2009 Fatbob

 

What makes this an upgrade?

 

My guess is that he meant to say "replacement" and used an incorrect word.

 

It is a replacement sealed bearing that AB made to match the original leaky bearing. It is sealed so there is no race. Press in with secondary seal and you will be leak free. I did my bike so long ago I forgot when. I was plagued with a trans leak due to an INDY shop that had no idea what they were doing except billing. It was after that when I made the time to work on my own bike. If there is a problem it is mine to fix and figure out. Recommend the bearing!

 

The all ***** 25-3103 is not a sealed unit, it is a replacement for the oem bearing.

That is why I questioned why it was called an upgrade.

http://www.allballsracing.com/25-3103.html

 

Look into the Jims 8960 Inner primary bearing upgrade kit. I used it in my 05 Softail Deluxe transmission rebuild last year. It's a standard sealed ball-bearing with its own inner race. Worked great. You still have to remove the stock inner race on the mainshaft with a special tool.

 

The OP`s transmission is a 6 speed, not sure anyone makes a one piece bearing kit for the OEM 6 speed.

 

This is pressed into the primary. The bearing kit needed has a sealed bearing as well as a secondary seal. The inner & outer sealed bearing is blue. It is a sealed roller bearing. I used it to stop the leak. I have a RevTech 6 speed. That is all I know about. It goes into my FXR inner.

 

Even if no one makes such a kit, you could bring your inner primary to a bearing distributor, and have them "mic" up the dimensions to fit your bearing housing and mainshaft. the inner race on a new sealed bearing replaces the mainahaft race. Get a seal from them and circlip and away you go. Unless you want some combination of keeping mainshaft race and a new upgrade kit ?? Don't know why you would.

 

For an 08 up IPB, you won't find a bearing from a supplier that will work.. For years HD has had problems with the inner race walking.. The early fix on race movement was to swap the roller bearing with a ball bearing where the race was part of the bearing so it didn't move in or out.. IIRC the early aluminum primaries had a ball in this location. All evos and TC use a roller and sleeve.. The sleeve on these can walk.. Typically they walk into the main drive gear.

The early fix was to use a 6205 bearing that had the center honed out 0.01mm or more to allow a slip fit on the mainshaft. You could press this bearing into the case and use a 25mm ID seal to seal the primary oil.. This works OK but I wouldn't use it on a higher HP motor. A ball bearing does not support the axial load of a straight roller. Also the fit in the inner primary can be tight enough to cause drag on the bearing. When this occurs the inner race spins on the shaft and wears both the bearing and shaft over time.. You can get the fit in the case just right and even allow for a slight press on the shaft and this will work fine. Done it in dry primaries but have added threaded holes in the case to pull the inner primary off.

I understand All ***** has a double row bearing fix but I've not used it..

On 08 up bearings HD finally added a small step in the mainshaft so that it can't walk inward (IIRC).. The 07 bikes simply had a tighter fitting bearing which could still have issues.

With the new clunk drive trannie the main shaft moves axially slightly as the gears are helical. Also the primary drive chain has been moved out some so there is more load on that bearing. I'd stick with the roller. Also make sure the use the latest seal as it is stepped slightly to allow the outer lip of the seal to run on the race.. I've had James seals not seal the end. Water got into the seal and rusted the race causing the inner lip on the seal to fail and the seal to leak.

FWIW Drag has a kit with the inner race, bearing and seal that seem to work well so far. It also has the correct inner seal.





As stated clunk drive (the factory 6 speed) bikes can eat this bearing.. Good bearing / shaft alignment and proper torque procedure (in SM) are critical here.