Author Topic: Stihl 084  (Read 7643 times)

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Offline bowleggedgoat

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Re: Splitting 084
« Reply #101 on: February 09, 2014, 01:30:19 pm »
Thanks Cut4Fun, this is a huge help. Looks like the parts are majorly backordered, but I'm gonna try to get everything set up for when they arrive.

Offline mdavlee .

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Re: Splitting 084
« Reply #102 on: February 09, 2014, 02:02:04 pm »
I would be checking eBay and any other source for those parts also. A lot is NLA from

Offline bowleggedgoat

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Re: Splitting 084
« Reply #103 on: February 09, 2014, 04:36:42 pm »
is it possible to put an 090 top end on an 084 case?

Offline aclarke

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Re: Splitting 084
« Reply #104 on: February 09, 2014, 04:51:25 pm »
Takes a lot of Work, welding, cutting,Etc

Online jmester

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Stihl 084
« Reply #105 on: April 21, 2014, 10:11:56 pm »
Got an 084 in that was locked up. Pulled the front muffler cover found piston pieces and ring pieces. Only on the exhaust side. Trying to figure out what happen no seize marks. Bottom end bearings are good. A little play in the big end bearing but have seen worse.  The cylinder looks good and salvageable. No deep score marks. Could it be from over speed? Or just a faulty piston. Guy said it was rebuild not that long ago. And yes the piston was installed correctly.
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Online jmester

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Re: Stihl 084
« Reply #106 on: April 21, 2014, 10:15:26 pm »
Also noticed the coil is rubbing the flywheel. Read somewhere that you can gain some timing will a close coil gap. Kind of stumped.
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Online jmester

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Re: Stihl 084
« Reply #107 on: April 22, 2014, 07:04:01 am »
Going to go with the saw was running lean and over revved the motor. The extra heat made the rings stick. And the rings caught the bottom of the exhaust port and caused the piston failure. The plug color looks to be ok based on the color chart I looked at. Reddish brown to light grey. There is a chip in the cylinder at the bottom of the exhaust port. The beveled edge is gone. What do you guys think clean up the bottom of the exhaust port and rebevel or is it junk?
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Offline mdavlee .

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Re: Stihl 084
« Reply #108 on: April 22, 2014, 08:20:19 am »
Put a bevel on it and smooth it out best you can.

Offline Cut4fun .

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Re: Stihl 084
« Reply #109 on: April 22, 2014, 12:49:51 pm »
Was the piston a OEM or the cheap aftermarket ones out there for $25.  I had always wondered about the afm ones for the 084 088 etc.

Show me a pic of ring area to top crown and I can tell if oem or not.
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