Author Topic: K4 repop right hand control switch has binding of the throttle tube  (Read 424 times)

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Offline newday777

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I was asked to install a new repop throttle switch control on a friend's K4 to replace the badly stained housing and bad starter button. He bought the switch, I believe from David Silver from the bubble wrap and label it had on it.
But the new housing binds the throttle tube when you tighten the screws as it should be, so much so the throttle won't turn. I've tried a couple of tubes and get the same results so it has to be in the housing slot where the tube resides or the casting being too short.
Anyone else run into this problem with a new repop switch?
Edit.... I just want to know if anyone else has run into this problem.
It's binding without the cables attached to the housing.
« Last Edit: October 22, 2023, 05:30:26 AM by newday777 »
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, 2 K4, 2 K6, 1 K8
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 dave500

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Re: K4 repop right hand control switch has binding of the throttle tube
« Reply #1 on: October 20, 2023, 03:26:12 AM »
id find the hang up,then decide if it just needs a little fine fettling like with a file or so?repro stuff may be not quite right but only a touch here or there makes it as good as genuine fit?

Offline newday777

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Re: K4 repop right hand control switch has binding of the throttle tube
« Reply #2 on: October 20, 2023, 03:33:16 AM »
id find the hang up,then decide if it just needs a little fine fettling like with a file or so?repro stuff may be not quite right but only a touch here or there makes it as good as genuine fit?
I didn't ask about making it work Dave. I asked if anyone else has run into this.
I've been trying to grind out the housing with a dremel....
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, 2 K4, 2 K6, 1 K8
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 dave500

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Re: K4 repop right hand control switch has binding of the throttle tube
« Reply #3 on: October 20, 2023, 03:40:09 AM »
ok cool,your on it then,sorry i couldnt answer your question directly.

Offline denward17

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Re: K4 repop right hand control switch has binding of the throttle tube
« Reply #4 on: October 20, 2023, 04:46:33 AM »
I just installed a switch on a K8 from vintagecb750 and did not have this issue.

Offline newday777

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Re: K4 repop right hand control switch has binding of the throttle tube
« Reply #5 on: October 20, 2023, 04:53:41 AM »
I just installed a switch on a K8 from vintagecb750 and did not have this issue.
K7/8 use different switch assembly.
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, 2 K4, 2 K6, 1 K8
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 PeWe

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Re: K4 repop right hand control switch has binding of the throttle tube
« Reply #6 on: October 20, 2023, 05:04:54 AM »
If there is contact with throttle cable "tubing", adjust them might help, grind alu housing not.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline newday777

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Re: K4 repop right hand control switch has binding of the throttle tube
« Reply #7 on: October 20, 2023, 05:11:17 AM »
If there is contact with throttle cable "tubing", adjust them might help, grind alu housing not.
Per
It is not the throttle cables. It is the throttle tube without the cables, contacting the housing top section. Without the cables on the housing.
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, 2 K4, 2 K6, 1 K8
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