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Probably not your problem being it is drinking fuel, but I will throw this out there just in case. My 19 UVX 700 will not go over 7-8 mph unless my driver's seat belt is fastened. Could it be a bad switch in the seat belt? Are you are using the belt?

If anyone North Carolina or Virginia wanted a 450i there is a dealer, Brewer Cycle in Henderson NC, that list two. They are leftover 2022 that they have marked down to $5500. Pretty sure tax and shipping fees not included but still that is one heck of a price! Just thought I would share!

There is a little magnet sender on the 450i units. It is located by your left ankle when setting on the machine. Pull that cover off and you should see the wires for it and connector if they are the same for a 450 and 500. Think there is a magnetic piece that slides inside. You can try cleaning it first. I would do that and mine would start working for a very little bit of time. Replacement cost me like $60.00, best I can remember.

Weird, I had high hopes for the screw limiter. My zero turn mower just did the same thing. It is suppose to run around 3400 rpm. It dropped back to maybe 2500 rpm max. Keeper for the throttle cable broke. The keeper doesn't allow the outside cover of the cable to move. Had to replace it and now everything is good. I don't know if your MXU cable is the same but it is mighty ironic that just happened to me. So check both ends of your throttle cable!

Good luck!!
Glenn

I had that problem more with my MXU 450i new than my UXV 700i. Both take the same NGK CR7E sparkplug. On my MXU I replaced the NGK CR7E with an NGK CR6E. That is a one-step hotter plug. That greatly reduced the stalling on it. I would suggest trying the one step hotter CR6E plug.

This may not have anything to do with your current problem, but I will mention as a possibility. I bought a pair of NGK spark plugs off Ebay. They were stamped NGK and came in what looked like NGK boxes. They were for my grandkids atvs. A Kymco 90 and Chinese 110. Both of those plugs started failing with very low hours. When I say failing, I am talking about missing, running rough and finally not at all. Like maybe 5-8 hours of riding. In hindsight I believe they may have been counterfeits. Mainly because I bought the same plugs from somewhere else and have had no more problems with 4-5 times the hours on the atvs now. Just a thought!

Had one more thought? Did you buy this new? If not, maybe the throttle screw has been turned in some. Possibly due to a younger driver that the previous owner wanted to reduce the acceleration and top speed some. Right at the throttle thumb lever on the front side you can see the adjustment screw sticking out. Try a couple of turns out and see if that makes a difference. If not just screw it back to where it was. If that is it post back and I can measure how far mine is out. You could then set it the same. I have never touched mine so it should be factory setting.

I think you are correct Airshot. The Tracker also uses the 450 Kymco motor. May build the whole thing.

Ebay has plenty of Kymco ignition switches with keys included. Prices not bad too.