You are measuring pressures from idle with no ignition. There is vastly higher pressure when running.
By the way the three cylinder has stock a different reading . From the service manual:
NOTE On 90 hp models, compression on the No. 1 cylinder is normally 5-10psi (34.5- 69.0 kPa) less than the No. 2 and No, 3 cylinders. Refer to Table 2.
A variation of more than 10-15 psi between 2 cylinders indicates a problem with the lower reading cylinder, such as worn or sticking piston rings and/or scored pistons or cylinders. In such cases, pour a tablespoon of engine oil into the suspect cylinder and repeat Steps 3 and 4. If the compression increases significantly (by approximately 10 psi on older engine), the rings are worn and should be replaced. Some 2-stroke engines are plagued by hard starting and generally poor running for which there seems to be no good cause. Carburetion and ignition check out satisfactorily and a compression test show that the pistons, rings and cylinders are in acceptable condition. What a compression test does not show is lack of primary compression. In a 2-stroke engine, the crankcase must be alternately under high pressure, then low pressure. After the piston closes the intake port, further downward movement of the piston causes the entrapped fuel and air mixture to be pressurized so that it can rush quickly into the cylinder when the transfer ports are opened. Upward piston movement creates a lower pressure in the crankcase, enabling the fuel-air mixture to be drawn into the crankcase from the carburetor.
