Question about AJP PR4 125 Enduro Motorcycles

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My son has a yiben motro scooter model yb50qt-3 year 07 it starts then stalls i have checked the carb and its clean and also blown the fuel pipes but still happens can you help chris make and model not on here

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  • AJP Master
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Hi, Chrisandl773 the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or a damaged battery, 9 volts or lower.
2. Faulty alternator/generator and or voltage regulator.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Faulty main circuit breaker or ignition switch, check for loose connections and continuity.
5. Faulty system and or ignition relay, check for continuity.
6. Faulty ignition coil, ignition/electronic module.
7. Faulty CKP, CPS, CMP, MAP, TPS, O2, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Water or dirt in the fuel system, carburetor or filter.
9. . Restricted, blocked or kinked fuel line.
10. Fuel tank empty.
11. The gas cap is not venting properly or fuel tank venting system blocked.
12. A faulty Fuel Pump, pressure regulator and or fuel injectors.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
For more information about your issue, please visit the websites below. Good luck and have nice a day.
Yiben Scout 50 YB50QT 3 Yiben Scooters 50cc Scooters Learner Legal...

Posted on Oct 29, 2015

6 Suggested Answers

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Posted on Jan 02, 2017

Benimur
  • 6966 Answers

SOURCE: my hyosung will not idle then once switched off will not start

Hi and welcome to FixYa,

Initially and based on your description, this pertains to a fuel issue. Corrective action would involve not only changing the fuel but cleaning the fuel tank, the built-in fuel filter, the fuel valve, the carb. Particular attention should be given to the jets and the multiple pin holes.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 29, 2008

  • 74 Answers

SOURCE: 1995 honda cbr f3 wont start

I would think about investing in a carb re-build kit.

Posted on Dec 22, 2008

  • 126 Answers

SOURCE: klx 110 2006 stalls when choke is pushed in

i'd say the carb is gummed up especially the pilot jet (#16158) in this pic of the USA carb. may have to remove the carb & bowl and then remove the pilot jet (w/ flat head screw driver) and clean out the tiny holes.

http://partsfinder.onlinemicrofiche.com/atlanticcycleandpower/Kawasaki_OEM/KawasakiDB.asp?Type=18&A=39&B=17&Action=O

-OR-

the carb slide is installed backwards (turned 180 degrees). its #16025 in the pic. i've done this before on my daughter's XR70 and Z50. you'll know if its this when you move the choke lever, RPMs increase and decrease.

hope this worked for you and was fast enough.

Posted on Feb 06, 2009

  • 3567 Answers

SOURCE: honda pal 2 stroke scooter

Are you adding oil to the gas? (32/1 = 4 ounces per gallon)
Do you still have spark? Install a new stock spark plug.
Clean the carb, but follow these steps >

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 two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
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. Let the bike warm up then set the idle speed. This process should get you back on the road.

Posted on Mar 31, 2009

  • 66 Answers

SOURCE: fuel pipes te610 husqvarna

the tank thumbscrew on the left side is you reserve. it needs to connect to the petcock on the right side, across the carb to the top pipe. the petcock should have arrows on it (backside). the bottom petcock pipe goes to the carb. the carbs inlet pipe is on the right side and is adjustable...single screw in the center of inlet pipe allowing it to be rotated for straighter hose connection. that is depending on year of coarse.

Posted on Oct 03, 2009

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2 Answers

Scooter has 40 original miles.New,old gas, I put innew gas. It starts,idles only, if I give it gas it stalls and won't run..


