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BRITISH COLUMBIA CLASSIC MOTORCYCLE CLUB
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Author Topic: Ross’ 1975 CB750  (Read 46207 times)
Galactica
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« Reply #300 on: May 03, 2024, 07:43:49 PM »

Oh man. Don’t ask me to repeat the effort.  Not happy with it anyway. 
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Past rides:
75 Honda CB750K5
80 Suzuki TS250
 ? Yamaha Maxim 550
73 Z1 900
76 Kz900 A1
77 Kz1000 A1
78 Kz1000 B2 Ltd
79 Kz1000 B3 Ltd
80 Kz1000 C
99 Triumph Tiger 900
84 Honda VF750 Interceptor
77 Honda CB750


Current ride:
2019 Yamaha Tracer900

Current project:
1975 Honda CB750K5
Twisted_Twin
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15/16ths of the world uses the metric system.


« Reply #301 on: May 04, 2024, 06:42:45 PM »

Looking great Ross! Well done!
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It's important to feel comfortable in your own skin because it's illegal to wear someone else's.
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« Reply #302 on: May 11, 2024, 07:06:28 PM »

So, yesterday I took the CB750 out for its first real shakedown ride.  Roy and I rode out to Agassiz.  There was a fellow out there who was selling a Dyna electronic ignition for $35.  I reckoned if it’s in working order, that’s a pretty good deal.  In any case it was a good reason to get my ass out for a ride. 

We headed out on the freeway.  I wanted to run it at speed and temperature to burn off the moisture that has been in the crankcase since I started it.  The bike ran well, as I expected.  An issue that’s become very apparent is the amount of effort it takes to turn the throttle.  It was an inordinate amount.  I’d only run it about 100 miles around town at this point.  I put it down to an overly strong carb return spring.  But as our ride progressed, the wrist twisting effort became greater, and the throttle seemed to catch and bind upon input.  Hmmm.

So this evening I pulled the tank and disconnected the throttle cables.  The return spring seemed absolutely fine when actuated be hand.  Hmmm.  The pull cable seemed a bit catchy though.  I opened up the right hand switch block to access the throttle grip tube.  Disconnected and inspected the cables there.  Really odd.  On the pull cable, the inner sheath had been pulled up and was wrapping along with the cable around the throttle tube.  Apparently, somehow the sheath has been pulled from inside the cable housing.  I pushed the inner sheath back down out of the way and applied some 3in1 oil.  Reconnected the cables to the carbs.  Feels great.  Now, if the issue reoccurs, I’ll have to replace the cable.  Cheap Chinese sh*t. 

Another small issue I noticed was a catch when I applied the rear foot brake.  I found that I had the upper bolt of the brake torque arm installed the wrong way.  The threaded end was catching on the actuator rod.  I removed the bolt, flipped it around so the threaded end was the other way.  Clearance achieved. 

These operations were performed under the influence of wine with dinner and bourbon afterwards.  So I’ll not be testing my repairs this evening.  That’ll wait until the ride to coffee at the Fort tomorrow.
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Past rides:
75 Honda CB750K5
80 Suzuki TS250
 ? Yamaha Maxim 550
73 Z1 900
76 Kz900 A1
77 Kz1000 A1
78 Kz1000 B2 Ltd
79 Kz1000 B3 Ltd
80 Kz1000 C
99 Triumph Tiger 900
84 Honda VF750 Interceptor
77 Honda CB750


Current ride:
2019 Yamaha Tracer900

Current project:
1975 Honda CB750K5
Hawkeye
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If you can't get one, make one.


« Reply #303 on: May 11, 2024, 08:28:10 PM »

Ross, when I put a Dyna on my '77 CB750 some years ago, it was $180. I'd say you did well.
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Mike
___________________________________

Past: '77 Honda 400 Four Super Sport
        '79 Honda 750K
        Honda CT70
        '78 XS400
        '81 Honda GL1100 (Collector Plate) (x2)
Present: '66 Honda CT200 Trail 90
             '77 Honda 750 Four K
             '83 Honda GL1100 (Collector Plate)
             '83 Honda 750 Shadow (Collector Plate)
Future: '77 Honda 400 Four Super Sport
Steve G.
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« Reply #304 on: May 11, 2024, 08:44:40 PM »



  50 year old cables tend to act like 50 year old cables.
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Garage Residents:
'74 Honda CT70
'74 Norton 850 Interstate
'81 Laverda Jota Mk11 180
'89 Honda RC30
'91 BMW R100GS
'08 Honda XR650L
'08 BMW R1200GS

