60 p.s.i.
Stihl web page lists minimum as 110 lbs of compression
Look on the Gas cap of your weedeater. It should tell you the gas to oil ratio. If its not there try looking in the manual or online.
14:1 compression
120psi
Alot.
9:1+
When good it should be around 120-125
150psi
It should have a minimum of 70 psi.
Compression anklets, socks, or long hose should NOT cause bruising. Most likely, the hose are too tight, too much compression. Talk to your doctor for a prescription for a lower compression product.
A yamaha blaster should have at least 120psi 150 is recommended
150psi , per. cyl. J.H