SOHC.co.uk Forums > CB750
Esso petrol contaminated with water or stale petrol
Matt_Harrington:
--- Quote from: AshimotoK0 on October 08, 2023, 09:24:05 AM ---Evidently 'Esso Synergy Supreme+ 99' is ethanol free and they sell it at the Tesco garage closest to me.
Don't shoot me if I am wrong ... just read about it on another forum.
--- End quote ---
Ash, I believe the Supreme fuel isn't available in Devon / Cornwall. I use this fuel whenever possible and confirm there is no ethanol in it (AFAIK)
hondacb750fourk6:
--- Quote from: AshimotoK0 on October 08, 2023, 09:24:05 AM ---Evidently 'Esso Synergy Supreme+ 99' is ethanol free and they sell it at the Tesco garage closest to me.
Don't shoot me if I am wrong ... just read about it on another forum.
--- End quote ---
It’s a Rover 2.2 twin carbs with su carbs on it
K2-K6:
Presumably a P6 then ? A nice car and very interesting design too.
SU will ordinarily not be unusually sensitive to anything much in the way of minor fuel compromise. Unsure if you are experienced with them or new to you ? Check the oil in carb dash pots if you've not already looked there.
Sounds more likely ignition if it's on points still.
Bryanj:
Also check the rubber pipe between carbs i have seen one where slivers of rubber came off the inside when fitting and messed up float needles
Martin6:
Any non metal fuel pipe, if not replaced with ethanol proof, will degrade. In some cases it dissolves and coats the carbs.
I have twin SUs on an old Triumph car. The carbs are fine with E10, but the fuel will go 'stale' after a few months. Very difficult to start and runs badly until new fuel gets through.
I always turn off the fuel tap on carburettor motorbikes and run the final half mile or so, to run them as dry as I can. I now know where to turn the taps on each bike, so I run out just as I'm home. At least it empties the jets and pilot circuit. Don't know if that works, but no problems so far after a number of years, having made sure they were clean to start with.
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