SOHC.co.uk Forums > CB750
Hesitation after @ 4500 rpm
Laverda Dave:
Six months ago I bought 5 litres of super unleaded from my local BP in a nearly new jerry can. When I poured it into the empty fuel tank of the bike it wouldn't run. The fuel was off when I checked it, full of water and bits floating about. The petrol station was selling dodgy fuel, the jerry can was nearly new and absolutely clean as was the fuel tank, no rust or debris inside as it had been resprayed and rinsed prior to fitting the fuel taps.
I wrote to BP who said they would check the fuel at the independent petrol station even though it was fully branded as BP. I called the petrol station and they put the phone down on me. When I checked Google reviews others had suffered the same.
It's odd that your bike started playing up as soon as you put new fuel in, I would say that is the culprit.
Oggers:
Dave
I am beginning to think the same way. No idea why it should be so as I used super unleaded from the same spot beforehand and all was well. Mind that was some time ago. I'll drain the tank and fill afresh - from another petrol station!
McCabe-Thiele (Ted):
--- Quote from: Oggers on April 25, 2022, 10:24:34 AM ---Dave
I am beginning to think the same way. No idea why it should be so as I used super unleaded from the same spot beforehand and all was well. Mind that was some time ago. I'll drain the tank and fill afresh - from another petrol station!
--- End quote ---
I deleted my post about the fuel as I did not read the part where it will not rev above 4,500 rpm I read it as a hesitation then it would go on revving.
I agree too much of a coincidence that it goes wrong after fuelling - out of interest what brand fuel was it?
You might get away with draining the float chambers if you have such a capability unless dirt has got through to the carbs. I use an inline filter as well as the strainer on the tap.
Esso is probably the safest bet this link is a little old but explains the E5 paradox - in the South of the UK Shell & BP SUL is said to be Ethanol free but up North a different story due to the supplying refinery I guess.
https://www.windrushcarstorage.co.uk/blog/the-windrush-guide-to-e5-e10-and-ethanol-free-fuel.php
Oggers:
It's proving not to be an easy fix. That or I'm going dotty! Filled a clear empty brandy bottle with petrol to test presence of water in fuel - so much more sophisticated than a jam jar I feel! - Nothing settled out. Replaced all fuel with fresh from another petrol station - no joy. Removed the in line filter between petcock and carbs - no joy. Rode it with filler cap open - no joy - Fuel tap all clean...Proving to be very irritating! Any more clues would be greatly appreciated......
Oggers:
ordered condensors......I have a horrible feeling it isn't the fuel....
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