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I have a 2009 jinlun jl50qt-4 it will only start if I hand choke the carb I checked the electric choke to see if there was any voltage getting to it and there is not. I am not sure but I think it needs a new cdi unit am I correct?

Posted by Ronald Archie on

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1 Answer

Gregg Mahin

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  • Jinlun Master
  • 64,964 Answers

Hi, Ronald and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
13. Faulty auto choke or wiring connection.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.youtube.com/watch?v=FnhSfgS0x4Y
https://www.youtube.com/watch?v=t13nwESB0Nw
http://www.family-motorsports.net/GY6-50cc-150cc.pdf
https://scooterpartshop.com/collections/jinlun/jl50qt-4
https://absolutelyscooters.net/pdf/CGEN_dawg_scooter_manual.pdf

Posted on Aug 07, 2020

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5 Related Answers

Benimur

Louie Role

  • 6966 Answers

SOURCE: i have a 50cc moped qt jinlun i just bought anew

Hi and welcome to FixYa,

To my understanding, most of these China made scooters uses a vacuum controlled cut-off fuel valve. Vacuum is tapped either from the carb out or intake coupler to activate and allow fuel flow; no vacuum no fuel from tank. Possibilities are:

  • no or little vacuum to allow fuel flow;
  • vacuum controlled cut-off fuel valve faulty.
A workaround is to install a manual cut-off or bypass it entirely.

Incidentally, the 'revs like mad' is a result of slight overflow when fuel first flows to a starved/empty carb bowl.

Good luck and thank you for using FixYa.

Posted on Apr 20, 2009

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seakish

  • 492 Answers

SOURCE: my electric start dont work.!

The battery is the key. The starters are pretty durable so make sure you a using a charged attery with good contacts. Also, check the fuses, you may have a blown fuse that wil prevent you from turning the starter.

Posted on Apr 30, 2009

Anonymous

  • 957 Answers

SOURCE: TTR 90 wont start. Not carb. Not CDI. Plug cap?

Every component plays a part in the ignition system. Check the wiring as you go. Start at one end and move forward. You have done a lot of work so far. so you should be close. If the igniter is fine and the other components too. Then it would narrow it down to an electrical problem or no signal/pulse to the coil. See if the coil is receiving that pulse. you can use a test light for this test. Pos. will be power and NEG. will be the pulse. With light on the NEG. crank the engine over and see if it flashes. Let me know how its going.

Posted on Jun 01, 2009

Steve Callen

  • 71 Answers

SOURCE: Yr 2000 thundercat, won't idle unless choke fully on

First thing I would try is some sea foam, you can get it pretty much at any auto parts store...put it in the tank per instructions on the bottle, if the carbs are gummed/dirty... seafoam is you best hope at getting them clean without pulling them.

If sea foam doesnt work, you'll have to yank the carbs, but before you do... pull the tank, set it backwards where the seat was, get about a two foot fuel line (air line works just fine) run it ti the tank and start the bike, take a can of starting fluid (WD 40 works too but stinks when it starts to burn off afterwards) and spray around the base of the outside of the carbs where the boots connect it to the intake, if the engibe revs, you have a leak...cracked boot probably.

If no leaks are detected... then yank the carbs, pull the bowl covers and start cleaning....also, while you have them off pull the slide covers off and check the diaphrams on the needle for rips or cracks as well.

Check/clean.. put everything back together... if it still isnt running right then I have no other suggestions... certainly sounds like an air/fuel problem... if were anything else choking it wouldn't make it better.

Posted on Jul 10, 2009

Anonymous

  • 86 Answers

SOURCE: got a four wheeler that has spark and getting gas

HI. YOU MAY BE GETTING GAS TO CARBS BUT IS THE GAS GETTING TO THE PISTON. IF IT WAS ME I WOULD PUT A LITTLE GAS IN THE END OF THE CARB, AND IF IT STARTS OR EVEN KICKS A FEW TIMES YOU HAVE FOUND YOUR PROBLEM. JIMBO

Posted on Aug 16, 2009

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Hi and welcome to FixYa,

To my understanding, most of these China made scooters uses a vacuum controlled cut-off fuel valve. Vacuum is tapped either from the carb out or intake coupler to activate and allow fuel flow; no vacuum no fuel from tank. Possibilities are:
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