I'm a little confused. Did you friend drop it, and then it started running like crap, or did your friend drop it while it was running like crap, and now it is running fine? Your last post has thrown me for a loop.
I'll go on the assumption that it has been running bad since the drop on the right side.
When the bike was on its right side, there is an air injection tube in the front of the carbs. When the bike was tipped over, the fuel would have emptied out of the float chambers, and gone into this tube. When you straighten up the bike again, there wasn't any fuel in the carbs, hence the hard starting.
There are two possibilities for why the bike doesn't run right. First, the fuel has gotten into those air injection tubes, and is bugging things up as you push the engine for more power. The cure for this is to take off the tank, and open up the air tubes, and drain out any trapped fuel, or just ride the bike, and things should settle themselves out after a while.
Just go easy on the throttle. Slowly twist the throttle until it starts to stumble, and hold it there for a couple seconds. It should clear up as the fuel gets sucked into the engine and burned.
The second possibility is that during the drop, the floats in the carbs got knocked out of position, and as you accelerate, the carbs aren't able to supply enough fuel to run the motor. The cure for this is to open the carbs, and inspect the float heights on all 4 carbs.
These are the two items that are the highest possibility of being the culprit. Ita also possible that one of the spark plug coil sticks came loose from its spark plug, and needs to be pressed back into place. Plus about a dozen or more other possibilities.
Quickest way to fix the problem is take it to a trusted, knowledgeable bike mechanic, and let him troubleshoot it properly.
Good luck,
BC
