Picked up a CCR3650 for $40 that a dealer tossed in the towel on. It's a 2003 model 38518 and has the R-Tec 141cc engine. The externals were ok and the engine not frozen so picked up as a possible resurrection or worse case a parts machine. After taking it apart and looking it over it seemed it would cleanup fine so the only issue was the engine.
It had spark but would not start and the compression very. The electric start gear was stripped but the flywheel teeth ok
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Took out the engine that seemed very small. Hard to believe it’s 6.5hp. It looks like it should go on a model airplane. Opened the engine and to my surprise the crank was on roller bearings. Odd was there is no part number for the bearings. The crank is sold as an assembly with bearings.
Opened up the engine and found the piston in pretty bad shape, with heavy scoring from top to bottom, especially the bottom which is very bad.
On one side the rings are stuck solidly in their slots and the wear such that the rings can’t be distinguished from the piston body. The bore above the ports has lines but seems smooth. I can’t catch a fingernail but can just barely feel them and guessing a few might be .0005 or less.
Below the ports is another story. There’s deep lines and rough places. The question is what are the chances of success with a rebuild? The piston top will ride down to the top edge of the ports where the bore is in ok shape. I think the piston would probably go down to where the bottom ring is just above the port.
The bottom of the piston skit would be at the same level as the bad scoring on the bore. The bottom bore scoring will probably rip up a new piston skirt quickly. Can that be lived with or will damage to the skirt cause problems?
Another question is has anyone put in a different engine into one of these bodies (38518)?
This message was modified Dec 30, 2011 by trouts2
