40YearHomelite
ArboristSite Member
I bought a DCS 6421 with the 84cc BB kit from Bailey's a little less than a year ago. I probably put about 10 hours on the 64cc and another 10 on the 84cc. I was recently bucking an old hickory when the saw suddenly lost compression and died. I gave a few pulls on the starter rope and the piston seized. F.
Now, when I say it seized, I mean it SEIZED. I had to strap the saw to a barn pole, strap a wench to another pole, and wench the cylinder off. This is what it looked like:
Apparently, the groove in the piston that holds the wrist pin circlip broke off, flinging bits of piston and circlip.
Thanks to Bailey's excellent customer service, I received a new BB kit free of charge. When I installed this one today, I made SURE to not gouge the piston, not strain the clip, and align the clip's gap at 12 o' clock.
While I was at it, I measured the squish at 0.051" with the metal base gasket for 150psi; 0.030" without the gasket for 165psi. I left the gasket off and sprayed on several layers of Permatex copper gasket compound. I re-tuned the carb and now the saw runs considerably stronger than it did last time with the gasket and lower compression.
Lesson learned: be careful with those dang circlips, align the gap at 6 or 12 o'clock, and go to Bailey's every chance I get![Rocker :rock: :rock:](/styles/default/xenforo/rock.gif)
EDIT: pics of the broken circlip groove
Now, when I say it seized, I mean it SEIZED. I had to strap the saw to a barn pole, strap a wench to another pole, and wench the cylinder off. This is what it looked like:
![NCMZ5.jpg](https://proxy.imagearchive.com/69c/69ccae7f35941e404e30ec955eb5fca7.jpg)
![PnELG.jpg](https://proxy.imagearchive.com/c79/c791b40b159c0c91d163ce26db3158c0.jpg)
![SWkBl.jpg](https://proxy.imagearchive.com/593/59371e0b1f84c14369fc4946df029bcf.jpg)
![ILg9J.jpg](https://proxy.imagearchive.com/d69/d690c93c91bcb6964434bd5d6bbacddb.jpg)
![OhUgX.jpg](https://proxy.imagearchive.com/de3/de3afcf68d7d9e49661bf92a4ebb5a9c.jpg)
Apparently, the groove in the piston that holds the wrist pin circlip broke off, flinging bits of piston and circlip.
Thanks to Bailey's excellent customer service, I received a new BB kit free of charge. When I installed this one today, I made SURE to not gouge the piston, not strain the clip, and align the clip's gap at 12 o' clock.
While I was at it, I measured the squish at 0.051" with the metal base gasket for 150psi; 0.030" without the gasket for 165psi. I left the gasket off and sprayed on several layers of Permatex copper gasket compound. I re-tuned the carb and now the saw runs considerably stronger than it did last time with the gasket and lower compression.
Lesson learned: be careful with those dang circlips, align the gap at 6 or 12 o'clock, and go to Bailey's every chance I get
![Rocker :rock: :rock:](/styles/default/xenforo/rock.gif)
EDIT: pics of the broken circlip groove
![ILjnd.jpg](https://proxy.imagearchive.com/346/346cf6978a3396c4950d043820798ae0.jpg)
![RG8bL.jpg](https://proxy.imagearchive.com/0d7/0d720ead336b12ccedf31be12e29d489.jpg)
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