SOHC.co.uk Forums > CB750

Pressure gage tripping after 15min ride

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mgy66:
So Steff, you are suggesting replacing the oil switch rather than the oil...

I have moved up the mains to 110, raised the air screw to 1.5 turn, still running hot and thin oil...

Did not try yet the dw40 but noticed that there is a bit of gap at the junction of the needle holding screws and the support plate .. that may allow some needles to move up and down with instable idle. Will tight it up.

I was to try 15w40 oil instead of 10w30 before going to replace the pressure gauge but Steff, i am curious to see how you can measure the pressure... where do you insert the pressure gauge? Picture of the location of pressure gauge would help. For some reason i understand it is inside the engine in the pump...

Cheers

steff750:
its easier to change the oil switch first, unless you need to check the actual oil pressure,if you already have hold of a oil pressure gauge, you will need to remove the plug at the end of the oil gallery,that's where the oil switch fits but that's on top of it
the pressure gauge goes into the oil gallery just above the points cover take a look at some chopper photos a lot of custom bikes use a oil pressure gauge on their bikes

mgy66:
Steff, thanks for the input... i think i know where is this switch. It must be the black connection in the middle of the gallerie right above the starter cover. I have checked on youtube and it seems to be a classic issue.
www.youtube.com/watch?v=MhQeIY_gTOg

I dont know why the repair shop did not suggest it when he checked the pump and changed the oil... or i hope it is the switch and it is easy to source on ebay or DSS.

Cheers

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