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Hi, Richard and the usual suspects are:
1. Idle port, transfer ports, slow air jet clogged.
2. Idle adjusting screw set too low.
3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
6. Float level too low.
7. Float bowl contaminated old fuel, water, dirt, rust, etc.
8. Carburetor bowl vent line clogged/blocked/pinched.
9. Fuel line to carburetor kinked or pinched.
10. Fuel filter clogged.
11. Intake manifold leak.
12. The gas cap is not venting properly or fuel tank venting system blocked.
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.
15. Multi carburetors not in sync.
16. Faulty fuel pump.
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. TaoTao 50cc scooter won run good Help please Scooter dies when adding throttle It Is The Ride http://www.family-motorsports.net/GY6-50cc-150cc.pdf TaoTao 49cc Scooter Parts TaoTao ATM50 A1 Owner Manual
There are many online wiring diagram solutions, but the cheapest way to find your diagram is to purchase a haynes or chilton manual from the local auto parts store. Both have excellent wiring, fuel lines, brakelines, etc diagrams. I prefer the Haynes manual myself.
Provide your lines are correctly plumb then check the carburetor internal filter screen. If it is clogged the primer will not work. On some of the Walbros and Zamas they use an extra tight filter screen that clogs very easily when you have bad fuel lines. These extra tight filter screens can not be cleaned; only replaced.
Here is a basic line plumbing diagram just for reference. If you carburetor has the primer built-in just the primer in the diagram as a line.
in a nutshell: 1 connect top carburetor line to short nipple on primer bulb.
2 bottom carburetor line to fuel line with filter (inside tank).
3 connect remaining fuel line that comes out of fuel tank to the large nipple on primer bulb.
Hi, Sevensons7 always check fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing*
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn*
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working*
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
* If equipped or applicable.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day. Yamaha XJ 700 Fuel and vacuum line diagram Google Search petcock fuel yamaha maxim xj700 Yamaha XJ700N Service Manual OEM parts for Yamaha http://mybikemanuals.com/yamaha/yamaha-xj-owners-manuals
Lots of research has shown a lack of diagrams on fuel line routing. Your carburetor has the purge/primer bulb on top of it. Just to help you understand how it works....the bulb uses a vacuum effect to pull fuel from the tank directly into the carburetor and the check valves in the plate under the bulb (known as the primer base assembly) push any air and old fuel inside the carb back into the fuel tank. On your model, the line inside the tank with the fuel filter on it will come out and go to the carburetor body BELOW the base assembly. The other line coming out of the tank (fuel return line) will go TO the nipple on the base assembly. The lines should be nice and soft and so should the bulb. They all have to be replaced periodically as alcohol, heat and age deteriorate them. Please post back if needed.
Hi: I'm a new user to this forum. I recently had to repalse the 3 fuel lines on my ryobi model #775r. After researching the problem, I diagramed the flow of fuel in order to repace the fuel lines. If you require a copy of this diagram, send me an email . Regards, Tony