HarleyTechTalk

Working on friend's 1990 FXRP.  Had to pull the rear pipe to access clutch cover.  Need to order an exhaust gasket but not totally sure which style to get.  She doesn't know the pipe mfr, all I know is they're straight pipes.   

Here's a pic of the pipe end.  Also attached a pic of what's left of the old gasket.   I think it's a square-style gasket  but wanted to be sure.  Thanks. 

You may want to take a close look at the Gasket.
Does it look like it's Beveled/Tapered around the Inside Round Edge?  Or Flat?

There are two different styles like mentioned above...
I believe that the year of that FXRP came with the Beveled/Tapered Style, but I could be wrong.
The Beveled/Tapered is HD Part #65324-88.
The Flat is HD Part #17048-98.
They usually come in Sets of 2 and are relatively in-expensive.

You may want to consider replacing both Exhaust Gaskets at this time seeing that You are in the neighborhood.

The distinction is generally that a tapered header pipe uses the tapered style gasket 65324-83B, most OEM pipes use these. And the square ended header pipe, most performance systems use the 17048-98 flat gasket.

It doen't matter which gasket you use .The tapered ones seem to seal better , but could interfere with the port when tighten down. The strait ones will eliminate the port interference but they could leak .

I like the Tapered Gaskets



and I'd replace the exhaust studs with the M8 studs

Part # 10900015A HD OEM

The exhaust on my two bikes have square ended header pipes, both have D&D systems. I run the Cometic C9247 on both, never have a leak.

IMO The Cometic gaskets (C9247) that Ohio HD mentioned are without a doubt the best option. I have used pretty well all of them and other than those that are special profile for the shape of the exhaust spigot they are the only ones that haven't intruded / "squished" into the exhaust port and are capable of causing turbulence and restriction.  When handled, the square faced gasket rings feel minimal in size and very stiff.  Again, when the gaskets are retorqued hot after the first heat cycle, they compress vary well and seal the pipe without pushing into the port reducing exhaust flow like the softer versions (like the Harley SE) that looks the same.

Performance build or not, you don't want this.

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For Cometic 68-9247 ex. gasskets, and similar types, I've made this tool for a non-distortion, trouble free installation.
John