I just bought a 14 ft jon boat with a 20HP Chrysler. The motor will not reach high RPM's. Compression was 120 and 110. It has a hot spark while cranking. I'm guessing the problem is in the fuel system but I'm not expirienced with 2 stroke outboards. Any tips or suggestions? Also, the starter will only engage the flywheel maybe 1 out of 5 times. The motor will spin and it will throw the drive out but it will not engage. Any ideas?