swing arm spindle....how tight

MikeG · Dec 21, 2022

I installed new swing arm bushes tonight, used this arbor:

Bushings slid in with little effort. Before installation the new pin slid through the bushings easily. Since install the pin pushes in hard, still by hand but hard, and I can put a 3/4 inch wrench on the milled flats on the pin and spin it. If I try and take the pin out it requires light drifting. I know the bushings ID shrank a bit from the install, just wondering if it needs a .0005 or so removed with a reamer? Or as Mr Granger used to say "They'll ride up with wear".

Tornado · Dec 21, 2022

I think a wee soak in the 140wt oil lube is in order. The bushes are meant to soak it in as they are porous. Would not worry is snug but rotatable fit. Swing arm plus wheel sould easily overcome resistance.

marshg246 · Dec 21, 2022

If the swingarm will fall (no shocks) by its own weight and the pin doesn't turn; IMHO, you are OK. You could lightly sand the inside of the bushings, but they are oil impregnated and it's really hard to get rid of the metal you sand (or ream) off.

MikeG · Dec 21, 2022

I did soak them in 80/85/140oil for a few days. I thought about making a guick pass with a wheel cylinder hone but afraid of embedding grit in the bushing

kommando · Dec 21, 2022

Leave as is, the drag from the bushes is miniscule compared to the forces on the wheel on the end of the swingarm. Getting grit embedded in the bushes will wear out the pin, using a reamer risks smearing the surface of the bush and blocking the pores.

Onder · Dec 22, 2022

I agree. Stay away from sanding. The wheel assembly weighs a ton and think of this mass bouncing about at 60mph. Things will
wear in right sharpish! I replenish my 140wt once a year (as in now) and it leaks out until it is gone. Trust that enough is held inside the bush material for sufficient lubrication.

concours · Dec 22, 2022

MikeG said:
I installed new swing arm bushes tonight, used this arbor:
View attachment 102231
Bushings slid in with little effort. Before installation the new pin slid through the bushings easily. Since install the pin pushes in hard, still by hand but hard, and I can put a 3/4 inch wrench on the milled flats on the pin and spin it. If I try and take the pin out it requires light drifting. I know the bushings ID shrank a bit from the install, just wondering if it needs a .0005 or so removed with a reamer? Or as Mr Granger used to say "They'll ride up with wear".

No.

BERT · Dec 22, 2022

I would leave it IF you have rotation between the bushes and the pin and NOT the bushes and the swing arm.

MikeG · Dec 22, 2022

Issue solved, or at least identified! It's not the bushings, its the pin. In particular one spot on the first 1/4 inch or so of one end. Pin slides in easily from the other side but takes considerable pressure on this side. Been working on it with ultra fine crocus cloth and its a bit better. I would not worry so much but I'm afraid if I don't it will make lining up the bolt hole a horror show as I'm doing it with the primary still in place.

milfordite · Dec 25, 2022

If it's the pin, I would keep on it until you're satisfied that you can position it correctly.

MikeG · Dec 25, 2022

Pin in all well. Swing arm moves up and down with light hand pressure. Will fall by itself with brake assembly on. I'm calling it a done job.

swing arm spindle....how tight

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