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Low gear part numbers - 23420-253-000 vs 23420-253-020

Clutch, Transmission, Drive Chain, Sprockets
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Bob750
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Low gear part numbers - 23420-253-000 vs 23420-253-020

Post by Bob750 » Sat Mar 02, 2013 3:20 am

Can anyone tell me the difference between the two parts above? (Gear, Low 35T)

The dogs on mine are rounded, and while looking up the part I found Honda used 2 part numbers. My '64 CA has engine CA77E-1056xx (frame CA78-1056xx) and so would use the earlier -000 part (manual says it's used through CA77E-1033686 with the -020 part used after that), but I want to know if there's a way to tell them apart from photos I see on the web. Also, are they interchangeable? I've seen someone selling a -000 part that "came off a 1969 CA77" so it's either a mistake or someone had swapped the original tranny for an older model. Right?

Bob

LOUD MOUSE
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Re: Low gear part numbers - 23420-253-000 vs 23420-253-020

Post by LOUD MOUSE » Sat Mar 02, 2013 10:44 am

As near as I know they are the same as for installation and working with the other gears. ..........lm
Bob750 wrote:Can anyone tell me the difference between the two parts above? (Gear, Low 35T)

The dogs on mine are rounded, and while looking up the part I found Honda used 2 part numbers. My '64 CA has engine CA77E-1056xx (frame CA78-1056xx) and so would use the earlier -000 part (manual says it's used through CA77E-1033686 with the -020 part used after that), but I want to know if there's a way to tell them apart from photos I see on the web. Also, are they interchangeable? I've seen someone selling a -000 part that "came off a 1969 CA77" so it's either a mistake or someone had swapped the original tranny for an older model. Right?

Bob

48lesco
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Post by 48lesco » Sat Mar 02, 2013 6:16 pm

The difference might only be in the forging/machining on the side with the dogs. I have a good used one I just relisted on ebay for $10 if you're interested.

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Bob750
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Re: Low gear part numbers - 23420-253-000 vs 23420-253-020

Post by Bob750 » Sun Mar 03, 2013 1:09 am

Thank you, Ed!
LOUD MOUSE wrote:As near as I know they are the same as for installation and working with the other gears. ..........lm
Bob750 wrote:Can anyone tell me the difference between the two parts above? (Gear, Low 35T)

The dogs on mine are rounded, and while looking up the part I found Honda used 2 part numbers. My '64 CA has engine CA77E-1056xx (frame CA78-1056xx) and so would use the earlier -000 part (manual says it's used through CA77E-1033686 with the -020 part used after that), but I want to know if there's a way to tell them apart from photos I see on the web. Also, are they interchangeable? I've seen someone selling a -000 part that "came off a 1969 CA77" so it's either a mistake or someone had swapped the original tranny for an older model. Right?

Bob

LOUD MOUSE
honda305.com Member
Posts: 7817
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: Low gear part numbers - 23420-253-000 vs 23420-253-020

Post by LOUD MOUSE » Sun Mar 03, 2013 8:43 am

You are welcome. .............lm
Bob750 wrote:Thank you, Ed!
LOUD MOUSE wrote:As near as I know they are the same as for installation and working with the other gears. ..........lm
Bob750 wrote:Can anyone tell me the difference between the two parts above? (Gear, Low 35T)

The dogs on mine are rounded, and while looking up the part I found Honda used 2 part numbers. My '64 CA has engine CA77E-1056xx (frame CA78-1056xx) and so would use the earlier -000 part (manual says it's used through CA77E-1033686 with the -020 part used after that), but I want to know if there's a way to tell them apart from photos I see on the web. Also, are they interchangeable? I've seen someone selling a -000 part that "came off a 1969 CA77" so it's either a mistake or someone had swapped the original tranny for an older model. Right?

Bob

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Bob750
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Joined: Wed Jun 27, 2012 6:41 pm
Location: Long Beach, CA

Post by Bob750 » Thu Mar 07, 2013 11:43 am

For some reason I never saw your reply. Thank you for the info/offer. I had already begun bidding on an NOS -020 part on eBay. I won and it should be here tomorrow or Sat. If I need a different one I'll contact you!
48lesco wrote:The difference might only be in the forging/machining on the side with the dogs. I have a good used one I just relisted on ebay for $10 if you're interested.
Mine: '74 CB750 K4 -- Hers: '64 CA78
Had: '75 CB550 K, '79 CT90

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