Previous Garage Residents
 1966 Keystone Tas 50
 1981 Can-Am 250 MX6
 1966 BSA 250 Starfire
 1972 Triumph 650 hardtail chopper
 1976 Honda 400-4 Supersport
 1982 Can-Am 500 Sonic
 1982 Suzuki SP500
 1984 Kawasaki KZ 750 L4
 1979 Honda CBX
 1988 Ducati 750 Paso 750 Euro
 1972 Suzuki 750 GT ‘Kettle’
 1972 Kawasaki 750 H2
 1993 BMW R100GSPD
 1984 Honda CR500
 1979 Honda CBX sandcast
 1975 Honda 400-4 SS
 2001 Moto Guzzi V11 Sport
 2006 Yamaha FJR 1300
1972 Norton Combat Roadster 810
 1972 BMW R75/2 SWB
 1980 Honda CBX
 1970 Honda Trail 50 K1
Galactica
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« Reply #305 on: May 11, 2024, 09:20:36 PM »



  50 year old cables tend to act like 50 year old cables.

These are new aftermarket cables.
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Past rides:
75 Honda CB750K5
80 Suzuki TS250
 ? Yamaha Maxim 550
73 Z1 900
76 Kz900 A1
77 Kz1000 A1
78 Kz1000 B2 Ltd
79 Kz1000 B3 Ltd
80 Kz1000 C
99 Triumph Tiger 900
84 Honda VF750 Interceptor
77 Honda CB750


Current ride:
2019 Yamaha Tracer900

Current project:
1975 Honda CB750K5
Twisted_Twin
BCCMC Star (5K)
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Posts: 6407


15/16ths of the world uses the metric system.


« Reply #306 on: May 12, 2024, 08:02:42 AM »

My LeMans has a Dyna ignition, you'll love it.

Coils are a bit spendy if you need to replace them but well worth it in the long run.

Glad you're getting it sorted out.
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It's important to feel comfortable in your own skin because it's illegal to wear someone else's.
kilowop
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« Reply #307 on: May 12, 2024, 01:59:46 PM »

Glad you're making progress on the old girl. I have a habit of lubing the various cables each spring, prior to the first ride. Worked well, so far.  Over the years I've accumulated a box full of good used cables, throttle, choke, etc.  Even have a number of Hydraulic Brake lines I've rescued. If anyone needs something like that contact me with details.  It will only cost you the mailing fee.
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Current rides:                                                      
 2022 Suzuki V-Strom 650                                                         




 
"SOME" PAST RIDES: In no particular order
51 Matchless 500 single      53 AJS 500 single
62 Triumph T-100SS          57 Triumph T-100R
66 Norton N-15 - 750 Scrambler
68 Honda CB 450               68 Honda CB-250
69 Honda CL 450               71 Suzuki 350
73 Suzuki GT-550 Triple      71(?) Honda SL-350
73 Honda XL-250               76 Honda CB-400F
77 Yamaha XS 500             80 Suzuki GS-550E
81 Suzuki GS-750E             81 Suzuki GS1100E           
81 Honda CB-900C
with Hondaline Tour Pak     '02 Honda CB-900F(Hornet 919)
'90 Honda ST-1100 (collector status)
'83 Suzuki GS-750 T  (collector status)        '82 Suzuki GS-550 Katana
'80 Suzuki GS-850 G          '80 Suzuki GS-1000G(collector status)
'06-Suzuki DL-650 V-Strom     '81 Suzuki GS-550 "T" (collector status)
2009 Suzuki Burgman 650 Mega Scooter 
'82 Yamaha Seca 650
'07 Yamaha FJR-1300         82 Suzuki GS-850G-Collector status
'86 Suzuki GS-400ES          82 Suzuki GS-650GL-Collector status
'79 Honda CBX                  82 Suzuki GS-650-G-Collector status
'81 Honda CBX (x2)           82 Honda 450 Hawk
98 Triumph Trophy 900     06 Kawasaki Concours
'05 Suzuki Burgman 650(Super Scooter)
2018 Suzuki Burgman Executive 650 Scooter
Galactica
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« Reply #308 on: May 15, 2024, 09:33:47 PM »

Ok.  So I’ve ridden the bike about 300 miles.  Today my grandson had a baseball game that I attended.  When I left my garage, cold engine, I noticed a slight shudder as I engaged the clutch.  Hmmm.  I stopped and started again. No issue, so I went to the game.  All seemed fine until I approached the parking lot.  Leaving a stop sign, a pretty significant shudder upon clutch engagement.  Damn.  On the way home it occurred again with an accompanying significant rattle, which could have been the engine complaining about it.  I’ve not felt this kind of shudder anytime in the past.

Should I just go ahead and replace the plates, discs, and springs?  Are the parts at Vintage CB750 good quality?  I guess I’ll need the special tool as well.

Please chime in.

