Are Stihl Flippy Caps Supposed to Squeak and Leak?

[chipper1]

 

[PapaWhitebeard]

According to the Stihl IPL for my MS361, 25x3.5mm (Stihl part number for the o-ring alone is 9645 948 7734).

Lots of o-rings with those dimensions on ebay.

FYI the 25mm is ID (if you're looking for o-rings they usually want either ID or OD or both) "Inner Diameter" and "Outer Diameter" ID / OD

Best

 

[Chevboy0167]

Funny thing on the Husqy fuel cap that came on my brand new 562, I noticed 2 threads stripped off. Mind you, this saw never had been fueled except possibly from factory run test? It sure never smelled like it tho. 2021 model year by the way.

$7 for a new one and I have the original as a backup cuz it never leaked. Chock it up to factory defect maybe? I dunno....