Velocita Rosso Posted March 2, 2020 Share Posted March 2, 2020 Well, after our trip to the continent I don`t know what we picked up in the fuel over there. Fuel starvation on high revs gives a rough running ,just as though it was running on three pots. I changed the jets and choke return springs and reassembled....still getting the same symptoms,decided to strip the whole system. In the front bowl there was a watery,sugary, grainy type gunge and some in the needle valve. So now need to strip the rear and also in line filter.The question being, has anyone come across this type of sediment before....in all my years I have never seen anything like it, Don`t know whether it was dodgy fuel, or additive in the fuel .......or whether someone has dropped some sugar in the Spit,non lockable tank cap Quote Link to comment Share on other sites More sharing options...
Pete Arnold Posted March 2, 2020 Share Posted March 2, 2020 Quoted from Velocita Rosso- Don`t know whether it was dodgy fuel, or additive in the fuel .......or whether someone has dropped some sugar in the Spit,non lockable tank cap Mike, Just a thought - did you have to use E10 fuel whilst abroad? If so it might have caused your fuel lines to start decomposing. Cheers, Pete Quote Link to comment Share on other sites More sharing options...
Velocita Rosso Posted March 2, 2020 Author Share Posted March 2, 2020 Quoted from Pete Arnold- Quoted from Velocita Rosso- Don`t know whether it was dodgy fuel, or additive in the fuel .......or whether someone has dropped some sugar in the Spit,non lockable tank cap Mike, Just a thought - did you have to use E10 fuel whilst abroad? If so it might have caused your fuel lines to start decomposing. Cheers, Pete No, modern fuel hose, and they are all intact.....in the back pot there was an oily film, looked like an olive oil pool on water. weird Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted March 2, 2020 Share Posted March 2, 2020 The "sugary" stuff sounds like aluminium corrosion from the float bowl itself, most likely due to water in fuel. E5 and E10 are more prone to water absorption as the ethanol provides a linking effect between the water and hydrocarbons so the water doesn't just settle in the tanks. Didn't suffer it on the last trip but have had problems before, usually after buying petrol at small rural French fillings stations that mainly sell diesel. One just before our ascent of the Col du Bonett particularly sticks in mind as it made the engine knock as though we'd killed a couple of big ends whilst climbing the pass, which was quite alarming. A dose of the good stuff (Optimax) cured it. Nick Quote Link to comment Share on other sites More sharing options...
Velocita Rosso Posted March 3, 2020 Author Share Posted March 3, 2020 Thanks Nick , that sounds the most plausible. I think now I have done a complete cleanse and hit the reset button....it just needs a blast to get going again.....The Lowlands methinks! Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted March 3, 2020 Share Posted March 3, 2020 Mike, I always use 98 E5, but i drive everyday so no real problems. My uncle did a test with 95 E10 in a bottle and leaving it 2 to 3 weeks. Water was at the top and green stuff ... so not good at all :( . My uncle is very busy with chainsaw's etc, all the carbs need cleaning regularly and membranes go bad fast :( . Quote Link to comment Share on other sites More sharing options...
Velocita Rosso Posted March 3, 2020 Author Share Posted March 3, 2020 Quoted from WIMPUS- Mike, I always use 98 E5, but i drive everyday so no real problems. My uncle did a test with 95 E10 in a bottle and leaving it 2 to 3 weeks. Water was at the top and green stuff ... so not good at all :( . My uncle is very busy with chainsaw's etc, all the carbs need cleaning regularly and membranes go bad fast :( . Bit drastic! ......cleaning carbs with a chainsaw! Quote Link to comment Share on other sites More sharing options...
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