Derby Cover Gasket
Thread Starter
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Novice
Joined: Apr 2017
Posts: 15
Likes: 0
From: Lafayette, IN
Derby Cover Gasket
I got a new derby cover. Black for my new black primary cover.
The derby cover Part Number 25700388 fits fine I reused my gasket which is the orange ring style. But I'm getting a leak around the derby cover.
I assume I need the pancake style. So I bought one on amazon but it doesn't fit the 5 holes. It fits the old derby cover and primary cover but the new one is just a little larger.
Anyone know what gasket I need to get?
The derby cover Part Number 25700388 fits fine I reused my gasket which is the orange ring style. But I'm getting a leak around the derby cover.
I assume I need the pancake style. So I bought one on amazon but it doesn't fit the 5 holes. It fits the old derby cover and primary cover but the new one is just a little larger.
Anyone know what gasket I need to get?
Road Master
Joined: Jul 2016
Posts: 1,080
Likes: 103
From: Lake County, CA
Don't know what year your bike is.
On my 15 RGS it has an orange O-ring. When I exchanged my Derby Cover I had to dry it off pretty good in order to stay in the cover. Once that was done I didn't have any leaks.
When it has been on and leaks, I would dry everything off to allow the gasket to adhere to it.
Good luck
On my 15 RGS it has an orange O-ring. When I exchanged my Derby Cover I had to dry it off pretty good in order to stay in the cover. Once that was done I didn't have any leaks.
When it has been on and leaks, I would dry everything off to allow the gasket to adhere to it.
Good luck
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,741
Likes: 1,599
From: Danbury CT
If there is a groove on the back of the derby cover you need the o ring. If it's flat you need to paper style pancake 5-hole gasket. You may have gotten the wrong gasket or a poor copy off of Amazon too.
Last edited by golfblues; Apr 22, 2017 at 07:04 PM.
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,741
Likes: 1,599
From: Danbury CT
If there is a Groove then you need the O-ring not the paper gasket. Try putting some oil on the O-ring or Vaseline and it'll stick in the groove better and seal any leaks. Again if it's not an oem it could be a different diameter or a poor copy.
Outstanding HDF Member
Joined: May 2015
Posts: 2,172
Likes: 377
From: Georgia
If the cover has a groove for the orange rubber gasket you must be sure the groove, rubber gasket and primary surface are very clean and dry. Take your time seating the gasket into the groove until it will stay on its own. Tighten the screws down in a star pattern. I do it in two steps. First to just snug then evenly tight using a torque wrench. I don't remember the torque numbers but its not much, inch pounds as opposed to foot pounds.
Thread Starter
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Novice
Joined: Apr 2017
Posts: 15
Likes: 0
From: Lafayette, IN
I reused the OEM one that was on the old derby cover. I will try to but it back on.
The derby cover is a HD OEM slim line cover.
The derby cover is a HD OEM slim line cover.
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Road Warrior
Joined: May 2012
Posts: 1,570
Likes: 117
From: Southeast NC
make sure you wipe off excess oil off inside derby cover and on the primary too. dont over tighten the torx screws. i think its only like 19 inch lbs or something. if you have a grove in derby cover and u use the rubber gasket that comes stock from original derby cover, you shouldn't have a leak.
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Joe Kucinski
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,741
Likes: 1,599
From: Danbury CT
His derby cover is designed for the O-ring.. The pancake gasket won't work with his cover.