Question about RTO 50cc Moped Scooter

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I have a 50cc moped.. Im getting fuel and spark, however the spark is there but slightly faint.. spray gas in carb to get it to fire off but still wont start up .. Ive done a compression test and also adjusted the valves to specs but still wont fire off. Any help would be greatly appreciated, Thanx~

Posted by Anonymous on


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  • 250 Answers

Change the plug if spark still faint then check plug leads & coil.

Posted on Jan 17, 2018


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mike fuson

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SOURCE: fuel bowl on my 50cc scooter keeps empting and

It has nothing to do with the adjustments, what is going on is your float is stuck in the carb , you will have to take the float bowl off , float is sticking than you will have to try and clean the needle and seat valve.

Posted on Sep 07, 2009

Testimonial: "Thankyou The scooter is a jonway and it is new should I be having this type of problem. Do I need and expert to preform the sticking float correction?"



  • 12 Answers

SOURCE: 2007 50cc moped.wire with the fuse getting hot

Check the whole system over an see if evory thing is fastened securley,make shure that no two wires are toucing!

Posted on Oct 15, 2009


  • 1 Answer

SOURCE: hi have a yiying 50cc moped and it keeps cutting out and its slow

take it for a full service, clean it, check your brakes r not to tight, check all your oil levels, clean your ait filter ( all done in ur service), check your bettery isnt flat, all that kind of **** n hopefully it will be a smooth runner again

Posted on May 07, 2010


  • 2 Answers

SOURCE: moped

the gapping is standard you can u a match book and if it slides between the gap easy it is fine if it wont goo in the gap it needs to be gapped more if there is alot of space between it, it needs to be closed up some.

Posted on Jun 28, 2010


  • 5692 Answers

SOURCE: Massey Ferg 24 won't start. Spark to plugs, firing

Lots to check for small engine. First, have Starter draw checked for spinning Voltage draw. May be turning below what is needed to get engine going. Check compression specs. 60 sounds better than 30, most engines should not be more than 10% different in cylinder to cylinder compression. Spray small amount of 30W oil in each cylinder to determine if compression changes. Rings at fault if it does help, valves at fault if it does not.

Did it fire with ether? Should have run for a couple of seconds with ether. The valve timing is important and you need to adjust the valves to insure best compression. Even if you have Specs to adjust a warm engine, you need to be close on a cold engine. Don't remember if Fergusons had optional adjustable lifters like Fords.

Bad coil? They can be bench checked. Check also with hot wire to coil disconnected if your switch is letting power go to coil in RUN position.
Check your Cam timing and distributor as well as the capacitor inside the Distributor. Firing order?

Posted on Jan 02, 2012

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1. does fuel flow from the fuel hose to the carb?
2. do the floats in the carb allow gas to enter?
3. is the filter screen in the carb clean?
4. Is the main jet clean?
5. Is the pilot screw port clean?
6. See or

if all else fails turn off the choke

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Does it have gas? just kidding. Even experienced mechanics forget that one. It may not be getting gas into the engine though. I use an old trick, disconnect the air box boot from the carb, cup the carb inlet with my hand, which is called a hand choke, and turn the engine over while hand choking. Your hand should get wet with gas. Remove your hand after a couple of seconds or so, it may start, or try. If not hit, pull the plug and lay it on a good ground on the engine, do not touch while cranking over the engine to check for spark. These are two of the basic requirements of an engine.

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Don't do the gas down the spark plug thing. It's a bad idea. Do the following >
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 should be a screw on the lower side or bottom 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
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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 adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
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Please rate this solution. Thanks!

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