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Brake drum turning

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An early consideration is to determine how deep these grooves
are and the amount of material necessary to be removed to restore
or true the swept surface of the drum.

 

There is a maximum ID for the drum.  If a clean-up on yours is bound
to result in opening the diameter to or beyond the service limit, then
there is a repair/replace decision to be made regarding the hub.

 

A possible option for salvaging a drum that is scored so deep that a
clean-up will leave it oversize is to have a set of brake shoes relined
with thicker material.  However, this adds further expense on top of
turning the drum.  Moreover, future brake work will again require
custom shoes and the 'arcing' recommended to fit them to the drum.

 

A quick check indicates that #42601-KK0-010 Hub, Rr Wheel is
common to XR200 & XR250 from '84 to '96 and again in '02.  This
suggests that locating a good used replacement rear wheel or just
the hub alone for a reasonable price is a pretty good prospect.
The hub continues to be available from Honda, but price for a new
one approaches $400.

 

Regarding turning a drum.  My experience is with automotive drums
which are conventionally removed from the vehicle and turned on
a purpose-built brake lathe.  There may be or have been a similar
machine for servicing motorcycle drums - I do not know.

 

De-lacing the hub and fixturing this in a metal turning lathe is
conceivable.  However, a possible consideration may be the effect
that re-lacing the hub has on concentricity - it is not improbable
that spoke tension might distort the shape of the drum.  Again,
I have no experience to say what happens in actual practice.

 

A lathe with a large enough 'swing' could accept the entire wheel
assembly.  (Truing the wheel before turning instead of afterward
would contribute to optimum drum concentricity.)

 

Another method appears to utilize a tool that grinds the drum ID
while the hub/wheel are assembled.  I have seen an advert in bike
magazines and a quick check brings up a link to service offered
by RaceTech. 

 

   http://www.racetech.com/HTML_FILES/BrakeArcing.html

 

Incidently, 'arcing' is the process of fitting the shoe(s) OD to the
finshed ID of the drum - properly done, this facilitates smooth
progressive engagement, rather than on-off grabbing.

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All Pro link XR200R rear wheels from 84-02 will fit and have 17" rims,

84-89 XR250R hubs also the same except 86-89 have 18" rim vs 17".

For 84-02 XR200R the brake shoes are the same front and rear, and used on a ton of other Honda models.

 

Some rear rims are offset relative to the center of the hub, don't know if any of the XRs are that way. But if you end up needing to unlace a rim check its alignment relative to the hub before unlacing.

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I typically start by using #60 grit sand paper and shoot for the hills and turn into quarter turns by hand until I feel it is ready for #100 grit.

 

This is very time consuming and tedious process, so be prepared to spend some time on the project. 

 

If you feel you are beyond the spec of the drum, consider buying a used unit that is in better shape and start from there. 

 

Just my .02¢ worth. 

 

Michael 

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