Honda 185s engine timing?
Make sure the keyway on the crank has not broken and thrown the timing way out. The easiest way to check is to take the slotted plug out at the zippy and line up the "T" mark on the flywheel against the indicator arrow on the case. Then take out your plug and shine a flashlight down and see if the piston is at the top. If not , its probably the keyway or jumped a couple of teeth on the cam.