748 Forks in 900ss???

Speedo is cable from the.front wheel.
Steve

 

Just checked my forks, showa forks and they measured 53 mm, battery was nearly flat in my calipers and the measurement was flashing but I checked twice and got 53 both times.
Steve

 

Calipers are 40mm spacing.
Steve

 

I put Multistrada(aircooled) legs into SS yokes on my 907ie(originally RWU Marzocci M1R's). Had the SS top yoke bored out to 53mm no problem, but check the length of the legs where the taper starts, I had to raise the legs 15mm-20mm in the yokes so the bottom yoke clamped onto parallel leg. Bottom yoke should be ok at 54mm.
I used a late Brembo 3 spoke wheel with a speedo drive for the 25mm axle, the Multi uses electronic speedo/spacer. To get the wheel central I had to grind/file 1.6mm off the outer face of the speedodrive. This is no problem the case is thick enough.
The discs weren't central in the (65mm) calipers, I shimmed the calipers inwards with 1mm thick washers.
My speedodrive ratio was different, reading +50%. I used a speedo healer at the bottom of the cable to bring it back, it now reads -7% approx.
I expected the wheel and discs to fit the forks without any messing about but the speedodrive forks do seem to differ from the electonic speedo type.
A couple of times I thought the project was a nono but in the end it was nothing too difficult. Go for it. Cheers, Keith.

 

The calipers off the SS should fit the forks as they are both 40mm fixings. The only real issue I can think of is the front wheel spindle as you've not said what vintage the SS is as the front wheel spindle size changed. The later ones I think are the same size as the 748/916 ones.

 

Watch the year the donor bike is from....the later 748 ran 65mm calipers.

 

Nellys right. Now if you wanted to be über trick you could machine the original SS stanchions to accept the super bike internals.

 

I looked into SBK forks a while back?

Two different caliper sizes as already mentioned, Early and later? Different size axle so you need the sbk wheel, axle and mudguard, also matching rear wheel if relevant?

Someone - does a machined top yoke for an SS to take SBK forks? I THINK you need to machine the top yoke bigger and make up a 1mm thick shim for the bottom yoke??

Possible links on .ms?

This:

SS Suspension

- is good reading? The SBK forks have MUCH better damping than the SS ones, but are a faff/expensive to fit! Alternatively you could get your SS forks rebuilt with Penske Gold valves or similar, keeping your wheel and muddie etc?

 

I have 916 forks in an M900, not sure if the SS has the same yokes (but I believe they are are?) but 916 (& 748) forks are 53mm top and bottom and Monster is 50mm top, 54mm bottom so need to bore the top and shim the bottom.

My forks have radial mounts so the caliper issue is not the same but early 916/748 used 40mm calipers and later (1999 on?) 748 and 996 used 65mm, all have a 25mm axle.

Also 916 forks are longer than Monster forks but don't know if this applies to SS?...

Bushes to shim the 1mm difference in the bottom yoke;



916 forks in Monster;

 

Had them made by a friendly engineer, quite tricky to do actually as they are only 0.5mm thick.

 

SS is 50mm top, 54mm bottom. I am using 1098 forks 53mm/53mm. In my own opinion and others I asked, there is not enough meat left on the standard top yoke if you take it out to 53mm so went to Pro-Mach;


Yokes by Lindsay fae Angus, on Flickr

Tried shimming with beer cans, that didn't work, so got on the lathe;


Front End 004 by Lindsay fae Angus, on Flickr


Front End 005 by Lindsay fae Angus, on Flickr


Front End 006 by Lindsay fae Angus, on Flickr

 

Too right they are tricky! It feels like you are trying to cut fresh air and by the last few cuts they are deforming as you cut and ringing loud enough to need ear defenders.
I also found that although in theory they should be 0.5mm thick, they need to be a wee bit thinner than that.

 

I have SS top yoke bored to 53mm no problem, I used a SSie yoke as they have slightly more meat on them but think a carby one would be ok. SS and SSie have same offset/dimensions. Monster and SS yokes have different offset, monster has less offset..

 

Got 999 Forks on mine, also bored top clamp out loads of meat left on them



I had mine made with top hats, look a bit nicer but mostly pointless, just in my, quite frankly rubbish mechanical knowing that the shims could have potential of slipping out, but really no idea, they look cool though


As for the top clamp bored out


Doesn't look that thin at all

Only real problem I have is with my clip ons, trying to fit 999 clip ons with the standard SSie controls, requires drilling and patience to get them all lined up, otherwise when you first bolt them up, they look like this




Edit: Don't forget you will probably need new front mudguard

 

Not sure on SS but 916, Monster and 1198 mudguards all have the same fixing points and so are compatible and I believe the SS is the same?

 

Possibly, I have an ie and the best way for me to go was 999 forks, because they were all I could find without downgrading brakes and having to change the brakes, but I had to buy a new front mudguard, as the 749/999 fixings are one low at the front of the fork and one high at the back of the fork.

 

I fitted 999 forks that came with their yokes so I had a new stem made, rather than bore out the 900's yokes. The stem screws out of the bottom yoke, making removal/replacement simple