I drilled a 37/64 hole in the top of my primary, tapped it with a 5/8-18 tap and installed a chrome EVO timing plug pn#94138-93T. Now I don't have to take off the derby cover to fill the primary and if I do take off the derby cover for a clutch adjustment, it is still easier to fill the primary through this hole. Now before anybody says you need to see the bottom of the clutch basket to see that the fluid touches the bottom of it, once you fill it a couple of times and each time it takes the same amount it ain't gonna shrink or expand and change the amount on you. I contemplated using a crush washer, but I thought about it and the top of the primary only gets splashed as the chain goes around, it doesn't have constant fluid resting on it. Therefore, I thought a little thread sealant and I'd be good to go. Here's a couple of finished pics.

[IMG]local://upfiles/13641/99F8E97886354E3A9443A115DD5F0764.jpg[/IMG]

[IMG]local://upfiles/13641/DE3D24BC0ED04E138CF8C479A27BEA75.jpg[/IMG]

 

I usually measure mine out, but this idea still beats filling from the side. Nice..

 

Dawg, what did you do to keep the metal shavings out of the primary when you drilled and tapped the hole?

 

Dawg, you sure you know what you're doin'. This isn't you first Harley eh!

 

Well I should've done it while the cover was off, but I didn't want to take it off all over again so I used a vac and sucked the shavings as I drilled and tapped. I'm gonna dump and change the fluid also.

 

Dawg, you tryin to take my job??? Just kidding great mod!

 

I like it! Thats a great idea.

 

You realize this is probably going to void your warranty.

 

You're a rip.

You know there's medication for OCD.

My buddy's father used to always tell me, "thank god you're not a bridge painter", I think he would've said this about you as well. Always steppin back to admire your work!

...lol

 

I am very impressed that you actually had the ***** to do that. Personally I do not especially on a new bike. I just don't see the need to do it at all. I always do a clutch adjustment anyway when I change the fluid, but to each his own.