Offline bryanj

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #7 on: May 23, 2025, 07:01:43 PM »
Honda decided 530 wasnt strong enough and went 630 for the F2 so why go weaker, or do you enjoy welding crankcases
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Offline jmardy

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #8 on: May 23, 2025, 07:04:59 PM »
You’re really saying a modern 520 chain can’t handle the amazing torque of a SOHC 750?
My rear wheel doesn’t have a 530 sprocket option.
I’ll take my chances.
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Online scottly

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #9 on: May 23, 2025, 07:24:26 PM »
IIRC, Honda used the same spline on other models. I think the '79-'82 XR/XL 500s used a 520 chain, but I don't know if any 17 tooth sprockets were offered for the dual purpose bikes.
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Online scottly

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #10 on: May 23, 2025, 07:56:46 PM »
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Don't fix it if it ain't broke!
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Online Don R

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #11 on: May 23, 2025, 08:46:38 PM »
  Modern 520 chain sets are holding up on 200 HP bikes, chains have come a long way since the 1969 case breakers.
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Offline jmardy

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #12 on: May 29, 2025, 01:25:21 PM »
Thanks for the Sprocket Specialists referral.
Talked to Lance and he hooked me up!
👍🏻
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Online grcamna2

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Re: No one makes a 520 front sprocket for a 1976 CB750F?
« Reply #13 on: May 29, 2025, 02:23:12 PM »
Quote from: jmardy on May 29, 2025, 01:25:21 PM
Thanks for the Sprocket Specialists referral.
Talked to Lance and he hooked me up!
👍🏻

I also recently ordered a 520 custom fr. sprocket.
I have a little Yamaha 250 that comes stock with a 530 Standard chain.
I want to go O-ring 520 and they had them.
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75' CB400F/'bunch o' parts'
  I love the small ones too !
Do your BEST...nobody can take that away from you.
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