SOHC.co.uk Forums > CB750

Probably last ride this year

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RGP750:
Great ride today around Kent and E Sussex, just short of 500 miles since re build.
With fuel above reserve every thing is great BUT, and i have spoken about this before,
as soon as the fuel reaches reserve she cuts out on the two cylinders fed by the front fuel pipe
from the tap.
the rear pipe feeds straight down and the front pipe does a right angle bend within the tap,
so least resistance /easiest flow is straight down so that's the way the fuel seems to want to go,i'm totally
puzzled by this and can see no answer except pass on £50 to DS for a new tap.
any ideas guys?
Rich

mick:
Do both pipes coming out of the tap vertical ? cheers Mick  ;)

steff750:
 ;) why you parking  the bike up ???
 its going to be a Indian summer you know
carry on regardless , I don't see that you have  any real problem with your tap as far as I can tell I think all my CB750's do that and I got five. although  some are better than others at least one of mine will run on two cylinders for ages until the reserve fuel fills up the float bowls and then they all chime in again , but like you say yes it could be the tap being blocked,I try not to leave the fuel get that low, as once you switch to reserve you are getting all the crap that's in the bottom of the tank come with it and that will only add to the problem ,I can do about 115 miles then its on to reserve, let us know if a new tap cures it, but I can live with it I need £50 more than Dave silvers  ;)
 BTW my fuel pipes run straight down and up under the t junctions I don't think they make any difference to fuel flow and I've only done this to make it easier to remove the fuel lines from the tank

RGP750:
Cheers Guys
I'm busy the next 3 weekends, and expect weather to be rotten by then,if it's not i'll get
in another ride.
Pipes are vertical, no blockages and if i put my finger over the rear pipe the fuel flows freely from the
front pipe. Even stopping to give the fuel time to fill up the bowls it dosen't happen, God knows why
i'm baffled by it.
Fill the tank all is ok.
 :-[

Lobo:
Rich,

Presumably you've checked the #7 bit "Fuel Valve packing" is actually the right part / spec... ie is not homemade or off a similar, but different (eg single feed) petcock?

Have you had it all to bits in your hand & 'traced' the fuel run with the the cock in the 3 positions?

Cheers,
Simon

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