meanstreakmark
Thinkologist
Hi all, it's been awhile since I've been on here, and wow... I feel like I've forgotten everything I've learned. (Mad cow disease!) So, I'm hoping to be pointed into a direction-
The issue is a hole in the right-hand piston, and what would have possibly caused it.
After sitting for a couple years with only intermittent usage, I loaned my xs to my son as temporary transportation for a couple days while he got his car fixed. He knows my love for xs's and that this engine has never been rebuilt, and to not 'get on it'. Well, it ran fine, no issues, until the third day he was riding to my house and lost power about 3 blocks away. Today, i started it; it was only running on 1 cylinder; it wasn't the carbs; I did a compression test... left cyl was 163 psi, the right was 0. I looked into the spark plug hole with a high intensity led flashlight and observed the hole, about 1/8 wide and 3/8 long. Rotating the crank slowly, it seemed that both valves were opening and closing correctly, meaning that they weren't hitting the piston. That's as far as I went. I know I'm in for a rebuild, but I'm just wanting to know why this happened. Any ideas?
1981, pma upgrade with pamco about 3 years ago, new coils/wires/boots/iridium spark plugs (Mike's), everything else original except filter pods on carbs, went up a couple sizes on main jets, original pipes/mufflers.
Thanks for any input-
The issue is a hole in the right-hand piston, and what would have possibly caused it.
After sitting for a couple years with only intermittent usage, I loaned my xs to my son as temporary transportation for a couple days while he got his car fixed. He knows my love for xs's and that this engine has never been rebuilt, and to not 'get on it'. Well, it ran fine, no issues, until the third day he was riding to my house and lost power about 3 blocks away. Today, i started it; it was only running on 1 cylinder; it wasn't the carbs; I did a compression test... left cyl was 163 psi, the right was 0. I looked into the spark plug hole with a high intensity led flashlight and observed the hole, about 1/8 wide and 3/8 long. Rotating the crank slowly, it seemed that both valves were opening and closing correctly, meaning that they weren't hitting the piston. That's as far as I went. I know I'm in for a rebuild, but I'm just wanting to know why this happened. Any ideas?
1981, pma upgrade with pamco about 3 years ago, new coils/wires/boots/iridium spark plugs (Mike's), everything else original except filter pods on carbs, went up a couple sizes on main jets, original pipes/mufflers.
Thanks for any input-