Hi, Rick if your bike has been idle for months or years and does not want to start you will have to deal with a few remedies:
1. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
2. Remove your air cleaner and clean and re-oil per Mfg. specifications.
3. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
4. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
5. Replace spark plug with a new one and check for spark.
For more information about your question please visit the website below. Good luck and have a nice day.
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Yiben Meiduc


your carb mixing screw may be to ritch so anny air resticition ist going to notmix fuel and air right lean it out

Sep 24, 2013 | RTO 50cc Moped Scooter

1 Answer

50cc scooter repair


Hi, Anonymous if your bike has been idle for months or years and does not want to start you will have to deal with a few remedies:
1. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
2. Remove your air cleaner and clean and re-oil per Mfg. specifications.
3. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
4. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
5. Replace spark plug with a new one and check for spark.
For more information about your question please visit the website below. Good luck and have a nice day.
Toyota 3A Engine start up after sitting for 10 years prep work Vespa Scooter starts after 10 years of sitting

Sep 11, 2013 | Beta Motorcycles

1 Answer

Scooter starts but turns off


Hi, Domagoj and the usual suspects are:
1. Idle speed improperly adjusted.
2. Inlet system air leak.
3. Leaking accelerator pump.
4. Loose low-speed jet.
5. Plugged low-speed jet.
6. Contaminated or plugged low-speed circuit.
7. Enrichner valve is not seated or leaking.
For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have nice a day.
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http://absolutelyscooters.net/service-manuals.html
CPI Scooter Parts Racing Planet USA

Apr 26, 2012 | Cpi GTR 50 Motorcycles

1 Answer

Scooter won't start with electric start or kick start.


  1. Try depressing the brake handle when starting.
  2. The battery has not been charged.
  3. The battery is hooked up wrong. This is often the reason for blown fuses.
  4. There isn't enough gas or two-stroke oil in the scooter.
  5. There is a gas flow problem, especially on the Euro Scooter or Yamaha models.
  6. The spark plug wire is not connected.
  7. A low battery or bad relay can cause the scooter to only start by using the kick starter.
  8. There is no spark to the spark plug. The coil is bad and needs to be replaced.
  9. Turn the key to the "on" position.
You need to check for a spark. There are a few ways to do this. The easiest way is to remove the spark plug and put it back in the spark plug cap. Then ground it to the engine - you should be able to lay it against a non-painted portion of the engine. Make sure there is good metal-to-metal contact. In a semi darkened area, attempt to start the scooter. You should see a definite spark at the tip of the spark plug. It's hard to see in direct light. If the color of the spark is blue, that means it's a strong spark. A white color is less strong, and a yellow color is weak. Most scooter starting systems are a bit weak (compared to cars). Even a yellow spark should start your scooter just fine.
The spark must occur at the right time. Just about all scooters made since around 1980 have an electronic ignition. These systems can rarely be set. In general, the spark occurs just before the piston reaches the top of it's stroke. There is a slight delay between the spark plug fire and the fuel-air mixture ignition. That's why the spark occurs a little early. Most ignition systems have an advance unit build in. As the engine speeds up, the time of the spark retards a little bit. This helps the engine fire the mixture at the proper time

There are a lot of tiny fuel and air passageways in the carburetor that must be kept clean it order for your scooter to run right. Carefully, take the carburetor apart. This can be relative easy (on a 50cc scooter). The carb has tiny passages that can get gummed up. Your scooter will not run correctly if the carburetor isn't completely clean, so take your time. I use a gallon container of carb dip (you can get a gallon at your local auto supply store).
First, remove all of the rubber and gaskets or they will get damaged. After a 20 minute soaking in carb dip, I blow out the carb with compressed air. You have to get all the jets and the passageways clean. Be sure the jets are clear, especially the starter jet. Sometimes carb cleaner won't clear out these tiny jets. Use a guitar or a piano string, a strand of copper electrical wire, or a tiny drill bit pin vise. Be sure not to increase the size of the hole in the starter jet or you'll change the tuning. Carefully reassemble everything, checking for cracks in the rubber carb boots and the gaskets. Replace them if they are old and cracked. Be sure and remove all rubber and gasket material first or they could get ruined. Spray carb cleaner also works if you're diligent.
If you have an electric choke, check it to make sure it works. Check the resistance between the wires - you should see around 10 ohms or less. Measure the length of the choke assembly. Remove the choke from the carb and plug the wires into a 12V source for 15 minutes. The choke body should be warm. Measure the length again - it should increase by around 1/8".
Next, consider whether your exhaust pipe is clogged. This is especially a problem with older two stroke scooters. The unburned fuel/oil mixture builds up in the exhaust pipe along with carbon over time. If the exhaust pipe is clogged, your scooter will run terribly or not at all. It can be difficult to tell if the exhaust pipe is clogged. The easiest way to tell is to remove it and try starting your scooter. It will be a bit loud - two strokes will sound like a chain saw. If it runs with the exhaust pipe off, you know that is the problem

