SOHC.co.uk Forums > CB750

Pressure gage tripping after 15min ride

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Johnwebley:
as far as oil temp is concerned,I looked on the WWW for air cooled engines,

and seems they can run at upto 260F/or about 130C,

 did you check the head?

or sump?

 or oil tank?

mgy66:
I will test after between carbs and engine but there is only the black silicon tubes so if air leakage it can only come from loose rings around the silicon tube.

Temp is measured at tank side 200F.

I think i read in haynes book that the gauge can trip at idle but here we are talking from 1000rpm to 4500rpm...

I am going to test few options before changing the oil... get the idle steady with search of air entry, move to 110 main jet and increase the air screw to balance air mixture at idle and pick up, then change the oil spec and if it still tripping change the sensor, hopefully get one spare from DSilver...

Thanks to you all...

Bryanj:
Sorry got to ask just what you mean by gauge "Tripping"

royhall:
Think he means the oil pressure warning light coming on Bryan. Been watching this thread with interest.

Sent from my Nexus 7 using Tapatalk

steff750:
 ;) lol lets try and kick this one in the long grass
about two weeks ago i came back from a half hour blast at 70-80 mph up the m4 we had been to a bike show and crap weather so was not hanging around, be that the bike(cb750k0) was a rough rebuild and the oil light would flash on at tick over
by the time we stopped i showed my mate that the oil light was staying on up to 2000 rpm ,he said the mains must be knackered, i said yes probably but it still goes well and no nasty sounds, i will change the oil switch when i get home
and yes the switch was giving a very low reading,and the oil was very hot and thin ,after checking with a pressure gauge (40 psi)and a new oil switch it still goes well,ofcourse there is wear there its 45 years old, but the oil light dont come on anymore  ;)

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