Yamaha G-16 Turns Over But Will Not Start

[BCGC]

I have a Yamaha G-16 that turns over but will not start. No compression where do i look?
4 stroke yamaha

 

[HotRodCarts]

First thing I'd do is pull the valve cover and make sure everything is in tact. Check valve lash. If that all checks out a tear down is in order.

 

[Nubs]

may have a stuck valve if its been sittin' for a while.

 

[BCGC]

thanks, i have a lot of junk right now but i'm trying. to get them all running

 

[djlan99]

These will not have compression while cranking the engine over if the throttle plate is closed.

Rework was to remove idle speed screw due to fouling b4 plugs ( not needed ).

No air can get into the combustion chamber and because of that make sure you open the throttle a bit while cranking to test compression.