EFSM
Super OPE Member
- Local time
- 3:27 AM
- User ID
- 29079
- Joined
- Apr 30, 2024
- Messages
- 298
- Reaction score
- 636
- Location
- Extreme southern IL
A customer brought in a CS-620 Echo that wasn't running right. After changing the weird fuel that was in it, it ran very well, but made a strange knocking noise at idle. So I pulled the muffler to inspect. I'm not sure how much longer the rings would have taken this. I had ported this saw a couple of years ago, when the original crankshaft bearings failed and I stuck the piston and cylinder onto a CS-600 crankcase with the old mega-advancing coil. Should I be worried about the cause of this or chalk it up to very high hours?
EDIT: I realized in looking back at sales history on the 620 piston that I replaced this one last year due to a broken crown. This coil advances far enough for the saw to rev 500-700 rpm's more than a 620 coil. Is that part of the problem?
EDIT: I realized in looking back at sales history on the 620 piston that I replaced this one last year due to a broken crown. This coil advances far enough for the saw to rev 500-700 rpm's more than a 620 coil. Is that part of the problem?