@dvpatel - thanks, just had the muffler bearings done at Crank's last year. Good thing, too - they were getting a little noisy. What are the piston spring tension specs, I'll get them to check tomorrow....Y'know, with the age of our 3rd gen vans, the muffler bearings should probably also be changed at around this time. And it's probably time to start thinking about piston return springs as well. It's good to be proactive on those.