I have a 05 1200 custom with only 550 miles on it. Just changed engine oil on it with Mobil 1 20w-50 synthetic. Did not get ownwers manual with bike but with help fromanother internet site was able to change with no trouble. My question is how do you change the primary oil and what kind of oil works best? I know where the drain plug is and read a thread saying the primary/tranny takes 1 quart. Any help or step by step would be greatly appreciated. Thanks

 

many people drain it out completely and then using exactly one quart refill through the inspection cover.

 

Where is the drain plug for the tranie on a 2004 883 Custom?

 

on the bottom left side of the motor under the primary cover there will be two bolts the one in front is a stud with a nut used to adujst your primary chain the second one back will be below the primary cover is the drain plug.the drain plug has a magnet on it to collect metal shareds that could cause a problem. I use h-d syn3 in both the motor and primary .oh yeah buy the manual its cheaper than one oil change.

 

be very careful and dont overtighten , i thought i stripped something a couple of weeks ago because i felt something give when i thought i would tighten it just one more quarter turn , turns out i just demolished the o ring

 

You can use the same Mobil 1 20-50 in the primary/tranny if you want OR better yet Mobil 1 75w-90 Syn Gear Oil. Either are way better than HD oils. Takes exactly 1 quart, fill through the chain inspection cover on left side, 2 screws.

 

If you pick up the service manual from a HD dealer or through a website you will have all the information you need to do your own services.I got mine from J&P

 

Hey Rock,
Try this thread for a PDF service manual: https://www.hdforums.com/m_1652892/tm.htm If you download it, chapter 3 has all the info you need!

 

I think highly of the Ford Motorcraft 75w90 Synthetic gear dope....my transmission quit whining when I put that stuff in.....=-)

Rev. George.....Chattanooga, Tn

 

Thanks for the help. I think I will use the 20w-50 since I have an extra quart.