Question about Jinlun Motorcycles
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.
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Posted on Aug 07, 2020
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:
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
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
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
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
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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