Question about 2000 Yamaha XV 125 - S

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Yamaha Neos 50cc water in carb

Hi I have a Yamaha Neos 50cc scooter. I'm having a problem with it where the engine keeps losing power when I open the throttle. It then cuts out and won't start for a few minutes. I've taken it into a garage for a service and they said the carb was full of water. He cleaned it all and it worked fine for the first few miles but then started again. When I took it back he said there was more water in the carb. He thinks its being sucked in through the air filter. Will changing the filter fix this? I don't want to just keep throwing money at it if its knackered. Any advice would be greatly appreciated!

Posted by Anonymous on

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It might be sucking in water from the air filter or worse there is a cracked head some place in the intake of your bike

Posted on Apr 16, 2017

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6ya6ya
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Posted on Jan 02, 2017

herbmeister
  • 7 Answers

SOURCE: Engine cutting out when open throttle. YAMAHA NEOS 50cc MOPED

i had a simuler problem with my honda cr 250 moto-x bike it would start fine and you could keep it ticking over with the throttle(i have deliberatly unscrewed the tickover in case i come off,it will cut out) when i got on it,it would go for about 400-500 metres then splutter and die and not start again for around 5 mins. i immediatly knew it was a fueling problem. so after stripping the carb and giving it a good clean out i was baffled when i got back on and it still done the same. i then dismantled the fuel tap cleaned it all out and put it back together and tested it,it was very very slow so i unsrewed my fuel cap a little and was greated with the familur gush it should deliver. problem solved! the vent in my fuel cap had crystalised up,so the fuel was coming out but the air was not getting in,causing a vacuum and slowing down the flow and basically emptying the carb quicker than it can fill back up!!! clean your carb,fuel tap and any vents in your cap or tank. if this does not work then your bike must be over fueling or low on compression.

Posted on Sep 18, 2009

  • 26 Answers

SOURCE: hi ,i have yamaha fz6

Try cleaning the side stand switch, the chain lube covers it and they stick on and off

Posted on Dec 08, 2010

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Yamaha Neos 50cc water in carb


water from an air filter will not get into the carby bowl to block the jets
water in a carby comes from the fuel tank
if you are using e-mix fuel change to straight petrol as the ethanol in the fuel attracts water out of the atmosphere or the pump where you get the fuel has a water problem in the storage tank
next add methylated spirits ( around 20mm to a gallon) to the fuel tank to break down any water so that t it can go through the carby and be burnt in the combustion process best fix is to remove the tank and have it properly cleaned out, clean the fuel filter , have the carby properly overhauled and get the fuel from a different servo

Apr 07, 2017 | 2010 Yamaha Neos

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