aforth Posted June 5, 2018 Share Posted June 5, 2018 I have a 2011 lambretta evolution with a lexmoto 125 4 stroke engineFather replaced air filter before it came down to me with a orange triangle looking thing No every now and then when I am caning it - it can splutter and stall - I wait 10 seconds - and it starts right back up again!Is this something to do with the carb/ air / fuel?Will a tinker with the fuel nut help at all? is it too tight or loose do we think?Someone said I need the jets altering to account for the new filter but want to sort it for short term before this gets doneThanks in advance Aaron Quote Link to comment Share on other sites More sharing options...
fastbob Posted June 5, 2018 Share Posted June 5, 2018 Welcome to the forum. Fuel nut ? Pictures would be helpful. Why not replace the orange triangle thing with a standard air filter ? Quote Link to comment Share on other sites More sharing options...
Wynne G Oldman Posted June 6, 2018 Share Posted June 6, 2018 First thing that I'd check is that the breather hole in the petrol cap, or breather pipe isn't blocked, creating a vacuum in the tank. Quote Link to comment Share on other sites More sharing options...
aforth Posted June 6, 2018 Author Share Posted June 6, 2018 I have been turning some crew on the carb that I have been told controls the air/fuel mix..?But I have now read somewhere that there is also a screw for the fuel idle?What am I looking for in the fuel tank bud? Should there be a hole in the actual fuel cap?ThanksA Quote Link to comment Share on other sites More sharing options...
Wynne G Oldman Posted June 6, 2018 Share Posted June 6, 2018 There will either be a small hole in the petrol cap, or a breather pipe that attaches to the petrol tank. The next time it happens, take the petrol cap off. If you can hear air whooshing in, the hole or pipe is blocked. Quote Link to comment Share on other sites More sharing options...
Lumor_uk Posted June 6, 2018 Share Posted June 6, 2018 Shouldn't have messed with the screw...screw it all the way back in then undo 1 and 1/4 of a turns (I'm guessing) to reset. I can't remember when, but old bikes used to have oil soaked air filters...is this one of them? I'm guessing the air filter is letting in too much or too little air for the bike to breath. Quote Link to comment Share on other sites More sharing options...
fastbob Posted June 6, 2018 Share Posted June 6, 2018 Shouldn't have messed with the screw...screw it all the way back in then undo 1 and 1/4 of a turns (I'm guessing) to reset. I can't remember when, but old bikes used to have oil soaked air filters...is this one of them? I'm guessing the air filter is letting in too much or too little air for the bike to breath. Until you post some photos its going to de hard to help you out. Attachments , add files , select from album , wait for them to load , submit . Quote Link to comment Share on other sites More sharing options...
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