80 psi with the decomp operating is about the minimum at which the engine will start and run - you likely have problems. Have you added a teaspoon of oil to the cylinder to see if compression goes up? If it does, this is an indicator of worn rings or cylinder wall.
'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'02 Honda 400ex, DiamondJ +3 A-arm widener, Lonestar anti-vibe
3 scooters - 150, 180, 250
'73 Yamaha CT3-175 Enduro (currently under restoration)
'08 Can-Am Spyder SE5 - my Baby!
And the newest toy destined to suck up all my spare time and money: 2000 Jaguar XJ8