20 Most Recent Kymco 2011 UXV 500 4x4 - Page 3 Questions & Answers


Change the plug and make sure the fuel line is not restricted. A restricted exhaust would also cause this problem. Will it rev higher if you spray starter into the throttle body when revving it up?

ATVs | Answered on May 10, 2019


If engine does not turn over you need to see if the starter is getting power and if it is any good. Also look for an inline safety switch for the starter that may be stuck in the open position and not allowing the electricity to enter the starter motor.

ATVs | Answered on May 10, 2019


if it is hot where you are id say no. synthetic might be ok but its gonna burn it off fast.

ATVs | Answered on May 07, 2019


a back fire on a bike is usually the cause of timing being out or damaged carburettor ( too much petrol going through ) in the case of the carb you can adust the air screw to see if that helps ( small screw in the side of the carb ) screw it right in and then bring it out 1 and a half turns ,this will get you very close to the right mixture. in the case of timing being out you will need to take the fly wheel off and adjust the stator plate ( turn it to the timing marks ) as a rule its usually . back fire through the exhaust is timing,back fire through the carb is fuel mixture. if you rev it when it starts and it pops through the exhaust the problem is within the fly wheel . if it pops through the carb the problem is with mixture.

ATVs | Answered on May 05, 2019


Check your choke setting.

Have you had any maintenance done on it lately?

ATVs | Answered on May 04, 2019


johnny bonacci May 03, 2019
I would try backing out the air/fuel mixture screw about a 1/2 a turn. Sounds like you have a rich mixture, those back fires you hear are unburned fuel.

ATVs | Answered on May 03, 2019


needs tune up --carb problem --cleaning rebuild or replacement

ATVs | Answered on Apr 30, 2019


I would think it has something to do with fuel delivery. When your putting the gas to it something has to replace it..normally air goes in its place...If your gas cap isn't letting enough air back in the tank, your engine will become starved for fuel . Try loosening the cap & try going fast. You may just need a new gas cap.

ATVs | Answered on Apr 30, 2019


It's likely to be either spark or fuel.
Remove the spark plug and inspect it. There are pictures of good and bad plugs on line, the plug can tell you a lot about the fuel mixture and how well the motor is running.
Check that there is a spark jumping the plug gap when you turn the engine over (the plug body metal must be touching the engine metal to complete the spark circuit).
It's worth trying a new plug in case the old one has failed, even if the spark looks ok, sometimes a plug only fails when under pressure.
If there is no spark, check the ignition wiring (particularly connectors), kill switch, key switch, coil etc. You might have to get an expert to test these things for you.
If there is a good spark and a new plug makes no difference then it could be fuel. Easiest way to check is to get a can of Easy Start or similar and spray it into the air intake as you try to start, if it starts then look for a fuel problem.
Make sure there's enough fuel in the tank, the tap is on (try on reserve too), the hoses are not kinked or blocked.
If it's a blockage in the carburetor it's probably best get a mechanic to check/clean it.
Good luck.

ATVs | Answered on Apr 29, 2019

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