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Author Topic: Clunky tranny in neutral engine off - video  (Read 318 times)

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Offline DHolbrook

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Clunky tranny in neutral engine off - video
« on: December 16, 2025, 04:29:02 PM »
Hi, this 1975 cb750 bike has 38k miles, just 2k my own.  Runs and shifts really smooth and no issues in and out of neutral, but then I observed clunking noises from the tranny while in neutral engine off.  Sounds off to me so I’m asking for advice.  I’ve changed the clutch disks a while ago but this sounds like gears and not clutch.  Clutch lever in our out no difference. Any help appreciated, thank you.

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« Last Edit: December 16, 2025, 04:30:35 PM by DHolbrook »
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Online newday777

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Re: Clunky tranny in neutral engine off - video
« Reply #1 on: December 16, 2025, 04:53:45 PM »
You chain is either too tight or worn out.
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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.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Online newday777

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  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
Re: Clunky tranny in neutral engine off - video
« Reply #2 on: December 16, 2025, 04:54:26 PM »
Try loosening the chain. Clean it and lube it.
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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.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline denward17

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Re: Clunky tranny in neutral engine off - video
« Reply #3 on: December 16, 2025, 07:24:07 PM »
Take off the trans cover and move the rear wheel again, sounds like the side of the chain rubbing against the engine case.
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Offline DHolbrook

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Re: Clunky tranny in neutral engine off - video
« Reply #4 on: December 17, 2025, 12:08:05 PM »
Chain issues sound better than tranny issues so I’m relieved and I will remove the sprocket cover and look for unusual wear.  I’ll likely replace the chain and sprockets soon. Thanks for the advice!
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Offline DHolbrook

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Re: Clunky tranny in neutral engine off - video
« Reply #5 on: December 19, 2025, 07:04:12 AM »
After putting more slack in the chain, cleaning and lubing it, the noise is gone, thank you for the help.
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Online newday777

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  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
Re: Clunky tranny in neutral engine off - video
« Reply #6 on: December 19, 2025, 07:23:19 AM »
Quote from: DHolbrook on December 19, 2025, 07:04:12 AM
After putting more slack in the chain, cleaning and lubing it, the noise is gone, thank you for the help.
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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.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A
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