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BRITISH COLUMBIA CLASSIC MOTORCYCLE CLUB
19808
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Ross’ 1975 CB750
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Author
Topic: Ross’ 1975 CB750 (Read 46847 times)
Wheels
1000 Class
Offline
Posts: 4301
Re: Ross’ 1975 CB750
«
Reply #345 on:
September 05, 2024, 06:55:33 PM »
Looks very good!
Logged
Hawkeye
1000 Class
Offline
Posts: 1546
If you can't get one, make one.
Re: Ross’ 1975 CB750
«
Reply #346 on:
September 05, 2024, 08:25:50 PM »
Definitely has classic lines.
Logged
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
hardrockminer
BCCMC Star (5K)
Offline
Posts: 5626
Re: Ross’ 1975 CB750
«
Reply #347 on:
September 06, 2024, 02:09:04 AM »
Yes, very nice Ross! You did a great job!
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
Twisted_Twin
BCCMC Star (5K)
Offline
Posts: 6412
15/16ths of the world uses the metric system.
Re: Ross’ 1975 CB750
«
Reply #348 on:
September 06, 2024, 07:05:31 AM »
Beautiful as always.
Good job Ross, well done.
Logged
It's important to feel comfortable in your own skin because it's illegal to wear someone else's.
Galactica
1000 Class
Offline
Posts: 4637
Re: Ross’ 1975 CB750
«
Reply #349 on:
September 06, 2024, 10:38:20 AM »
Thanks guys. Hopefully I’ll be able to ride by spring.
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: 2113
Re: Ross’ 1975 CB750
«
Reply #350 on:
September 06, 2024, 12:22:34 PM »
Always great to see a "CLASSIC" rejuvenated. YA DUN GOOD !
Logged
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
rz5mark
1000 Class
Offline
Posts: 1849
Re: Ross’ 1975 CB750
«
Reply #351 on:
September 06, 2024, 05:19:42 PM »
VERY nice.
Logged
Galactica
1000 Class
Offline
Posts: 4637
Re: Ross’ 1975 CB750
«
Reply #352 on:
October 05, 2024, 01:56:46 PM »
So last spring I bought a used Dyna ignition off Facebook from a guy out in Agassiz.
Should have waited until my shoulder was a bit better to install it but I was so bored. Hadn’t intended to do until the winter. Anyway, I installed it last weekend only to discover it is NFG. The 1/4 pickup is open all of the time.
So I ordered a brand new Dyna off Amazon. Installed it today. Static timed it. Eazy Peazy. Will do a fine tune when next I start it, and that won’t be for some time. Will wait until my shoulder is well enough to go for a ride.
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
Online
Posts: 4644
Re: Ross’ 1975 CB750
«
Reply #353 on:
October 05, 2024, 07:54:31 PM »
Ya, used electrics, unless free.
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
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
hardrockminer
BCCMC Star (5K)
Offline
Posts: 5626
Re: Ross’ 1975 CB750
«
Reply #354 on:
October 06, 2024, 05:02:48 AM »
I have one brand new that I tried to give to 754 but we never managed to hook up before he died. I still have it in my shop somewhere. I was thinking of putting it on my KZ650 but I don't know if it would work.
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: 4637
Re: Ross’ 1975 CB750
«
Reply #355 on:
October 06, 2024, 07:33:50 AM »
If the plate fits, I think it should work. Give it a try.
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
Galactica
1000 Class
Offline
Posts: 4637
Re: Ross’ 1975 CB750
«
Reply #356 on:
October 30, 2024, 05:40:55 PM »
I thought I’d re-check the compression on the CB750 to see if it had changed any. Whe I bought the bike, it had sat for at least 10 years. I check compression with a borrowed gauge before I fired it up. 145,130,160,150. I thought, hmm not bad. But I wondered if it might change after running it for a while.
So I borrowed a gauge from John D. A different gauge. Put it on the #1 cylinder and cranked it over. What?!! Only 90psi! WTF? Then I realized I forgot wide open throttle. DOH!! Then 120,130,125,135. Not sure what to think so I did them again with the same results. Not sure what happened with my initial readings. I didn’t recheck them at the time. But I’m happy with the results I have now. As good as, or better than any of the Zs I had other than the ones with rebored motors.
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: 5626
Re: Ross’ 1975 CB750
«
Reply #357 on:
October 31, 2024, 04:40:34 AM »
Did you do the compression test cold? Eengine should be warmed up first. The Z1 manual says if you have 15 psi difference between any two cylinders you should investigate.
What is the specification for standard compression ratio? For a Z1 engine it's 8.5/1. That means 8.5 times 14.5 or about 125 psi.
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: 4637
Re: Ross’ 1975 CB750
«
Reply #358 on:
October 31, 2024, 07:40:39 AM »
I actually don’t remember if I did it cold the first time. This time it was cold as I have the tank and carbs drained until I can ride again.
Warm vs cold is a good point. But I’m ok with the latest values.
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: 5626
Re: Ross’ 1975 CB750
«
Reply #359 on:
October 31, 2024, 07:32:00 PM »
A little carbon in the compression chamber makes a big difference.
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
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