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This sounds like the ignition timing is off. check the stator mounting screws havent come loose under the left engine cover, and check the flywheel hasnt sheared the key. turn the flywheel to TDC mark and check the piston is at the very top, with a pencil or similar down the plug hole(dial guage is best)
11.3 indicates that your staring out with a low battery.
a fully charged battery should be at least 12.5 volts before you even start the bike.
Once the bike is started the voltage meter should read 12.8 + volts at an idle.
Once the bike is reved to 2000 RPM the voltage meter should read 13.75 - 14.80 Volts.
I would start withe a good battery. Have it load tested before you install it to ensure it is a good battery. Your local auto parts store load test them for free.
Sounds very much like you have some sort of air leak in the induction system, check the Sync Ports have their rubber plugs installed. Check for any hissing noises, if you hear them follow to the source
Take one of the plugs out and hold it against the head while the engine cranks. You should get decent spark. If not, you have an ignition problem. If it gets decent spark, try spraying some starting fluid into the air cleaner box. If the engine starts up and runs for a couple seconds, you have a fuel delivery problem.