My son just bought a 1993 1400 suzuki intruder with 1500 miles on it. It has doesn´t have the power it should (has a hard time maintaining 65mph). After riding it, the exhaust pipe from the rear cylinder is hot, but you can still put your hand on it while the front pipe will burn you. We installed new plugs, checked compression (120-130) and checked spark. It appears that the rear cylinder might not be firing as rapidly as the front(although it might be my imagination). Any ideas?? Thanks, Dave