Compression Test

[Scott M]

I have a ZZ4 350. not the fast burn, the one with the l98 heads.

Question is I did a compression test while changing the spark plugs and the numbers i got back where:

180   176
182   178
178   200
172   180
PF     DF

Do i need to adjust the valves in order to fix the compression on that cylinder which was 200.  I do not know enough about any of this so I would be taking it in to the guy who rebuilt if a few thousand miles ago. At one point in time shortly after the rebuild I did mess with the arm nut on a couple cylinders but dont remember which one(s). I was under the impression that I had a loose arm but it turn out it was timing and pinging.

I know i am probably going to get the look of this guy is dumb and going to mess something up but I am just looking for guidance.

Edit: I am calling them the arm nut cause i dont have roller rockers they are the saddle looking rockers and I apologize for not knowing the proper name

Thanks,

Scott

[VileZambonie]

Explain how you did your compression test. Did you have a battery charger hooked up, all plugs removed, choke open, wide open throttle 3 compression strokes?

[Scott M]

I feel so stupid cause I did not have all the plugs out, my choke is electric and didnt have a battery charger hooked up... I shouldnt have "ass"umed it was so easy and should have looked it up. I will retest and report back if this is proper procedure. Also I had a hard time cause my starter keep jumping off the flywheel if i tried cranking it over more than a couple of turns. is that normal? 

[VileZambonie]

No that's not normal. check that it is properly mounted and shimmed. Check the teeth on the flywheel.

 Unless the test is performed properly you will find very inaccurate and inconsistent readings.

[Scott M]

Okay will do, i appreciate the help! Ill look into the starter as well