Greetings, My name isXXXXX and I am here to help the best I can. My goal is 100% satisfaction. Let's get started.
I believe I do know what you problem is and how to fix it
Your engine is equipped with a compression release
This is because it is a High compression engine
The compression release is not activating
This is why it will not turn past the compression stroke, but spins fine with no plug in it
This would indicate that the valves are out of adjustment
If the gap is too wide, then the compression release is never activated because the valve never is lifted partially up at lower RPMs like is should allowing some compression to bleed off..
Most likely the problem is that the valves need to be re-adjusted. There should be between .004" and .005" clearance between the valve stems and the rocker arms when the valves are completely closed. If this is not correct, then the compression release will not work and the engine will be hard to turn over.
Also make sure that you have the proper amount of oil in the engine.
you are so close to solving the problem
but you need to reset the valves again
Set the valves with the spark plug out
and keep rocking the engine back and forth or tunring it
until you are 100% sure that you are setting each valve at its absolute widest opening or gap
I will locating a service manual which will help you
Are you sure there is compression release on this engine? Other technicians have told us that there is NOT a compression release on this model engine.
99.9 % sure but I will double check
Usually the instructions are in chapter 9 or 10
And here also is the newest version of the owners manual
You should adjust the valves every 12 to 18 months
Wow - thanks! Will check this out and let you know what happens!
of the manual reads
These engines are equipped with an automatic compression release (ACR) mechanism. It is difficult to obtain anaccurate compression reading because of ACR mechanism. As an alternative, use cylinder leakdown test describedbelow.
I guess that settles that...as in the discusison with the other techs
also the valves shoul dbe set at .004 and .006
let me know if you need more help