Early Sport fork seals

[gstallons]

Not a change but more of a transition .

[docc]

11 hours ago, Pressureangle said:

A half-hour of web search turned up zero DU bushings in 43mm. Closest I can find is 45mm- but they are cheap. 

https://www.hydraulicszone.com/mdu-045x050x012.html

You might consider sourcing them from the WP service center, if they're not prohibitively expensive.

Pyramid parts ships to US, which is about $70 US if it's the same as things going the other direction. 

https://pyramid-parts.com/collections/fork-bushes

I'd suggest that 43mm is simply outside the industrial standards, and fork manufacturers have them made in quantity to suit. If that's the case, your sourcing is limited to motorcycle fork suppliers. <shrug> Doable, but again considering the price and convenience (less for you than me) I gave mine to the WP service guys. 

I'm not finding 40mm ID bushings from any of the common motorcycle suppliers, yet here are 40mm from @Pressureangle's link:

https://www.hydraulicszone.com/mdu-040x044x012.html  ($15US in parts plus $26 shipping, but $50 minimum order.)

There is also the thickness (44mm OD)  and width (12 mm) to consider.

Seems like 40mm Marzocchi would have been very common on 1990s Ducatis?

[andy york]

have you tried the duck dealer? mid 90's  900 SS comes to mind with 40mm marz.

 

[Lucky Phil]

7 hours ago, docc said:

I'm not finding 40mm ID bushings from any of the common motorcycle suppliers, yet here are 40mm from @Pressureangle's link:

https://www.hydraulicszone.com/mdu-040x044x012.html  ($15US in parts plus $26 shipping, but $50 minimum order.)

There is also the thickness (44mm OD)  and width (12 mm) to consider.

Seems like 40mm Marzocchi would have been very common on 1990s Ducatis?

You might need to wait until you have them apart docc and measure them up. Forks are a PITA because although certain forks are used across certain manufacturers at the time they aren't necessarily identical. Guzzi V11 forks for example are quite a bit longer in overall length to say Ducati forks and the V11 Sport triple clamps are around 10-15mm wider than most bikes so using a different front wheel from a Ducati for example or Aprilia is difficult because although the wheel size and brake disks and mount holes are identical the width of the front hub on a Guzzi is a lot wider so disk spacing for the callipers is too narrow. 

Ciao