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OK, so there's a second scooter with 800 on the odometer. I didn't mention it before because the fuel pump had been scavenged from it, so I was trying to get the higher-mileage one going.

I'm not getting anywhere with the one we've been talking about, so I swapped pumps to the second one. Even with a good, brand new battery, it's slow to turn over at first. It throws codes 6 and 12. Also, the fuel pump that ran fine in the first scooter won't activate at all in the second. Would having unplugged the brake lights affect anything? (I kept the cowling off since I swapped fuel tanks.)

According to the service manual, code 6 is a "P0560 Battery voltage malfunction," and code 12 is a "P0230 Fuel Pump circuit malfunction."

I feel more hopeful about this one, because it doesn't make that hollow knocking sound you can hear in my video. Any ideas on what I could do with it? I really appreciate all the great ideas from everyone so far.

Guys - turn your kill switch to "not run" --- try to start your LIKE200i.
Mine does not make that strange hollow sound at each revolution like his does in his video. Like tapping an empty Coke bottle on the bottom....or something.

Do you hear it, too? Or am I hearing something normal?
To me it sounds like someone starting an engine with the spark plug removed - except the engine would be spinning freely - so it's not that.
1) Is the air filter in place, and not wet....cover closed, hose connected securely to the throttle body?
2) OK - other end of the throttle body > Is it possible the intake manifold is cracked or not fully seated and leaking air?
3) Any pulses from the tail pipe when starting?

We have finger pushing compression; a good spark; injector spraying fine mist; "flooded" smell of unburned fuel after repeated attempts and wet spark plug --- YES?

Stig

That's the sound I was talking about! It can't be normal; I've never heard it from an engine before. To address your questions:
1) No, I haven't tried with the air filter on, and I'll check the connections.
2) That's very possible! I'll check. The bike hasn't been wrecked, but there's been at least one hard fall.
3) I'll see about that. Do you mean the pipe/muffler would shake, or I would feel pulsing air from the end of it?

Yes, all that is correct, except I can't determine a flooded smell where it is because there's an old tank with old fuel in it. There was a little dampness on the threads the last time I removed the spark plug after trying to start it, though.

Here's the video. Ruffus, I've checked fuses, kill switch and just bought a new OEM spark plug. I haven't done the other things yet.

It's making almost a gasping sound, like"dokk, dokk, dokk." Any idea what that could be? Should I upload and link a video?

Was it running when put away?
Not sure what connecting your terminals to a running car will do.....was told never to do this with a running car.
Please check your fuses down there in the battery area.

Now buy a good new OEM equivalent scooter battery and install it. 12V at least 8Ah.
Once you've checked for good fuses - give it a start - remember - do not touch the throttle when starting this EFI scooter.
Turn key on, pull the brake lever, check that the rear brake light is working when you pull the brake lever with the key on,  push start button. If NO brake light - pull the other brake lever and check that brake light is lit.

Report back with your results with a proper battery installed.
Owners have reported a variety of "no start" reasons --- including starter button wires have been fiddled with inside the handlebar panel by a previous owner.

Stig

I don't know if it was running when parked, but it looks to have sat for about 5 years. The fuses look good. What if neither handle activates the brake light?

I'll buy a proper battery this week and check the voltage at the cigarette lighter.

You might be able to tell if there is no compression....when attempting to start the motor will spin somewhat freely - like a sewing machine.
At 3000 miles/Kms doubt anything has occurred to destroy compression.
So, f u e l  delivery?
Stig

Yes, I've confirmed the injector is spraying. The kill switch is also operating as it should be. There also seems to be plenty compression. Still, it doesn't seem like it's igniting anything, even starting fluid. There's spark, but don't know if this is the correct plug for it. Try another spark plug? Also, I noticed that while the check engine light comes on for 2 sec then off as it should, there's a shirt flash as soon as I press the start button and it begins to turn over. Does that mean anything?

Hi, I just  bought a 2013 Like 200i that turns over just fine but won't start. It's probably been sitting for years. The spark plug looks new and fires, and the gas and tank was clean, but I got the fuel out and replaced with fresh 100% gas anyway. The red light on the gauge cluster shines for two seconds and goes off, which should mean no codes, right?

The fuel pump works for 10 or so seconds after turning to "ON" and will pump a stead stream of gas. The killswitch is set to "ON" (which I believe is the icon without the "X"). What else could I try? The spark plug is NOT wet when I remove it after trying to crank, so I have to assume fuel isn't getting into the cylinder, but is there any sort of relay or safety function that could be preventing starting?

I don't have a scooter battery, so I'm trying to crank it with jumper cables from a running car, with the positive on the scooter positive terminal and the negative on the scooter frame. Shouldn't this be fine and provide plenty voltage? It seems to have plenty starting power.