hope this helps

John

Aug 21, 2011 | Sym Star Stratoliner Deluxe Motorcycles

1 Answer

Eton four-wheeler will only start for a second after I spray carburetor with carburator spray help me to get it to run


There are a lot of tiny fuel and air passageways in the carburetor that must be kept clean it order for your scooter to run right. Carefully, take the carburetor apart. This can be relative easy (on a 50cc scooter). The carb has tiny passages that can get gummed up. Your scooter will not run correctly if the carburetor isn't completely clean, so take your time. I use a gallon container of carb dip (you can get a gallon at your local auto supply store).
First, remove all of the rubber and gaskets or they will get damaged. After a 20 minute soaking in carb dip, I blow out the carb with compressed air. You have to get all the jets and the passageways clean. Be sure the jets are clear, especially the starter jet. Sometimes carb cleaner won't clear out these tiny jets. Use a guitar or a piano string, a strand of copper electrical wire, or a tiny drill bit pin vise. Be sure not to increase the size of the hole in the starter jet or you'll change the tuning. Carefully reassemble everything, checking for cracks in the rubber carb boots and the gaskets. Replace them if they are old and cracked. Be sure and remove all rubber and gasket material first or they could get ruined. Spray carb cleaner also works if you're diligent.
If you have an electric choke, check it to make sure it works. Check the resistance between the wires - you should see around 10 ohms or less. Measure the length of the choke assembly. Remove the choke from the carb and plug the wires into a 12V source for 15 minutes. The choke body should be warm. Measure the length again - it should increase by around 1/8".
Next, consider whether your exhaust pipe is clogged. This is especially a problem with older two stroke scooters. The unburned fuel/oil mixture builds up in the exhaust pipe along with carbon over time. If the exhaust pipe is clogged, your scooter will run terribly or not at all. It can be difficult to tell if the exhaust pipe is clogged. The easiest way to tell is to remove it and try starting your scooter. It will be a bit loud - two strokes will sound like a chain saw. If it runs with the exhaust pipe off, you know that is the problem

hope this helps

John

Aug 21, 2011 | Eton JC 125 B Motorcycles

1 Answer

This is an Aprilia Mojito Custom, the 150cc version (I think this an '07, the last year). The carb was gunked up from the rotten fuel we are stuck with today and I cleaned it well and now there is...


Hi,,realy does sound like your fuel pump has had it,,did you have an inline filter,from the pump to the carb? anyway you could discard the pump and stick with good old gravity?

Mar 22, 2011 | 2004 Aprilia Mojito Custom 150

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My sons suzuki LT80 starts fine but but wants to stall out when I give it throttle


could be carbon deposit on the spark plug '' '' a bad coil or cdi unit '' '' clogged fuel pipe '' '' clogged jets in the carb '' '' clogged exhaust pipe

Oct 20, 2010 | Suzuki LS 650 Savage Motorcycles

1 Answer

Scooter starts but stalls after a few seconds. It has been stored for a few months.


Hi, Anonymous if your bike has been idle for months or years and does not want to start you will have to deal with a few remedies:
1. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
2. Remove your air cleaner and clean and re-oil per Mfg. specifications.
3. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
4. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
5. Replace spark plug with a new one and check for spark.
For more information about your question please visit the website below. Good luck and have a nice day.2012 Tao Tao 50cc scooter BMW C1 scooter stall at idle after normal start FOUND IT
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http://www.benelli-scooters.de/pdf/BA_Benelli_Velvet125.pdf
Benelli Velvet 150 2014 service manual DOWNLOAD FREE FULLMANUALS COM


May 20, 2010 | 2008 Benelli Velvet 150

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