Adjusment of decompressor

I presume you lined up the rocker timing before removing the shaft ? if not then the valves will be out of order for up/down

Hi Kerry,
The decompressor valve is there to make starting easier. All you need to do is to push the button in before you try to start the saw. As soon as the engine fires, the button will pop out and the saw will then operate normally.
Just remember that if you pull the saw over and it kicks, but does not start, you'll probably need to push the decompressor in again.

If it is an OHV engine it may just need a valve adjustment; although, decompressors do fail in these engines.

Check your valve adjustment first as these uses a decompressor that on the camshaft itself.

Now while checking the valve clearances as you go past TDC of the compression stroke there should a little bump on the intake valve when the decompressor is working. If this bump is not there and the valves are set correctly then the decompressor has failed and requires the cam to be replaced.

10 276781SingleCylinderOHV pdf

I recently bought a brand new 372XP and spent the first day trying to start it as per the instruction manual with no success, never even fired once. Removed the plug to find plenty of fuel and that the plug has a good spark. Left it until the next day mainly to allow my arm to recover (& scour the internet for clues). I found a forum that said not to use the decompressor and sure enough without the use of the decompressor button it fired first go with the choke on then I reset the choke & it ran properly on the second pull. The decompressor button can be reset with fine nosed pliers or removal of the top cover by undoing three screws. Good luck it's a great saw once you know how to start it.

could be timing.

recheck timing
recheck valve clearances
check for inlet and exhaust manifold leaks

You likely need to get the valves adjusted,it sounds like the decompressor is not working.You need to get the compression down to 130 lbs while cranking or the starter can't overcome the compression.Try turning the motor past the compression stroke by hand and see if it will crank faster,if so then the decompressor is out of adjustment.If the decompressor is not just a lob on the valves then you need to call the repair depot for craftsman and find out what you need to do to fix the problem.If none of the above works then you may need a battery,or just clean the cables and battery posts.

Sounds to me like the decompressor is not working.You need to find out what this engine uses for a decompressor,whether it be a valve adjustment thing or a linkage thing,the dealership service manager should be able to give you some guidance.

when you changed the cam, did you reinstall the decompressor onto the new cam?

try moccs place or intruder alert that will help