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I bought an 07 RMK 600 that needed some work. Here is the story. Original motor burned down due to carb boot failure. New crank, rods,pistons....
Motor failed again early after the rebuild. PTO piston is destroyed. Piston top chewed up and so is the head and cyl. New cyl, head and piston on their way.
For prevention, I tore the mag side down also and it has issues also. in looking @ the cyl damage near the exhaust ports, it looks almost the same. Just that the mag side had not grenaded like the PTO side yet.
Top and bottom of the exhaust port has almost exactly the same marks. Here is a picture of the pto side that had the damaged top of the piston and head. The 2nd picture is of the mag side that has the same exact marks, but teh piston had not failed yet. You can see the mag piston has broken a piece off between the rings, so it was close.
What would be causing the marks on the ports? Any pointers?
Motor failed again early after the rebuild. PTO piston is destroyed. Piston top chewed up and so is the head and cyl. New cyl, head and piston on their way.
For prevention, I tore the mag side down also and it has issues also. in looking @ the cyl damage near the exhaust ports, it looks almost the same. Just that the mag side had not grenaded like the PTO side yet.
Top and bottom of the exhaust port has almost exactly the same marks. Here is a picture of the pto side that had the damaged top of the piston and head. The 2nd picture is of the mag side that has the same exact marks, but teh piston had not failed yet. You can see the mag piston has broken a piece off between the rings, so it was close.
What would be causing the marks on the ports? Any pointers?
