SeanKroll
Treehouser
The dealer mechanic told me that my ms660 decomp valve was leaking, resulting in a lean condition.
Not in any way noticeable when disassembled. Snapped open, snapped closed. Maybe it needs to be harder to pop closed. Dunno. Didn't know it could be seemingly fine and be faulty.
The piston ring was broken and it scored the cylinder.
I've seen a decomp valve rattle when the saw ran, and replaced it. I saw a bent decomp valve once, and replaced it.
I got a new decomp valve for my older 460. Figured it's better to change in advance for $16 than the quoted $550 from the dealer for a rebuilding the 660 that blew up.
Lesson learned.
Not in any way noticeable when disassembled. Snapped open, snapped closed. Maybe it needs to be harder to pop closed. Dunno. Didn't know it could be seemingly fine and be faulty.
The piston ring was broken and it scored the cylinder.
I've seen a decomp valve rattle when the saw ran, and replaced it. I saw a bent decomp valve once, and replaced it.
I got a new decomp valve for my older 460. Figured it's better to change in advance for $16 than the quoted $550 from the dealer for a rebuilding the 660 that blew up.
Lesson learned.