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post #1 of 4 (permalink) Old 07-17-2014, 08:22 AM Thread Starter
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primary seals

While I had the bike up on the lift for other things last weekend I noticed there's an oil leak from behind the inner primary and blowing back onto the cross under pipe. I do my own work on the bike so I'll take it apart this weekend but my question is, does anyone make an all in one seal/gasket KIT for the primary or do I have to go to HD and buy everything separate? While I have it apart I'll replace the inner bearing too so I don't have to open it back up when it decides to go. Thanks

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post #2 of 4 (permalink) Old 07-17-2014, 08:43 AM
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That is usually the shifter shaft seal and I had happen to two of my bikes both around 50K miles. What I found on both was that the needle bearing inside the primary had started coming apart ruining the shifter shaft seal. This is one job I take to a buddy to fix as he pulls the tranny and replaces everything that needs to be replaced.

When my Dyna did it I took to another friend first who only replaced the seal without pulling the tranny and it started to leak again in about 10K miles. This is a do it right the first time kind of thing. Pricey but worth it.
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post #3 of 4 (permalink) Old 07-17-2014, 10:59 AM Thread Starter
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I know what you're talking about as my buddy did the actual shift shaft itself when his shift lever striped the shaft. With that said I'm pretty sure it's the seal on the back of the primary. I can't tell 100% cuz i cant stick my big head under the bike to see but I did use a mirror to look back there and the only thing that is wet with oil is the back of the primary. The shift shaft seal looks dry and the belt sprocket and tranny looks dry as well. I should have time this weekend to start digging in and I hope the tranny doesn't have to come out

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post #4 of 4 (permalink) Old 07-18-2014, 12:10 AM Thread Starter
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Well I was able to get the primary off tonight after work. Not to pat myself on the back or anything but my diagnosis of the inner bearing seal was correct. I'm just glad it wasn't anything more. Everything else behind there is dry as a bone. The inner bearing and race looked very good and felt nice and smooth and there wasn't any play in the shaft so I decided to leave them alone. I would've been able to finish everything tonight but I don't have a torque wrench for the SE compensator (which has some wear on it but will leave it til something better comes along) and the clutch housing so I'll button everything up in the morning. Here's what the back side of the primary looked like

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