Fork Service/Rebuild

[Fireypete]

Geez I'm posting a bit here

So with the wheels on I gave the front a push. Suspension went down and came back up but without much enthusiasm. No leaks/marks on the forks, just doesnt feel great. Maybe with me on boaerd riding it may feel better but the bike is a while away before it hits the road.
Wondering if anyone has drained the fork oil throught the drain screw and put in new springs and fresh fluid whilst forks are on the bike.
Put it on a front stand, drain oil, push the forks down and put oil in, lift, drop in springs forks cap on and.... sounds easy...too easy...
Hyperpro make a kit which isnt too expensive, postage is not too bad Dunno if there are many options here in OZ.

[Mc tool]

One thing , Make damn sure the bike cant fall off whatever you are using to hold it up . I have seen more than once where when the weight comes off the front suspension, bike front end drops and the whole plot rolls forward off the stand and falls over , and if its on a bench/table its a long way to the floor . Oh my Guzzi was fine because it landed on Dianne's bike ............she was far from fine

[Kiwi Rider]

Just my 10 cents but for what its worth I would take those forks out and pull em apart as that oil will be well old and you wont be able to clean them properly in place. Also a chance to replace the fork seals as they will be old too and being made of rubber... not an expensive part.
That's what I did with mine anyhoo. A stand that locates inside the bottom of the steering stem is essential for this job.

[Fireypete]

There is a lot of 40mm seals out there. Is it anything for a 40mm marzocchi fork? The genuine part number doesnt seem to generate a set.

[Mc tool]

There are heaps on ebay ..... ,just search 40mm marzocchi fork seal

[brad black]

i'd pull them and give them a good clean.

you can get bushes for the m1bb as a beta part (?). SBT280414111 inner, SBT280414134 outer. https://www.splatshop.co.uk/splat-marzo ... h-kit.html

seals and scrapers are the same as 90's 40mm usd marzocchi in 600ss or m600. seals have lots of options - genuine 93040191A, ariete ari.023, genuine scrapers 34910052a.

i cut the springs down to increase the rate. i take them down from 40 to 32 coils, which takes them from 0.7kg/mm to 0.9kg/mm. Shortens them by 60mm or so, so you need to increase the spacer length and set the preload as required.

i use 7 weight oil in the lh leg, and repsol 15w30 in the rh, set to 200mm. lowering the oil level stops the air spring effect being excessive toward full compression.

[Tamburinifan]

Brad,
is this in your 851 or general in M1r forks?

[brad black]

this is m1bb 40mm as per 750 sport and 900ss.