Rear Sprocket Bolts - Check - Retorque

supertireguy · Oct 12, 2005

For some reason the rear sprocket bolts sometimes slowly loosen over time with regular use. One friend with a KTM (same rear sprocket/bolt carrier as the HSB) did not pay attention to this and his bolts came loose causing some damage.

Take a minute to inspect and retorque these bolts at your next opportunity. You might just find some of them have come loose.

muckybill · Oct 12, 2005

Have you re used them.
They should be replaced every time you change sprocket.

Bill

supertireguy · Oct 12, 2005

Not sure how many times my KTM friend reused his sprocket bolts but I would suspect it was more than twice. He is basically a slacker when it comes to bike maintenance.

I would agree it's probably best to install new rear sprocket bolts when installing a new sprocket or after 100 hours of use.

In the meantime it would be a good idea to take a minute to inspect and retorque your sprocket bolts.

Parsko · Oct 12, 2005

I had a similar problem on my '03. Last ride I went on, as we were packing the bikes on the truck, I noticed 4 of 6 bolts were loose. When the sprockets are taking the constant positive and negative torques, it will slowly start to move the sprocket back and forth.

-Parsko

t-jet-tim · Oct 12, 2005

I found one loose sprocket bolt so I pulled them
all and used the blue loctite on them. Never had
a problem after that.

2005FC550 · Oct 16, 2005

Yes, I definitely agree to Loctite 242 (removable thread strength) or equivalent. I have seen sprocket bolts come loose and destroy rear hubs on all types of bikes. When to change sprocket bolts? Being a high strength bolt KTM/Husaberg (not cheap Japanese), they should last a life time. I have been using the same bolts on my spare wheel for four years and numerous sprocket changes.

SFO · Oct 17, 2005

The big countersink head is a torque sink.
This is where the blue LT belongs, on the taper interface.
Once the hub has oblonged slots you are living on borrowed time.
Linkless suspensions require the proper chain tension as well.
This will magnify the stresses imparted at the hub bolt juncture.
I saw KTM factory bikes at nationals with too tight chains.
Of course I told them...

JJW501 · Oct 17, 2005

i'm a radiographer. whenever someone comes in who has come off a bike, i always have a yarn to 'em and ask what happened(assuming they are conscious!!). sometimes they say they hit a tree while riding a CR500, sometimes a 'roo knocked 'em off.

Twice i have done trauma series on riders after rear wheel collapsed, from the rear sprocket tearing loose after bolts are missing.

take care. it really isn't worth getting busted up over.

Have Fun
Jeff

SFO · Oct 18, 2005

one more thing, torque the nut, not the bolt 8)

nsman · Oct 18, 2005

SFO said:
one more thing, torque the nut, not the bolt 8)

It is a common error that people tighten the allan head tapered sprocket bolt while holding the nut when as SFO says it should be done by holding the bolt and tightening the nut.The reason for this is of course that the taper on the bolt and the reverse taper on the sprocket adds greatly in the ability of the bolt and nut to stay tight.Similar to a flywheel,the fit on tapered shaft is really the holding power, not the key and keyway.

Bluto · Oct 19, 2005

The blue loctite mentioned before is #243,not 242...
Not trying to be a wise ***,but just correcting.

2005FC550 · Oct 19, 2005

Yea wise ***

:twisted: just kiddin . You can use either, make sure it is "removable". They will both work. Goto site: Loctite and type in search box: 242 or 243.

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Rear Sprocket Bolts - Check - Retorque

supertireguy

muckybill

supertireguy

Parsko

t-jet-tim

2005FC550

SFO

JJW501

SFO

nsman

Bluto

2005FC550

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