A few weeks ago my bike fell over ever since then I haven't ridden it but when I start it it sounds like this what do I do?

It won't let me put the video here my phones being stupid but here's my channel www.youtube.com/191snyder.
It's the first video.

 

Sounds like it isnt running on all cylinders. When its cold, start it, and carefully feel the exhaust pipes coming off the head. I bet one or 2 are colder than the other one(s). Or stays cold longer than the other ones. But eventually warms up some. But either way, sounds like it not running on all cylinders.

 

What CMF says. I do not believe it's running on all cylinders. I'm guessing it's something fairly simple though. Do what he said and feel the exhaust pipes. If you isolate the cylinder, start easy and check the plug for the cold cylinder.

 

You're missing on a cylinder, or two.

Probably 1 of 3 things.

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All of which result in a misfiring engine, and all of which could easily happen during a tip over.

 

One possibility is that the spill dislodged some crap inside one or more carburettor(s) which then found it's way to the jet(s) clogging it. A bit of a far fetch but a possibility none the less. Whatever it is you're definitely missing a beat. Start with the plugs as they are the most obvious.