STARTER WOES

[HOTHED]

I HAVE A '95 HERITAGE. WHEN I PUSH THE START BUTTON, THE STARTER ENGAGES WITH THE RING GEAR BUT DISENGAGES BEFORE CRANKING THE ENGINE OVER ENOUGH TO START. I HAVE REBUILT THE SOLONOID, AND REPLACED THE OVERRUN CLUTCH,BUT STILL DOING THE SAME THING. ANY ADVISE OR IDEAS WOULD BE APPRECIATED, AS I HAVE PULLED OUT ENOUGH HAIR TRYING TO FIX IT.