I'm searching for another Harley. It will be one of the larger models, most likely range from 1990 to 2004. Is there not a general range of what the compression should be, say for example, I'm eyeing a&nbsp\\;2004 electra glide police special. I know airplane jugs are from 60 to 80 lbs. It must be a closely held secret. When I ask the most seasoned Harley owners that question, all I get is the deer in the headlights stare. Including, the guy that is trying to sell me the electra glide. He's been riding harleys for 40 years.

 

Something in the range of 160-180 would be a good target to set on the later engines. The evo's (pre 2000 or so depending on the bike) would be just a bit lower if they were in good condition. Non stock cams will make a difference in the compression pressures also.