Author Topic: CB750 Oil flow?  (Read 468 times)

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Offline jebon

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CB750 Oil flow?
« on: September 20, 2020, 05:30:06 am »
I got my newly acquired K0 started up but I'm worried about oil flow. Pressure light goes out when starting. I found out when I got it home that it had no oil in the sump. I put oil in it but looking down the tank the oil sits still when running. Am I in trouble? How can I check?
"Don't let schooling interfere with your education"
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CB750 K0 1971

Offline newday777

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Re: CB750 Oil flow?
« Reply #1 on: September 20, 2020, 05:46:48 am »
How did you figure out there wasn't oil in the sump? Was it shipped without oil in the bike?(over seas shipping companies usually require no oil or gas in bikes). Maybe if you had it shipped to you and prepped that they didn't start the bike but only put oil in the oil tank??
Your oil light goes out is a good indicator you have oil pressure. Remove a valve adjuster cap to see if you have oil flow to the top end.
1975 K5 Planet Blue summer ride
1976 K6 Anteres Red rebuilding project
2008 GL1800 daily ride and cross country runner

Offline jebon

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Re: CB750 Oil flow?
« Reply #2 on: September 20, 2020, 05:54:24 am »
How did you figure out there wasn't oil in the sump? Was it shipped without oil in the bike?(over seas shipping companies usually require no oil or gas in bikes). Maybe if you had it shipped to you and prepped that they didn't start the bike but only put oil in the oil tank??
Your oil light goes out is a good indicator you have oil pressure. Remove a valve adjuster cap to see if you have oil flow to the top end.
I bought the bike locally. When I wanted to change the oil, nothing came out. So fire up the bike with a valve cap off?
"Don't let schooling interfere with your education"
---
CB750 K0 1971

Offline newday777

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Re: CB750 Oil flow?
« Reply #3 on: September 20, 2020, 06:21:02 am »
How did you figure out there wasn't oil in the sump? Was it shipped without oil in the bike?(over seas shipping companies usually require no oil or gas in bikes). Maybe if you had it shipped to you and prepped that they didn't start the bike but only put oil in the oil tank??
Your oil light goes out is a good indicator you have oil pressure. Remove a valve adjuster cap to see if you have oil flow to the top end.
I bought the bike locally. When I wanted to change the oil, nothing came out. So fire up the bike with a valve cap off?
First, kill switch off, spark plugs out and spin over with the starter to observe oil flow to the top end.
1975 K5 Planet Blue summer ride
1976 K6 Anteres Red rebuilding project
2008 GL1800 daily ride and cross country runner

Offline jebon

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Re: CB750 Oil flow?
« Reply #4 on: September 20, 2020, 06:27:18 am »
How did you figure out there wasn't oil in the sump? Was it shipped without oil in the bike?(over seas shipping companies usually require no oil or gas in bikes). Maybe if you had it shipped to you and prepped that they didn't start the bike but only put oil in the oil tank??
Your oil light goes out is a good indicator you have oil pressure. Remove a valve adjuster cap to see if you have oil flow to the top end.
I bought the bike locally. When I wanted to change the oil, nothing came out. So fire up the bike with a valve cap off?
First, kill switch off, spark plugs out and spin over with the starter to observe oil flow to the top end.
I see oil flowing. Thanks
"Don't let schooling interfere with your education"
---
CB750 K0 1971

Offline ekpent

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Re: CB750 Oil flow?
« Reply #5 on: September 20, 2020, 06:31:25 am »
 You should see oil circulation in the oil tank running plus bubbles etc.

Offline newday777

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Re: CB750 Oil flow?
« Reply #6 on: September 20, 2020, 06:34:56 am »
Good to hear you have flow. Yes you should see some bubbles and movement in the tank when running.
1975 K5 Planet Blue summer ride
1976 K6 Anteres Red rebuilding project
2008 GL1800 daily ride and cross country runner

Offline jebon

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Re: CB750 Oil flow?
« Reply #7 on: September 20, 2020, 07:33:04 am »
Good to hear you have flow. Yes you should see some bubbles and movement in the tank when running.
Just took it for a very short ride (1 min)
When I got back I had white smoke from 1 and 4
"Don't let schooling interfere with your education"
---
CB750 K0 1971

Offline PeWe

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Re: CB750 Oil flow?
« Reply #8 on: September 20, 2020, 11:25:24 am »
When draining oil without oil filter and cover.

Do not spin starter too long until oil stop coming.

It takes long time to get pressure when oil is refilled, new filter w cover on.

Plugs off unloads the crank a little and let it spin easier.

Offline BenelliSEI

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Re: CB750 Oil flow?
« Reply #9 on: September 20, 2020, 12:48:01 pm »
White smoke can be condensation or moisture burn off. Have you changed out the old gas? Drain the tank and put fresh fuel in. Get it hot and change the oil and filter.......

Offline bryanj

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Re: CB750 Oil flow?
« Reply #10 on: September 20, 2020, 01:45:31 pm »
Need to get it evenly hot, i would say at least 20 mins riding(not in traffic) before seeing what smoke you get
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline newday777

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Re: CB750 Oil flow?
« Reply #11 on: January 22, 2021, 10:27:21 am »
Good to hear you have flow. Yes you should see some bubbles and movement in the tank when running.
Just took it for a very short ride (1 min)
When I got back I had white smoke from 1 and 4

Any further results to update?
1975 K5 Planet Blue summer ride
1976 K6 Anteres Red rebuilding project
2008 GL1800 daily ride and cross country runner

Offline ekpent

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Re: CB750 Oil flow?
« Reply #12 on: January 22, 2021, 04:20:30 pm »
Good to hear you have flow. Yes you should see some bubbles and movement in the tank when running.
Just took it for a very short ride (1 min)
When I got back I had white smoke from 1 and 4

Any further results to update?
Looks like the engine is apart for a rebuild and paint. Current thread going on now. http://forums.sohc4.net/index.php/topic,185069.0.html

Offline jebon

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Re: CB750 Oil flow?
« Reply #13 on: January 24, 2021, 02:52:21 pm »
Good to hear you have flow. Yes you should see some bubbles and movement in the tank when running.
Just took it for a very short ride (1 min)
When I got back I had white smoke from 1 and 4

Any further results to update?
Looks like the engine is apart for a rebuild and paint. Current thread going on now. http://forums.sohc4.net/index.php/topic,185069.0.html
Thank you. Sorry for the multiple threads
"Don't let schooling interfere with your education"
---
CB750 K0 1971