!988 XR250 rear shock rebuild

[yfcheung]

I don't know about repair limits or anything, but I know that a new
outer shock body for an 88 XR 250 cost me $76 last summer, plus another $65
to have it hard anodized.............

Farmer John
RF900//CR250

Peter Lambert wrote in message <3984FD73...@elec.canterbury.ac.nz>...
>I have just dismantled my XR shock to give it its first oil change .
>Yes it has been a while.
>On inspection I have found the body to be .3mm worn over the standard
>40mm size.
>While I am perpared to live with this, I am a machinist able to do
>repairs.So I reckon I should .
>I am at this stage developing a solution which will probably involve
>machining the body to accept an aluminium sleeve with a hard anodised
>bore. This sleeve will be aproximately .5mm wall thickness and will be
>Loctited in the shock body.
>Does anyone have any experience with shock repair in this respect. I am
>also interested in shock wear limits.
>I am interested to hear any comments.
>Thanks in advance
>Pete
>

[Peter Lambert]

[Hoyt McKagen]

Peter Lambert wrote:
> Does anyone have any experience with shock repair in this respect. I am
> also interested in shock wear limits.

Peter:

I've made dampers complete and fixed them too. The best way isn't to
sleeve it, it's to hone the body true and make a new piston, or if this
is one with a wide, flat 'ring', to make a new ring with the clearance
taken up. You'll make a ring anyway so be advised that the end gap is
largely what determines your damping efficiency. When I make bushings or
rings for dampers, I allow extra circumference by the amount of the
slitting blade plus a hair for fitting up. I'd also use bearing bronze
over any amd all other materials for piston and ring too.

Regards,

Hoyt McKagen

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