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Messages - kymco_super_50

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1
Super 9 / Re: Carb/fueling problems
« on: January 13, 2013, 06:10:02 PM »
Thanks for all your comments and suggestion. I still can't figure whether the problem is fueling or something else. It starts fine when cold, I wait for the engine to warm and choke to go off, then it accelerates fine but when I stop at a traffic light engine dies as if it ran out of petrol. I tried increasing the idle rpms but it doesn't seem to make any difference. What else I should check? It stays at idle speed for an hour in the garage, and it runs with 40-45 mph so could it be:
carburetor settings?
Spark plug/coil?
Air/air filter related?
Bystarter?
Reed valve?


2
Technical | How To / Re: Fuel not coming to carburetor
« on: January 02, 2013, 08:00:17 PM »
Update 2: I had another go riding on the roads, and as soon as I turned the corner off my street it died again.  ??? As a last resort I opened the fuel tank in case it helped create the vacuum for the fuel flow. I put it back and tried to start it; it worked again. Went for a half hour ride and worked fine - constant speeds of 40 mph - so I am now completely baffled. I'm hardly confident to go too far from home on it, so I still need to find what causes it to cut off and the next minute to work normally. 

3
Super 9 / Re: Carb/fueling problems
« on: January 02, 2013, 07:56:24 PM »
Thanks MotoRandy123, I will next remove the choke and test it to see if it's working when powered. Meantime, I had another go riding it in the hood, and as I soon as I turned the corner off my street it died again. As a last resort I followed your suggestion and opened the fuel tank. I put it back and tried to start it; it worked again. Went for a half hour ride and worked fine - speeds of 40 mph - so I am now completely baffled. I@m hardly confident to go too far, so I still need to find what causes it to cut off and then to work normally. 

4
Super 9 / Re: Carb/fueling problems
« on: January 02, 2013, 06:21:43 PM »
Update 2: I've just got back from dstairs and did more testing. It seems the fuel is coming into the carb just fine. I turned engine on and removed the fuel line at the carb; full flow. I should have tried this test before. Still the scooter will idle on stand for one hour, but as soon as I go and run it at 20-30 mph for about 2-3 mins, it cuts off, with or without lights on. If fuel supply is not a problem, what else can it be? I cleaned carb yesterday - jets, float, throttle valve. The only test showing a possible problem is with the auto bystarter. It shows 6.4 Ohms instead of recommended under 5 Ohm. Could the auto bystarter cause the engine to cut off after riding the scooter for 5 mins, but allow it to idle for one hour???  Or I'm misreading the digital multimeter (lowest Ohm setting is 200, and the bystarter shows 0.64, so I'm not sure if this is 0.6 Ohms or 6.4 Ohms)

5
Technical | How To / Re: Fuel not coming to carburetor
« on: January 02, 2013, 06:18:31 PM »
Thanks Lee, I've just got back from dstairs and did more testing. It seems the fuel is coming into the carb just fine. I turned engine on and removed the fuel line at the carb; full flow. I should have tried this test before. Still the scooter will run on stand for one hour, but as soon as I go and run it at 20-30 mph for about 2-3 mins, it cuts off, with or without lights on. If fuel supply is not a problem, what else can it be? I cleaned carb yesterday and both jets, float, throttle valve. The only test showing a possible problem is with the auto bystarter. It shows 6.4 Ohms instead of recommended under 5 Ohm. Could the auto bystarter cause the engine to cut off after riding the scooter for 5 mins, but allow it to idle for one hour??? 

6
Super 9 / Re: Carb/fueling problems
« on: January 02, 2013, 04:34:50 PM »
Thanks MotoRandy123, i will give it a try; I did open the fuel tank cap whenever it stopped and also created vacuum in order to get it restarted. Let me go and check.

7
Super 9 / Carb/fueling problems
« on: January 02, 2013, 02:34:41 PM »
Hi,

Happy New Year everyone  ;D My scooter started cutting off after the fuel in the carburetor is spent. I took the carburetor off, took it apart and cleaned everything, then put it all back. Also with the air filter. The same problem; it runs fine (light brown spark plug color) until the fuel from carb runs out. What I noticed is that it has an automatic cock fuel valve, meaning that it needs vacuum from the carb in order to release fuel on the line. Could the cut off be caused by not enough vacuum created for the auto cock to release fuel? Thanks Chris.

Kymco Super9 50AC 2008



8
Technical | How To / Re: Fuel not coming to carburetor
« on: January 02, 2013, 02:30:47 PM »
Update - I found out about the operation of the part 16950 in the image (auto cock fuel) here: "....except the ZX-50 is fully automatic (need documentation though) meaning that it will only let the gas flow when the motor is (for lack of a better word) sucking for the gas."

So, could the cock fuel not operate properly or doesn't receive enough vacuum (sucking) from the carbi?

9
Technical | How To / Fuel not coming to carburetor
« on: January 02, 2013, 12:08:56 PM »
Hi,

Happy New Year everyone  ;D My scooter started cutting off after the fuel in the carburetor is spent. I took the carburetor off, took it apart and cleaned everything, then put it all back. Also with the air filter. The same problem; it runs fine (light brown spark plug color) until the fuel from carb runs out. What I noticed is that when I remove the fuel line (9500B in diagram) from the carb, no fuel is coming. If I blow in the line I can hear the petrol gurgling in the fuel tank. Then I noticed that removing the other line (9500E) from the edge of the carb manifold and sucking air from that line makes the fuel flow freely out of the other fuel line. Is this normal, and what could be the problem? Thanks Chris.

Kymco Super9 50AC 2008



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