2007 Suzki Quadrunner - Will Not Start

[upchuck]

Hey guys got a 2007 250 quad runner owned her from new never had a problem with it till last year the kid was driving down the drive way and it shut down and has never ran a second since I cleaned the carb checked and have lots of spark and compression thought may be he jumped the timing as he likes to pull away in higher gears but it looks good any ideas

[oxidized_black]

have you checked valve clearence ?

i suspect they are too tight ...

[upchuck]

I have not but just found the specs and next on the list thanks