Rear axle nut torque

[Justyntym]

Chain tightening today...I've got my trusty torque wrench set for 72.5 lbs, slightly tighten and increase pressure and the familiar torque wrench "pop" lets me know I'm there.

I look down to reinstall cotter pin and I'm spaced in the middle. Hmmm...guess crank it a tad tighter to line up the holes.

After linning up the holes I decide to measure torque...it's over 90lbs. (Haven't tried a hundred yet).

Well the 72.5 ft lbs seems pretty darn specific in the manual and the last thing I want to f up on the busa is something in the rear end. What happens to all the bearing if overtorqued, is this a big no-no or just keep undoing it and rethreading it till I get closer??

 

[runeight]

oh man..don't go tighter. Should be enough room to cotter pin it.

hogger...

 

[Justyntym]

I didn't like that 90+ lb feeling so I backed it back off and retorqued it. Heard the "pop" at 72.5lbs and it was dead on over the cotter pin hole.

 

[Charlesbusa]

Remember there are 2 different holes you can slide the cotter pin into.

 

[runeight]

I didn't like that 90+ lb feeling so I backed it back off and retorqued it. Heard the "pop" at 72.5lbs and it was dead on over the cotter pin hole.  

I can now sleep tonight.

hogger...

 

[MFFJM2]

What size cotter pin should be used..? I tried measuring the old one and it looks like it's about 3/16 by 1 1/2 inches. The manual says to never reuse a cotter pin. Well, I don't have a box of the things sitting around, but if I knew the actual size I could order some. Anyone know..?

 

[Don Hardcastle]

Justntym,
I had the same problem. Mine was just a little misaligned. I tightened just a tad more and lined up the holes. Measured it and it was at about 78. I decided that was probably ok, if the tolerances were closer than 5.5 ftlbs there would be a lot more problems with these bikes.

400 miles later and no probs.

Don

 

[Aquaman]

The manual says to never reuse a cotter pin. [/QUOTE]
The manual is full of crap...
I reuse mine and never have a problem.



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[Revlis]

Better to back off a tad to line up the cotter pin than to Over torque the nut to line up the hole.

 

[Revlis]

As for the Manual Being full of crap? Fug me Whatever, it's a .50 cent part.

How about just replacing the damn thing and knowing your doing it right, as apposed to Backyard Engineering it and have a fatigued .50 cent part let you down out in the middle of BFE???

Yeah the manual is written by the Lawyers, but it's still not a bad idea...

 

[BusaWhipped]

In a pinch, I'll use a cotter pin twice. Just never bend over the same leg more than once. I prefer to replace every time.

 

[TIMMYDUCK]

With a aftermarket 27 cent Ace Hardware reusable Cotter Pin Pull System, you should be able to obtain the 72.5 lbs desired.



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[TIMMYDUCK]

2nd shot.

 

[DaCol.]

Better to back off a tad to line up the cotter pin than to Over torque the nut to line up the hole.

+1

 

[MN72Busa]

72.5

I thought the manual called for 100Nm, or equally converted 50 Ft Lbs per OEM torque specs.

I run CZ wheels, and was instructed to run only 50% of OEM Torque Specs, so I run 50Nm front & Rear with no issues at all. 72.5 Ft Lbs sounds like a heck of a lot of torque....I havent looked at the manual for a few months, but 72.5 Ft Lbs doesn't sound right, but correct me if I'm wrong.

 

[7th Gear]

How about just replacing the damn thing and knowing your doing it right, as apposed to Backyard Engineering it and have a fatigued .50 cent part let you down out in the middle of BFE???

I travel through BFE all the time.

 

[Relsek]

If you have trouble with the pin, just put a nail in the hole with the head up, gravity will hold it in.














maybe

 

[MN72Busa]

Torqued to 50 Nm

 

[Justyntym]

72.5 ft lbs is correct.

(100Nm/72.5 ft lbs)

I'll tell you what, when I tightened my chain the first time...I almost busted a nut trying to get the axle loose...it was a lot more than 72.5...I almost couldn't do it with everything I had, it was seriously tight.



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[MN72Busa]

Ok, just looked in the Manual, and it says 100 Nm, so I guess that is 72.5 / 75 Ft Lbs of Torque. I'm not sure what I was thinking Since I torque mine to 50 Nm, or 35 Ft Lbs (Non-OEM spec's per CZ instruction) - my fault...Duh, Guess I will just go back to being sick & reading.

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