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Well, I did a little research and I think I have a plausible explanation. FCW is Freudenberg and the attached datasheet shows seal color corresponding to seal material type. The blue is regular nitrile whereas the brown is a fluoropolymer. The fluoropolymer holds up much better to fuel and...

I think that you got this backwards. Take a closer look at the photos. These are the "hard" OEM seals that came from the factory.

Hello, Currently working on rebuilding an MS251. I have 2 engine assemblies and am going to make one good one. I noticed that the oil seals appear to be a different color from the FW and PTO side. This makes me wonder if they are different materials. The PTO side is brown while the FW side is...

I like that shopping basket idea for holding parts while spraying!

This looks to be something new. The old Gunk Engine Brite was just kerosene in a spray can!

This and any lye/caustic cleaners work REALLY well on organic crud like tree/pine sap. I was taking down a hickory tree and the chain got all gunked up. Kerosene wouldn't touch it so in desperation I put it in an old can with simple green in a double boiler on the stove. It cleaned that chain up...

Yes, diesel has a non-hazardous (non-explosive) designation. So if you save a couple or 3 gallons of used diesel what do you do the next time that you need it? it is now full of dirt and sawdust from previous uses. Do you siphon the good stuff off of the top into another bucket? If you dunk...

I don't have any place to do this. Small house and small garage. I think that the neighbors would object if I put it on the front porch!

I am currently using diesel but not in dipping quantities. Just slathering it on with a brush. The real issue is what do you do with the diesel between uses or dispose of it after you are done. I am currently recycling small quantities of it with used motor oil. I live in a subdivision where...

If either of the attached MSDS sheets is the product that you are referring to it appears to be a water based caustic de-greaser like Simple Green and a bunch of others. Seems like it would take a lot of de-greaser to cut through all of that bar oil.

Hello, I am looking for ideas on the most efficient ways to clean up something like what is pictured below. I also don't have access to a parts washer. I do have a power washer but that can damage plastic and the spray force can blow the object being cleaned across the driveway. Any...

Thanks, I was planning on a re-tune. I haven't torn into the saw yet so don't know how choked up the muffler is. The only reference that I have to go by is for a non-EPA 025 (same displacement) which had a pretty large outlet.

Hello, I am wondering if a muffler mod is advised (or not) on strato-saws? I am mostly interested in improving operating margin i.e. making the saw run cooler as happens with non-strato engines. Has anyone done any testing on this? I know that strato charging is supposed to increase scavenging...

The remaining photos...

I finally got some cooler weather and mostly time to tear into this engine. The main issue found was that the exhaust valve was crusted with hard carbon and leaking like a sieve. The exhaust passages behind the valve and to the muffler were also caked in fairly soft carbon. The inside of the...

The guard is there to cut the line to keep from overloading the engine. I did put a speed feed on one of the trimmers that I rebuilt. However, for a non-profit trail club replacing otherwise working equipment is not economically viable. BTW, the volunteer end user doesn't know any better :-) ...

Here is a thread from the guy that developed the Stihl tester: https://www.masterblasterhome.com/threads/leak-down-gauge-search.23384/ It sounds like they modified their version to test at lower pressures to avoid blowing out crankcase seals if used on sealed engines. They may have also done...

So where did you find the calibrated 1mm orifice or did you make it? Also, how do you read the leak % from the psi gauge? I did find out that the Stihl tester (5910-850-0300) is made by Thexton. I looked in their catalog but didn't see anything similar so it must be a private contract. There is...

Yes, a regulator, 2-calibrated gauges separated by a calibrated orifice. It is interesting that Stihl removes the inlet side pressure numbers from their gauge so that you don't really know what pressure you are testing at. I am also wondering if they have changed the "standard" .040" diameter...

Any idea who makes this for Stihl?