Uni filter surprise

[open1mind]

I was surprised to see that a "UNI" filter was installed in the stock airbox of my bike. Forgot that they even made these things, and I recall them from cycle mag ads from years ago. I mention it because a) it was a surprise to see it lurking in there, b) I am pretty sure that the prior owner had stock in Exxon because he had so much oil on the filter element. No, it is not motor oil.

I am wondering now if the carbs were left stock, given that the exhaust is 100% stock. Always had a mild flat spot at about 2K-3500 rpm, so the filter might be a small contributor there.

[Nessism]

The majority of GS bikes come from Suzuki with oil foam air filters (aka Uni type). You have a chain drive 1000? That's one model that came with a paper filter.

[850 Combat]

One of my 850 Commandos has big Mikunis on it, and you can't fit the normal filter. It has had Uni pods on it for the 35 years it has been in my family. About 10 years ago I replaced them because the foam had gone crumbly. The flexible nature maked them gandy, as they conform into the space available.

[open1mind]

Mine is a chain drive one, and came stock from the factory with the paper filter. I am switching it back to stock to avoid any ambiguity or issues with mixture, idle, etc. Since it has the stock exhaust, I doubt if I was gaining anything,