Originally Posted by michaelmrc
so your saying im better off not pulling the decompression lever. i have heard that spinning it too long will allow the raw water pump
to fill up the exhaust
and could cause hydrolicking in the cylinder causing a bent connecting rod any truth to this.
Sorry, I must not have been clear on what I said. Using the decompression lever is helpful because it allows the engine to spin faster. When you flip the lever back and the engine has compression, it will generate more heat because the piston is moving faster so leakage matters less and overpressurization (good for starting) matters more. This benefit is very short lived because the engine will slow back down to its normal cranking speed quickly however, you only need to get it to fire once usually. It will certainly never make it harder to start. On some engines it provides a benefit from building fuel
pressure required to pop off the injectors as well.
You are correct to worry about a hydrolock situation but that is a risk with any long cranking. For this reason, only hold the decompression lever long enough for the engine to start spinning as fast as it can (battery voltage is the limiting factor here) before engaging it.
I hope this clears it up, you are doing the correct thing, I was just trying to explain why.