SAE 90 vs 140 for swing arm spindle

zotz said:

I just remove the pin retaining bolt on the top of the swing arm and pump oil in through the fitting until it comes out the top. No chance for a pressure build up.

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I do the same, but of course, there is absolutely no need for it to be full!

There are two small holes that feed the bushings and some oil in the original setup can get to the end of the bushings through the ends of the spindle but that will all happen with the spindle way less than full. The newer setup is supposed to be permanent but just a little in the spindle will keep the felts soaked.

It does "feel like" a good idea for the spindle to be full and the guys making things to keep feeding it "feels" even better. However, if it leaks, the more you put in the more that leaks out!

This little oil thread is starting to gain TRACTION!!

marshg246 said:

8) If the spindle bore in the cradle is wallowed out and the swingarm can twist in the cradle, it's only a matter of time before the o-Rings or new-style seals will be worn and leak. I'm not a fan of Kegler clamps "just because", but in the absence of a good cradle, I install them using parts from McMaster-Carr.

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I honestly couldn't see the harm in bolstering the spindle bore holding capability of the cradle by installing Kegler clamps. The replacement spindle is already machined to accommodate the MK3 swing arm cotter pins which makes a perfect place for Kegler clamps to be utilized. Seems like using only one 1/4" bolt (as in the MK1 and MK2 does) to hold the spindle in place, might very well be the reason a spindle bore allows movement of the spindle causing the wear.

Jonez69 said:

I honestly couldn't see the harm in bolstering the spindle bore holding capability of the cradle by installing Kegler clamps. The replacement spindle is already machined to accommodate the MK3 swing arm cotter pins which makes a perfect place for Kegler clamps to be utilized. Seems like using only one 1/4" bolt (as in the MK1 and MK2 does) to hold the spindle in place, might very well be the reason a spindle bore allows movement of the spindle causing the wear.

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It's not harm, it's the PITA factor. It's the kind of job that drives a perfectionist up a wall. And, if you don't get the holes in the same plane side-to-side you can likely damaging more than you are fixing. I had two cradles I bought where someone "threw on" the clamps and turned the cradles into junk. I also had one where a new spindle was not used and by the time I got the spindle out with the dents from then clamps and from the bolts pressing on the spindle, the cradle went to the recycle bin.