i have a 83 royal with only 10,500 on it, was my dad,s bike, he passed on i got it when it had 6,400, it seems the rear shock likes to be a low boy when i put my lovely 135 pound with on it, i maxed the air pressure to 85, i didnt go higher then that, it still grinds the mud flap , lost a 1" already off it ... eekk,,, i bought a shock on ebay, it says it was off a 83, but this one has no coil around it,i have the computor control air supention on it, the other shock dont, i,m thinking about putting rubber spacers on the stock shock, like you do onn race cars when you want to increase spring pressure, or should i try to modify the new old shock to work with the air ride,, or plug rear line that goes to the compresor, and manual air up the new shock, input please, is this one of the weak link in the ventures of that year?? thanks herb in ohio