[AT] Compression values and range

[DAVIESW739 at aol.com]

Dean,
  A perfect engine should be within 10 percent on all cylinders but on  old 
tractors like ours I would say you are Ok it should run good if all were at  90 
lbs. My Case LA it 90 to 105 and runs strong and starts easy. A lot of them  
with lower compression ratios would have 65 to 80. so you are Ok on that your  
problem seems to be spark do as i said to check it from battery to spark plug 
to  make sure its OK.
You can put some oil in the cylinders that are low and if they come up then  
you have bad rings if not then you have a burned or not seating valve.
 
Walt Davies