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Please see the attached pics.

I started the process of removing the air filter assembly in order to add / modify / route a new crankcase breather hose downward and under the bike (21 Chieftain w/factory 116). Reason being; I'd like to keep my paper filter element completely free of oil residue (which isn't much).

After removing the the air box cover (14) and filter (12) I removed the three T25 Torx screws holding on the air filter retainer plate (10). Problem is, I have been unable to remove the retainer plate due to the retainer plate seal (11) which sits behind a lip on the throttle body. No matter how I twist or how much pressure I put on it the seal won't come over that lip, and of course I don't want to exert too much force for fear of breaking something or having to replace the seal which is a $22 part if I could even get one.

So . . . any advice on how to remove that retainer plate without damaging the seal. Unless I can get this off I can't get to the breather hose. Any help would be appreciated.

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Please see the attached pics.

I started the process of removing the air filter assembly in order to add / modify / route a new crankcase breather hose downward and under the bike (21 Chieftain w/factory 116). Reason being; I'd like to keep my paper filter element completely free of oil residue (which isn't much).

After removing the the air box cover (14) and filter (12) I removed the three T25 Torx screws holding on the air filter retainer plate (10). Problem is, I have been unable to remove the retainer plate due to the retainer plate seal (11) which sits behind a lip on the throttle body. No matter how I twist or how much pressure I put on it the seal won't come over that lip, and of course I don't want to exert too much force for fear of breaking something or having to replace the seal which is a $22 part if I could even get one.

So . . . any advice on how to remove that retainer plate without damaging the seal. Unless I can get this off I can't get to the breather hose. Any help would be appreciated.

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Find the service manual. Plenty of them floating around on the internet you can download free. It should tell you how.

Edit: looking at older service manuals, I don't see it show how to disassemble. Just that diagram. You aren't meant to take that apart. Seems like it would be pretty easy though...

Edit: I found it. The manual does show how to remove this. It shows the 3 screws you pointed at, then says to simply remove that black plate... you should be able to just pull it off. Then, you can detach that throttle body.

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'17 Springfield, '20 Chieftain
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Apply a little oil on the lip of the throttle body. Also remember that the vent hose is attached to the back of the adapter plate, and it's providing some resistance too.
 

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I recently took the air cleaner assembly off of my Chief. Agree with others - use a little oil on the throttle body lip (or directly on the rubber seal) AFTER you make sure all the screws are removed. That plate is really hard to get off. I got it to come off by twisting it while pulling it towards me. Be careful and don’t hit yourself in the face when it lets go.
 
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