I bought a unit that has evidently been sunk so I am having to replace the engine. I have ordered a engine from sbt and am waiting on its arrival. I have gone ahead and removed the old engine, intake, exhaust, starter, water pump and pto cover. My main question is do I have to worry about engine timing as I have read in the manual that there are notches on the trigger wheel so I dont see how I can be out of time. I dont have a problem buying the crank lock tool as its cheap I just forgot to order it and it will hold up my install. Does the lock tool just aid on getting the flywheel bolts to correct torque?