Bimota Forum

[bimotanige]

Hi chaps
Does anyone have a manual/info for 40mm ceriani forks, used on my SB4. Im trying to find out the grade and volume of oil for them. If its a fill level it may be the same as in the more common 38mm ones??
Nige

[akito-man]

Can you not measure the smount removed?, and there must be a formula to which timong drop from a viscosity cup to find the grade?, if you cant get answers!
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wot you got ?...me..well--
sb8r,98 R1,aprilla factory peg,gl1100aspencade!oh yes ford rs turbo s2 ,coz fast bikes n fast cars go together!

[bimotanige]

the seals had gone when I got it and a lot of the oil had leaked unfortunately. The 38mm forks generally take a 10 grade but thought Id ask

[CBar]

7.5 or 10 wt. ATF should work well. Air gap (fork compressed without spring) 160mm from top of fork to fluid.

http://www.wilbers.de/jp/products/products_img/preisliste_2010.pdf

[bimotanige]

Magic Mr CBar - thats a fantastic calalogue with tons of info. The front page cheered me up when I clicked on the link into the bargain

[Les Caddaye]

Bimotanique,
I've also got an SB4 and I'm certain the forks need a rebuild, not leaking but the adjustment dials don't appear to work properly. RHS, only the bottom dial moves and LHS only the top dial moves, the other 2 dials do not budge. Is this "normal" and do you have any info on these forks at all?

Cheers

[bimotanige]

Hi Les
Im just taking my forks apart at the moment. i'll take a few piccis as I do so and keep you updated. No manual for the 40mm forks so it play it by ear. Seals are a standard size - I just cut the dirt scraper off the old seal and glued it onto the new seal to retain the original appearance.
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KB1x2, SB3 SB4 BB1 DB2 Vdue Evo YB11 RB1 Ducati MHR Suzi GS650

[bimotanige]

update on forks. Here is the fork in its component parts.


Each of my forks only have one adjuster on the top of them - this adjusts the rebound damping as far as I can tell and has 6 settings. Have you a photo of your forks Les as they sound different to mine.
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KB1x2, SB3 SB4 BB1 DB2 Vdue Evo YB11 RB1 Ducati MHR Suzi GS650

[Les Caddaye]

Bimotanige,
See attached photos, top knob can be adjusted LHS, bottom ring stationary. On the RHS the top knob does not rotate, only the bottom ring. Seems I have 8 adjustment points, 0 - 7.

Cheers

http://www.bimotaforum.co.uk/uploadimagedisplay.php?imageid=X39A2465
http://www.bimotaforum.co.uk/uploadimagedisplay.php?imageid=44805949X[/img]

[bimotanige]

Hi Les
As below my forks are only rebound damping adjustable. They are really easy to take to pieces -about 15 minutes a side and you can get everything out while they are still in the yokes.
Just a thought I wonder if one fork is compression damping and the other fork extension damping as in quite a few other bikes? You would have to compare the components inside

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KB1x2, SB3 SB4 BB1 DB2 Vdue Evo YB11 RB1 Ducati MHR Suzi GS650

[Les Caddaye]

Nige,
Thouight about that but I won't really know until I pull them apart or find someone who knows something about them. Starting to think the knobs and rings on top of fork are a Bimota fitting, not Ceriani or Forcella Italia???

Cheers

[crankcase]

Ducati 750F1s with Ceriani forks also had the same adjuster- so 'almost' surely from Ceriani
Ian
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Bimota DB2 tricolore, Bimota YB4e.i, Ducati 851 tricolore, Ducati Hailwood Replica, 1968 Gitan Grillo sport, Yamaha GTS1000, Honda Deauville, Honda GB500 Clubman
http://thecrankcase.com