Motorcycle Questions? Ask a Mechanic.
Hi and thank you for your question.
I suggest not jumping into replacing parts just yet until we have reasonable certainty we are replacing truly faulty pieces.
The first thing I would like you to do is put a volt meter across the battery terminals in parallel, get a DCV reading with the key on, then hit the starter button and see what the voltage drops to. If it drops more than 1.5 volts, it would call the battery into question.
One more thing you can take a quick look at is clean and tighten all battery terminals.
If all that looks good, pull out the spark plugs and see if any of them seem to be completely gas soaked.
Let me know what you find with that and we can move forward from there.