helppp very urgent !!!!!!!

[elyk121]

i bought my kymco zx 50 from crash damage only 2000 miles on the clock with  tiny bump on the back which was the reason it was in there any when i start the the scooter it goes normal for a bit at full throttle after that it jumps then the speed drops down no faster than 10mph this is at full throttle i have new spark plugs engine brand new really what else can be the problem please this is urgent!!!!!

[skippy]

check and clean the carb as if it has been stood there may be dirt in the carb. there is an idle jet for tick over which seems fine if on tick over but to full throttle it has another jet. if that one has dirt in then that could be the problem.

[elyk121]

Do you reckon this most likley to be the problem and were is the carb ?

[juice]

Youtube has many instruction videos for cleaning scooter carbs . Good luck .

[elyk121]

Do you reckon there could be any other problems apartment from the carb which it could be like

[Peters]

Loose/corroded/damaged wiring... But more than likely it's crap in the carb

[elyk121]

Okay thanks for yah help

[oldschoolsanta]

I had the same problem check the clutch and variator.

[elyk121]

Its a rev and go so wouldnt have clutch would it ?

[juice]

Your zx has a centrifugal clutch as part of the transmission . Did you ever get it running better ?

[elyk121]

A have cleaned it but still the same going to try a new cylinder head see if that works

[LoveMyKymco]

Did you get all the old gas out of the tank? It sounds like it could be a few things but bad gas is first thing Id check out, then for air leaks, or worse loose carb. Itll be simple and I wouldnt think a new cylinder would be needed at 2000 KM, its like 1200 miles.

[CROSSBOLT]

A new cylinder head sounds like throwing parts at a problem until it goes away. Real expensive and rarely fixes the problem. Start a systematic approach to eliminating possible causes. Start with cleaning the carb and fuel tank/lines and then call us for the next step.

Karl

[Peters]

I agree, diagnose first. A compression test is the first thing to do before you start replacing parts. Hell, you can even borrow a compression tester from Auto Zone for free.

[CROSSBOLT]

OK, elyk, what's the story? Did you get it fixed?

Karl