issues starting 06 yz450f

up until yesterday my bike started first kick with giving it a couple twist of the throttle.

I let a guy take it because it was bogging a bit in top end and would act like it was going to stall. he says he rode it for a little bit .8 hrs to be exact and then he changed the oil. after changing the oil he started it up and then shut it off. the next day when he went to bring it back to me the thing wouldn't start. i immediatly took the plastics off to take the plug out. lots of spark so spark is not the issue. I smell fuel so I don't think that is the problem either. Would anyone have a solution or a quick fix to get this biking working again.,

also the bike has alot of compression.. too hard to kick over in running shoes.lol

Cam timing.

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