Yamaha aerox 50cc how to get to the spark plug

SOURCE: loss of revs

Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There may be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

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SOURCE: i have a 2005 yamaha iog 50cc scooter it has a

Hi and welcome to FixYa,

Initially, a couple of checks:

• is there sufficient compression - compression test;
• is there suction - cover the carb in port with the palm of your hand, when starting, it should be wet with fuel;
• determine if fuel is reaching the sparkplug / combustion chamber;
• condition of the intake reeds;
• excess 2T oil in the crankcase - clean, air dry.
  

SOURCE: i have yamaha aerox and wont start

Have you been using 2 stroke oil in the oil tank? A lot of new riders haven't had this explained. A neighbour used engine oil and has now got to strip and refurbish the engine. A 2 stroke engine mixes oil with the petrol to lubricate the crank and con rod on the induction cycle. If you use engine oil, it carbonises in the engine due to the extremely high temperatures on the underside of the piston and aroud the bearing surfaces of the crank. It will run "ok" for a short while on this oil, but will eventually kill your engine. Also on 2 strokes the exhaust system needs regular cleaning to remove "coke" which is burnt oil in the form of a sludge. 2 strokes use exhaust tuning to improve performance and efficiency, so it may need a clean. This is the best advise I can offer with the information supplied, and also the most obvious. Just one other thing - when you turn the engine over do you get a spark? It could be the coil, if the rest is good. Sorry I can't be of more assistance, I hope this give you an idea of where to go from here.

SOURCE: no fuel getting through to engine yamaha aerox

You are going to want to know if yours is fuel injected or carborated. I am pretty fairly certain it has a carb. So you are going to want to go to your gastank and follow the hose to your carborator. There is probably a spring clamp on the hose so take that off shut off your fuel valve. Now take the hose off and put the hose over something you can put gas in and turn on the fuel shut off valve. If gas comes out freely then its your carb if it doesnt its your shut off valve and quite probably you carb. You will then just need to clean them thoughlly and check them again after you get them back together . if it is the shut off valve check it again first before you rip the carb apart. if its fuel injected which i dont think it is email and i will walk you through that.
A.J. Weaver