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Author Topic: How not to repair a choke assembly  (Read 1453 times)

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Offline Merph

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How not to repair a choke assembly
« on: June 12, 2022, 03:51:24 AM »
Bought my CB750 K7 a few weeks ago, had trouble with starting so removed the carbs and found a very unusual may of repairing the choke.
I think its some sort of epoxy - or maybe just chewing gum - what was in the mind?
I have sourced a complete choke assembly from CMS in Holland, so a full strip down is next and replacement.

The starting problems were similar to other posts I've seen. Starts on full choke but will not tick over.
Changed the points, condensers and plugs......
Any pointers would be welcome
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Offline newday777

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Re: How not to repair a choke assembly
« Reply #1 on: June 12, 2022, 03:59:31 AM »
That looks like it might be a solder blob????
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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, 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 madmtnmotors

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Re: How not to repair a choke assembly
« Reply #2 on: June 12, 2022, 06:43:15 AM »
That is truly hideous. Some folks shouldn't be allowed anywhere near tools.

My experience with PD carbs:
http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248

An entire thread devoted to PD carbs:
http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
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TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Offline seanbarney41

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Re: How not to repair a choke assembly
« Reply #3 on: June 12, 2022, 07:59:57 AM »
When you try to install the spring that is supposed to be there, you might start to understand why that was done.
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If it works good, it looks good...

Offline Don R

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Re: How not to repair a choke assembly
« Reply #4 on: June 12, 2022, 12:57:37 PM »
 That makes me feel better about the wiring on my 76F. If I was paid flat rate for working on this turd I'd either starve or be there 120 hours a week.
 
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Offline Little_Phil

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Re: How not to repair a choke assembly
« Reply #5 on: June 13, 2022, 12:50:24 AM »
Quote from: seanbarney41 on June 12, 2022, 07:59:57 AM
When you try to install the spring that is supposed to be there, you might start to understand why that was done.
Absolutely!  Presume same as Pds on 77-78 550s.
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Offline Merph

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Re: How not to repair a choke assembly
« Reply #6 on: June 13, 2022, 12:36:05 PM »
Managed to get the carbs stripped today
The "Blob" was epoxy so not easy to remove.
On strip down found the needle valves have the length all set differently - is that right??
Also Carb #4 Throttle valve / Slider was sticking badly, showing signs of slight scoring. Can this be polished out??
All jets flushed with Carb Cleaner.
Then the grandkids came round so had to play different games.

Thanks for all your comments and suggestion, especially Madmtnmotors. great pictures, they will be extremely helpful.
CHEERS
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Offline Shtonecb500

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Re: How not to repair a choke assembly
« Reply #7 on: June 13, 2022, 09:36:28 PM »
lol.
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73/74'' CB500/550 resto-mod - sold
75' 750f 91' cbr f2 swap cafe - mock up
74' 750 chopper hardtail - complete - sold
74' CB750/836kit - Black mix & match - daily rider - always tweaking
71' cb500 K0 survivor - complete
71' K1 - CANDY GOLD/BROWN Winton kit - in process

Offline Merph

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Re: How not to repair a choke assembly
« Reply #8 on: June 14, 2022, 11:46:30 AM »
Managed to get the new choke link set fitted to the carbs today.
Used the pictures posted by "madmtsmotors" which was a massive help!

It was a bit intense to fit the springs but got there in the end.
Needed to grow a third hand, so used my wife instead to fit the screws in the operating shaft/flaps.

After lots of polishing, the #4 carb Throttle valve / Slider now moves freely.

Carbs are rebuilt and fitted on the bike.......big test tomorrow

Thanks again for all the messages / advice
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