There is a small tab that the exhaust valve will lift from when you are first turning the engine over. This tab is connected to a set of cammed weights with a very small spring to keep it popped up to relieve compression. Once the motor starts running the weights overcome the spring and lowers the tab out of the way of the valve. You will have to pull the head off and turn the flywheel by hand. On the compression stroke you should see the exhaust valve lift slightly. If it does not lift either the tab has broken or the spring has slipped or broken. You can see the spring on the cam if you pull the cam cover from the side of the motor.
Compression release tab:
CR spring:
__________________
DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
|