SOHC.co.uk Forums > CB750
‘750 Start gremlin.
Lobo:
Thanks all - will try different plugs…
Skoti:
Similar happened to me after a 4 week layoff.
Turned out to be water in the carb float bowls.
Put it down to E10 petrol.
Always use super plus E5 now.
Lobo:
Thanks Skoti - appreciated. Tbh though, I’m in the habit of selecting the fuel OFF a mile out from home, and running the ‘bowls dry < putting the K2 to bed. This, I guess, would negate water in the carbs? (also stay away from Ethanol additive fuel)
Martin - apologies, didn’t reply. The bike has all new loom, as new electrical components, clean connectors / earthings etc, and a new LiFe battery - whose characteristics include minimal voltage drop over time (a year at least). And given the very energetic cranking witnessed, I’m confident the battery voltage is just fine.
A suggestion has been made to open the ‘plug gaps up slightly (have electronic ignition) in an effort to provide a ‘better’ spark which might hopefully offset the rich start mixture / cold engine otherwise extinguishing it. Makes sense, and certainly worth a shot; it’ll take a few weeks to verify and I’ll obviously report back.
Cheers…
McCabe-Thiele (Ted):
This E10 fuel that has been forced upon us is very Hygroscopic so virtually impossible for it to not absorb water even from the air inside/above the fuel tank.
Thank goodness for SUL that varies between E0 & E5 max at the moment & Wynns Dry fuel.
For the first time in 20 years our Merc that is only used in the summer months developed a misfire this May on its first outing - when it went for Mot dealer confirmed it was old fuel - we used to brim the tank for winter now I am running it down so the reserve fuel light is on as well as adding Octane booster in the spring.
taysidedragon:
I agree with Ted. If water is absorbed in the fuel in the tank it will tend to lie at the bottom because it is heavier than petrol. As soon as you open the fuel tap the carb bowls fill with any water laying at the bottom, giving a watery, petrol mix. Not good for starting or running.
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