Topic: 1978 CB750K — Post 836 OIL PRESSURE

[willbird]

Thank you for the reply PeWe but all of that is way over my head...I want to just drive the bike somewhere and have them tune it....

Apparently this guy is good: https://cohenmotorsports.com/dyno-tune/ (he's the $600 guy)

But Southern California people, who do you recommend?

Mickey gets that ($$$$)as he is a very talented tech and mostly because the HD guys that go to him have bulging pride and deep pockets to bolster their pride.
Mickey used to handle all of the Triumph media fleet and was Triumph's go to guy to get answers to their problem bikes.(until he pissed off a new guy above him in corporate that didn't know him and what he knew.)
A great guy to be sure. Talk to him before you commit.

If he is buried in work at $600 he should give $700 a try probably :-)

[MRieck]

I spoke with my dyno guy (Rick Stetson) today. Full dyno tune EFI 600.00
 Carburetor bikes 500.00

[SKTP]

Thank you MRieck

[RAFster122s]

So far so good...

Good to hear and boy are those Cyber trucks ugly!

They make a Volvo 240 look good... Haha

[SOHC4 Cafe Racer Fan]

Mickey Cohen is the man as to Triumphs.

[SKTP]

Over 200 miles so far...

[Stev-o]

Looks great!

[SKTP]

Oil pressure.

So when I start my bike up (I have an oil pressure gauge just above the points cover) the bike get full pressure fairly quickly.

Then it randomly drops really low quickly a few times during warm-up.

Once the bike is warmed up, the pressure appears to act normally.

The actual Oil pressure light never comes on again once the bike is running.

Is this normal?

I am installing a CYCLE-X rebuilt oil pump because it is freaking me out.

[BenelliSEI]

That usually indicates the by pass valve is opening on the pump, and then closing again. How high does it go initially? What weight oil are you using?

[PeWe]

I have seen oil pressure warning blinking when idling a few minutes, bike on side stand.

Opened the oil cap and saw very low oil level, almost nothing. Pump filled a little that engine needed direct.

The angle of bike was not good for oil pump to fill tank with oil.

After that, no more warming up parked on side stand.

Happened both my CB750. 

[HondaMan]

I have seen oil pressure warning blinking when idling a few minutes, bike on side stand.

Opened the oil cap and saw very low oil level, almost nothing. Pump filled a little that engine needed direct.

The angle of bike was not good for oil pump to fill tank with oil.

After that, no more warming up parked on side stand.

Happened both my CB750. 

I've seen that happen when the seal between the 2 halves of the pump is getting hard and the engine is cold. After it warms up the oil returns faster to the tank from the sump: I'm imagining the seal gets more flexible with the heat, so the suction side of the pump gets more efficient(?). Replacing the seal(s) in the pump makes it stop doing that, which was how I pondered up this diagnosis. 

[SKTP]

Thanks guys...I will be replacing the pump very soon.