2005 Tank Urban Sporty 50cc gas scooter-- has been losing power and is slower than usual?

Question

First off, I'm skinny, weight is not an issue. I checked air filter, spark plug, and check to make sure hoses and things were intact. I changed motor oil and the gear oil. I havent looked in the carb yet cuz i have never done that. It looked great like 4 months ago though. Im not sure what all the battery would do while its running. THIS is an example of what happens-- i pull out of drive way, it picks up( still not as fast as it did) and about 200 feet or so later it just winds down slowly until it just dies out. THEN after it dies, when i try to start it, the sound of it starting sounds funnier than usual. i could explain it like-- a heart monitor. The normal beat would be the normal winding sound of pretty much any car or whatever. Mine kinda flatlines-- like one long winding sound without a break- like wuhhhhhhhhhhhhhhhh....... rather than wuh..wuh..wuh..wuh..wuh. But it eventually starts. It also wants to die on me when stopped sometimes. Its NOT the idle. Moped dealer miles away.

Answer 1

Sounds to me like a battery issue...maybe a dead cell, when it switches over to charge it, the battery is trying to draw too much of the juice and the bike wont get a good ignition... its not burning clean, loads up in the cylinder and dies. Let it set, the battery gets some of it charge back as it cools down, and starts the bike.

Could be wrong, but that may be it. Have the battery checked... Autozone will check the battery for free most likely...and free is a good way to eliminate one could be cause.

Good Luck!!!

Answer 2

It could be your belt.  I understand  about working on one we do not and we did as a favor and I would quit before ever working on a tank again.

Answer 3

battery could be dying (i'm assuming it's electric start because of how you described the sound of the engine, to my knowledge a kick start can't make that sound) starter motor could be going out, you said you checked everything over so i'm going to guess it's NOT a loose connection

fuel mixture could be off too... or your carb needle/carb idle s***w/carb jets could be out of whack....

in short there's alot that could be wrong with it... start with the simpler/cheaper stuff first... get a new battery, ensure the starter motor is fine, clean the carb, (and try and diagnose lean or rich fuel mixture and change it)

Answer 4

I dont think it would be the battery... while it is running the AC generator should be taking care of all the electrical... unless it has gone bad.  Aside from that, in addition to the stuff you already checked, also check the vacuum lines for any leaks and also check for any clogged fuel lines or fuel filter... even a clogged carb jet.