Cheers
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Past rides:
75 Honda CB750K5
80 Suzuki TS250
 ? Yamaha Maxim 550
73 Z1 900
76 Kz900 A1
77 Kz1000 A1
78 Kz1000 B2 Ltd
79 Kz1000 B3 Ltd
80 Kz1000 C
99 Triumph Tiger 900
84 Honda VF750 Interceptor
77 Honda CB750


Current ride:
2019 Yamaha Tracer900

Current project:
1975 Honda CB750K5
Steve G.
1000 Class
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« Reply #309 on: May 15, 2024, 09:42:39 PM »



  Been a while since I replaced a wet multiplate clutch, a year ago. New gasket, 10mm socket, new friction plates and clutch discs, proper torque specs for the 7-9 bolts to torque it down. I’ve never replaced the springs.
 What viscosity of oil you running?
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Garage Residents:
'74 Honda CT70
'74 Norton 850 Interstate
'81 Laverda Jota Mk11 180
'89 Honda RC30
'91 BMW R100GS
'08 Honda XR650L
'08 BMW R1200GS

Previous Garage Residents
 1966 Keystone Tas 50
 1981 Can-Am 250 MX6
 1966 BSA 250 Starfire
 1972 Triumph 650 hardtail chopper
 1976 Honda 400-4 Supersport
 1982 Can-Am 500 Sonic
 1982 Suzuki SP500
 1984 Kawasaki KZ 750 L4
 1979 Honda CBX
 1988 Ducati 750 Paso 750 Euro
 1972 Suzuki 750 GT ‘Kettle’
 1972 Kawasaki 750 H2
 1993 BMW R100GSPD
 1984 Honda CR500
 1979 Honda CBX sandcast
 1975 Honda 400-4 SS
 2001 Moto Guzzi V11 Sport
 2006 Yamaha FJR 1300
1972 Norton Combat Roadster 810
 1972 BMW R75/2 SWB
 1980 Honda CBX
 1970 Honda Trail 50 K1
Bucko
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« Reply #310 on: May 15, 2024, 11:23:25 PM »

In all the clutches I've ever replaced (or had out for other maintenance reasons) over the years, not once have I ever found a single metal clutch plate out of OEM spec.  I've replaced the clutch diaphragm spring on both my Vulcans (those springs are a known weak point that lead to clutch slipping).  In both cases, even the fibre plates measured well within spec.
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hardrockminer
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« Reply #311 on: May 16, 2024, 03:59:20 AM »

I've never had a fibre plate measure less than the spec.  And I've never had a steel plate appear warped.  But I've had a couple of cracked or broken fibre plates.  I've replaced the springs on several clutches but not the big springs on the inner hub.  I don't have the tools to change those.
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Past rides include a 1973 Suzuki GT380 & a 1975 Kawasaki Z1B

I currently ride a 1975 Kawasaki Z1B - Classic Plated
I also ride a 1980 Kawasaki KZ 1000 LTD - Classic Plated, and a 2006 Honda Goldwing with a Daytona 2+2 sidecar

My Sweetums rides a 2019 Suzuki DR650
rz5mark
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« Reply #312 on: May 16, 2024, 05:18:24 AM »

Be sure the hub bearing or bushing is in good shape.
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Galactica
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« Reply #313 on: May 16, 2024, 08:26:28 AM »

Ya, I laid awake much of last night with it going through my mind.   I actually am fairly certain it’s not the clutch.  It reminds very much of the KZ1000 LTD I did.  The dogs and slots on a couple of transmission gears were worn and it jumped out of gear under load. 

I posted on the SOHC forum.  It was suggested that there’s an Allen screw on the end of the shift barrel that holds on the gear shift side plate that has possibly come loose.  Have to pull off the left side transmission cover to check.  Requires having a new gasket on hand.  I’ll order one today.  I’ll see if they’re available at Honda.  I’m sure hoping I don’t have to split the cases. 
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Past rides:
75 Honda CB750K5
80 Suzuki TS250
 ? Yamaha Maxim 550
73 Z1 900
76 Kz900 A1
77 Kz1000 A1
78 Kz1000 B2 Ltd
79 Kz1000 B3 Ltd
80 Kz1000 C
99 Triumph Tiger 900
84 Honda VF750 Interceptor
77 Honda CB750


Current ride:
2019 Yamaha Tracer900

Current project:
1975 Honda CB750K5
Galactica
1000 Class
******
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Posts: 4630



« Reply #314 on: May 16, 2024, 10:20:51 AM »

Left side transmission/shifter cover gasket ordered.  Hopefully it will be here end of next week.
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Past rides:
75 Honda CB750K5
80 Suzuki TS250
 ? Yamaha Maxim 550
73 Z1 900
76 Kz900 A1
77 Kz1000 A1
78 Kz1000 B2 Ltd
79 Kz1000 B3 Ltd
80 Kz1000 C
99 Triumph Tiger 900
84 Honda VF750 Interceptor
77 Honda CB750


Current ride:
2019 Yamaha Tracer900

Current project:
1975 Honda CB750K5
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