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BRITISH COLUMBIA CLASSIC MOTORCYCLE CLUB
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Author Topic: Ross’s CB750 project  (Read 12333 times)
Galactica
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« Reply #30 on: February 07, 2023, 09:44:28 AM »

You can check for air leaks by spraying a bit of carb cleaner on them while the engine is running and listening for a change in revs.

I had tried, using propane from an unlit torch and bottle.
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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: 4644



« Reply #31 on: February 07, 2023, 12:05:11 PM »

So, I’ve borrowed a compression tester from Rick at Bby Kawasaki.  Wish me luck.  I’ll let you know the results.
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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: 4644



« Reply #32 on: February 07, 2023, 02:58:10 PM »

Ok. So I did a compression test.  150-148-130-148.  Not great, but not disastrous.  The KZ900 I had was worse and I rode that bike a lot, and it worked just fine.
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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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15/16ths of the world uses the metric system.


« Reply #33 on: February 07, 2023, 03:50:50 PM »

I wouldn't worry until you've put some miles and heat cycles on the engine.
It's probably just gummed up rings from sitting.
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It's important to feel comfortable in your own skin because it's illegal to wear someone else's.
Steve G.
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« Reply #34 on: February 07, 2023, 09:05:40 PM »



  Italian tune-up is what she needs!
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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
hardrockminer
BCCMC Star (5K)
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« Reply #35 on: February 08, 2023, 05:17:12 AM »

Now you know that running issues are either fuel or ignition.  Or perhaps both.
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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
Galactica
1000 Class
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Posts: 4644



« Reply #36 on: February 14, 2023, 08:01:37 PM »

Ok.  So, a bit of progress.

I put on an aftermarket seat cover.  Looks ok.  Got the front brake sorta sorted ( more about that in a moment).  Got it running well enough to run it up the lane and see if it shifts. 

Ran it up the lane.  It shifts ok.  Front brake locks up the wheel quite easily (maybe old hard tire?). 

Side covers are really brittle.  They break every time I try to put them on or take them off.  Oh well. 

Now that I know it will go and stop (sorta) I think I’ll start dismantling, cleaning and de-rusting.  Maybe put a permit on it the end of April, take it out to the swap meet and try to get some of my money back.  If not I’ll keep it, sink in a bunch of money and ride for a while.

I dunno, any plan only survives until the first punch in the face (Mike Tyson).
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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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Posts: 4676



« Reply #37 on: February 14, 2023, 10:49:50 PM »



  I'm sensing unenthusiastic victory?Huh?
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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
1000 Class
******
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Posts: 4644



« Reply #38 on: February 23, 2023, 06:11:29 PM »

So, I’ve done as much to this bike as I’m willing to do until I actually see how it runs and rides.  I’ll wait until there’s a good weather window to pull a three day permit for some sea trials.  Couple small items still though.  Have to install the grips and check the petcock and that’s it for now.
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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
hardrockminer
BCCMC Star (5K)
*******
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Posts: 5646


« Reply #39 on: February 24, 2023, 05:29:14 AM »

You're a good man Charlie Brown! Grin
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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
Runningdog
1000 Class
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Posts: 4931


In Dog Beers I've only had one.


« Reply #40 on: February 24, 2023, 04:29:24 PM »

Ross, that's good progress......it's a relief to be able to look at getting beyond confirming that you have a runner.   Victory!!!!!
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Past:  '82 Suzuki GS400E; '82 Suzuki GS750E; '81 Yamaha Virago 750; '82 Suzuki GS650GL; '77 Yamaha DT250; '80 GS 850; '86 Kawasaki ZG1000; '78 XS400; 1971 Motobecane Mobylette; 1980 Yamaha SR250; various parts/project bikes, 2004 ZRX 1200; 1977 CB750K; '73 Triumph TR5T (Vintage Plate) .
Present: ; '75 Honda XL250 (Collector Plate);  '04 Wee-Strom;  1973 Honda CB350 6-million Dollar Project;   1979 GS750E
Galactica
1000 Class
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Posts: 4644



« Reply #41 on: March 01, 2023, 04:57:18 PM »

I replaced one of the dashboard bulbs, and….MEEP MEEP!!  Now I have a horn that works!  Thanks very much Bucko.  So now everything on the bike is functioning.  Hopefully we’ll get a decent weather window soon.  I’ll get a permit and put the bike through a few heat cycles. 
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 Offline

Posts: 4644



« Reply #42 on: March 11, 2023, 04:01:56 PM »

I think (hope) I have the accelerator pump mostly sorted.  At least it’s better than it was.  Hopefully I won’t have to pull the carbs again.  Just waiting now for a weather window so I can run a couple of tanks of fuel through it.  Ripped it up and down the lane a few times, only managed to get into 2nd gear.  We have speed humps in the lane so you can’t get much speed.  Plus, with the header that’s on it, it’s frickin’ loud.  I don’t want to piss off the neighbours too much.  Runs really good though.  I like it.  I may just keep it.  Just waiting now for a weather window so I can run a couple of tanks of fuel through it.
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 Offline

Posts: 4676



« Reply #43 on: March 11, 2023, 09:29:13 PM »



  Geez Ross. It would be a perfect machine for a run to Tuktoyuktuk! That engine will run until the next ice age! A set of knobbies, high fender, I can see a new sub category being birthed. Screw the cafe racer dudes!!!
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
Galactica
1000 Class
******
Offline Offline

Posts: 4644



« Reply #44 on: March 11, 2023, 11:09:56 PM »



  Geez Ross. It would be a perfect machine for a run to Tuktoyuktuk! That engine will run until the next ice age! A set of knobbies, high fender, I can see a new sub category being birthed. Screw the cafe racer dudes!!!

Hey, that’s the trip you’ve been planning.  I’ll sell you my CB and live vicariously.
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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