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BRITISH COLUMBIA CLASSIC MOTORCYCLE CLUB
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Ross’ 1975 CB750
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Author
Topic: Ross’ 1975 CB750 (Read 25677 times)
Galactica
1000 Class
Offline
Posts: 4486
Re: Ross’ 1975 CB750
«
Reply #315 on:
May 16, 2024, 04:18:12 PM »
So having the gasket on order, I decided to open up the transmission cover. Mine is a #3 cross head not Allen head. Tight as can be. Dang. Now I’m thinking the worst. Splitting cases and sourcing transmissions/parts.
Logged
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
kilowop
1000 Class
Offline
Posts: 2080
Re: Ross’ 1975 CB750
«
Reply #316 on:
May 16, 2024, 10:02:15 PM »
Having occasionally had similar situation arise, I was advised to push it over a cliff and declare it stolen.
Logged
Current rides:
2022 Suzuki V-Strom 650
'81 Suzuki GS-550 "T" (collector status)
2009 Suzuki Burgman 650 Mega Scooter
"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
'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
hardrockminer
BCCMC Star (5K)
Offline
Posts: 5398
Re: Ross’ 1975 CB750
«
Reply #317 on:
May 17, 2024, 03:52:30 AM »
That would be JIS crosshead? I use impact screwdrivers if they are tight.
Logged
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
Steve G.
1000 Class
Offline
Posts: 4290
Re: Ross’ 1975 CB750
«
Reply #318 on:
May 17, 2024, 05:45:44 AM »
I’m assuming you mean Ohillips head rather than cross head Ross?
Your entire motorcycle is fastened together with JIS head screwdriver heads. I strongly suggest getting all 3 different sized heads at Princess Auto. You may need to buy a multi head tip mini box.
Vessel JIS screwdrivers are the best made .
Logged
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
1976 Honda 400-4 Supersport
1982 Can-Am 500 Sonic
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 Z50
Galactica
1000 Class
Offline
Posts: 4486
Re: Ross’ 1975 CB750
«
Reply #319 on:
May 17, 2024, 06:30:11 AM »
Ya, it’s JIS. Thought I’d push some buttons.
The screw was staked at the factory and you can see it hasn’t moved. I thought it would be too good to be true. So I’ll get the gasket and ride it a bit more maybe, to try a get a definitive diagnosis. But I’m pretty sure I’m looking for a transmission or parts there of.
Logged
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)
Offline
Posts: 6389
15/16ths of the world uses the metric system.
Re: Ross’ 1975 CB750
«
Reply #320 on:
May 17, 2024, 07:02:41 AM »
A trick from the Bevel Ducati guys that I found when I was trying to get the clutch in my 860 to stop slipping (it worked) .
Those clutch plates probably sat dry and stuck together for a long time.
Before spending a pile of money on transmission parts, I'd try pulling the clutch friction discs out and soaking them overnight in some ATF.
Transmission fluid has friction modifiers in it that are specifically for wet clutches. Engine oil doesn't have this and since it's a unit engine....
Won't cost much and beats tearing down the transmission.
Logged
It's important to feel comfortable in your own skin because it's illegal to wear someone else's.
Steve G.
1000 Class
Offline
Posts: 4290
Re: Ross’ 1975 CB750
«
Reply #321 on:
May 17, 2024, 07:26:08 AM »
JASO MA and JASO MA2 rated engine oils both have specific additives for wet clutch operation, and longer chain molecules for gearbox operation.
Ross, are you concerned that you may have a bent shifter fork?
Logged
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
1976 Honda 400-4 Supersport
1982 Can-Am 500 Sonic
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 Z50
Galactica
1000 Class
Offline
Posts: 4486
Re: Ross’ 1975 CB750
«
Reply #322 on:
May 17, 2024, 07:44:51 AM »
Could be a bent shifter fork. Most likely if a fork is bent, it’s because the dogs and ears are worn, then the gears slip apart and bend the fork. One problem causing the other, I’m thinking.
Logged
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
Offline
Posts: 4290
Re: Ross’ 1975 CB750
«
Reply #323 on:
May 17, 2024, 07:50:29 AM »
Splitting the cases should not be taken lightly!!
Logged
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
1976 Honda 400-4 Supersport
1982 Can-Am 500 Sonic
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 Z50
Galactica
1000 Class
Offline
Posts: 4486
Re: Ross’ 1975 CB750
«
Reply #324 on:
May 17, 2024, 08:04:41 AM »
Shawn, the clutch has been working fine. It’s possible that it is to blame. That would be an easy fix. It doesn’t slip so much as chunk and juddder, and not all the time. When I get the transmission cover gasket, I’ll ride it some more. It could well be the clutch. That would be my hope, but I’ll do some research in the meantime.
Steve, splitting the cases is the last resort. I’ll certainly exhaust all other options first.
Logged
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
hardrockminer
BCCMC Star (5K)
Offline
Posts: 5398
Re: Ross’ 1975 CB750
«
Reply #325 on:
May 18, 2024, 03:53:15 AM »
Another check before splitting the cases....drop the oil pan to see if there are any metal bits in there.
Logged
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
Galactica
1000 Class
Offline
Posts: 4486
Re: Ross’ 1975 CB750
«
Reply #326 on:
May 20, 2024, 09:43:16 AM »
The shift cover gasket will be here hopefully by the end of the week. At least then I can ride it a bit more to see what’s going on.
In the meantime, since I’d have to order a clutch cover gasket just to access the clutch discs, I placed another order. I ordered gasket, clutch removal tool, friction discs, springs, tab washer. And some rubber parts for neighbour’s bike. Should be here in a couple of weeks.
Logged
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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