Why does my scooter shut down when running By smokingsmarties (Read 1,588 times)

[smokingsmarties]

My taotao 50cc scooter only has 700 miles someone stole it from me and tore the ignition and I put a new one on it ran perfect before they stole it but now it starts perfectly but the engine runs and once you go down the road and you get to 15 mph on flat land it loses power then shuts down when it reaches 20mph or 16mph. Once shut down it won't start you let it sit for 30 seconds and it starts back up but keeps doing that can any one help me?

[czmdiver]

Most likely your Valves need adjusted. they should have been done when the Scoot was uncrated. at 700 miles its Overdue..
From what you describe sounds classic text book case of valve adj..
The Valve Lash comes tight from the factory, so once you have some milage on them the Lash or Gap closes to Zero Clearance and once the engine heats up the Exhaust Valve Wont Close all the way and you lose power and she dies, then once she cools down will start back up then do the same thing again.
There a a bunch of videos on how to do this..
Good Luck

[cyborg]

Good point diver,,I'd also be looking at fuel tank venting as well,,,after it stalls out open the gas cap and if you hear air rush in it needs a vent hole in the cap,,,I'd do the valves first tho

[crwford]

why not just do the gas cap first sure sounds like fuel problem to me. If it were a valve lash problem I see little chance of it changing in 30 seconds. My Ice Bears have better then 8,000 miles in them none have had the valves touched

[smokingsmarties]

It's got good pressure and stuff and I've changed carbs all of them outa 7 do it even with different cdi and voltage regulators I'm seriously thinking it's the exhaust valve

[crwford]

have you checked the fuel flow yes or no ?

[smokingsmarties]

Yes I have and it's getting gas pretty good I thought that was an issue at first to be honest but it wasn't

[cyborg]

Do the valves like diver suggested we'll go from there

[smokingsmarties]

Do I losen or tighten them

[kz1000st]

On a 50cc GY6 the valve clearance is set at .002 inch. That's not a lot and they can tighten up fast. It means you have to loosen them, more than likely.

[smokingsmarties]

Ok thank u

[cyborg]

My suggestion is to go to you tube or the library here and watch a few videos on valve adjustment procedure ,,,by the sound of your questions it does sound like this is your first time doing mechanical work of this sort,,,you need to know not guess what you're doing

[smokingsmarties]

I work on street bikes and customize cars and stuff. I can figure out every one else's problem with the mechanics but mine

[czmdiver]

[czmdiver]

The mighty GY is as simple as old School Briggs Tiller or Mower engine, as basic as it gets.