Monster 900 bottom yoke wanted

I’m looking for a 900 Monster bottom yoke For my 98 monster if anyone has one they want to sell.

[Albie]

Originally Posted by Davektm

I’m looking for a 900 Monster bottom yoke For my 98 monster if anyone has one they want to sell.

I had a mint one for sale for 3 years. Couldnt sell it for love or money. Sold last week for £15.to a European buyer. Vapour blasted and replate fittings too. I'm sure there are more out there but not as good condition.

[chris.p]

Is there any difference between 600 to 900 monster??

[Dukedesmo]

Originally Posted by chris.p

Is there any difference between 600 to 900 monster??

As with the frames, AFAIK they are all the same?

[Nasher]

Not sure if the one I have hanging around is 900SS or M900.
Will have a look later.

Nasher.

[chris.p]

I have this one on Ebay https://www.ebay.co.uk/itm/254638780994

[Nasher]

Chris.P

Just looked at your ebay ad.
I'm convinced the SS and Monster ones are different.

Will have to have a look in the garage shortly.

EDIT
Maybe not, my M900 and 900SS ones look the same.
Not sure about the geometry though.
Worth checking the Stein Dinse website to see if the part numbers are the same.

Nasher.

[Dukedesmo]

Originally Posted by Nasher

I'm convinced the SS and Monster ones are different.

I maybe wrong but I think the offset is different?

IIRC, Monster has smaller offset (25mm vs 30mm?) making it more 'flickable'/less stable...

[Nasher]

Originally Posted by Dukedesmo

I maybe wrong but I think the offset is different?

IIRC, Monster has smaller offset (25mm vs 30mm?) making it more 'flickable'/less stable...

Just had another look and the above is correct.

Definitely less offset on the Monster by about that amount.

And the spare one I have is SS.

Nasher.

[Albie]

Originally Posted by Nasher

Chris.P

Just looked at your ebay ad.
I'm convinced the SS and Monster ones are different.

Will have to have a look in the garage shortly.

EDIT
Maybe not, my M900 and 900SS ones look the same.
Not sure about the geometry though.
Worth checking the Stein Dinse website to see if the part numbers are the same.

Nasher.

They are but minimal. It's just offset. Height width and bores the same. It's a gamble but not a huge one.

Part number s are different but castings say not.

[Mr Gazza]

I just pushed a Monster top yoke over the protruding leg tops on my SS. The stem nut does not register correctly, so there is approximately 5mm difference in the offsets.

So SS bottom yoke is not compatible with Monster top, but you could use a pair with due regard for the different trail (except you would then have no handlebar clamps!)

Quite good that this has been brought up as I had assumed they were the same and plan to fit Monster yokes to the SS, so now I know I need to address the trail.

I'm not entirely sure but I think the stems could be different lengths too, as the nut is proud on a Monster and flush, if not recessed a bit on the SS.

[Darkness]

Would I be right in thinking the Monster yokes have the fork legs approx. 5mm closer to the steering head, so the trail of the front wheel is increased by 5mm too?

By “Front Wheel Trail” I’m meaning the horizontal distance on the ground between the centre of the tyre contact patch and the intersection with a projected line of the steering head axis.

It would be interesting to compare that change with the magnitude of increase/decrease in front wheel trail when you raise or lower the forks in the yokes or adjust the height of the rose joints in the rear suspension wishbone/tierod? Of course dropping the front, or jacking up the back end affects caster angle, wheelbase and other aspects too.

That could be how the racers try to get the Monster back to 888 and SS geometry.

[Dukedesmo]

Originally Posted by Darkness

That could be why the racers try to get the Monster back to 888 and SS geometry.

I don't claim to be an expert in suspension but my 916 has 30mm (I think) offset, same as 900SS, 888 etc. and probably all the racers?

It has to be said that the steering is far more stable/less twitchy than the Monster (realise there's more to it than just the offset) and for a more extreme example, my old Guzzi has around 60mm offset, along with more raked out forks and that's as stable as a freight train - I have no idea why it's even got a steering damper!!

[Mr Gazza]

Originally Posted by Darkness

Would I be right in thinking the Monster yokes have the fork legs approx. 5mm closer to the steering head, so the trail of the front wheel is increased by 5mm too?

By “Front Wheel Trail” I’m meaning the horizontal distance on the ground between the centre of the tyre contact patch and the intersection with a projected line of the steering head axis.

It would be interesting to compare that change with the magnitude of increase/decrease in front wheel trail when you raise or lower the forks in the yokes or adjust the height of the rose joints in the rear suspension wishbone/tierod? Of course dropping the front, or jacking up the back end affects caster angle, wheelbase and other aspects too.

That could be how the racers try to get the Monster back to 888 and SS geometry.

You fairly well echo my thoughts as I walked away from SS after the little try on.

The SS fork legs protrude from the top yoke by about 50/60mm and the clip ons, fit above the yoke.

I had thought that when I do the swap to monster yokes that bringing the bike up on the legs (less leg above the yoke) would slow the steering right down, by increasing the trail/castor, but now I have discovered the offset difference I am hoping that it will come back to close to either the original SS geometry or the Monster's.
Since I don't know any of the specifics of the geometry of either bikes without measuring carefully, this is all hopeful speculation.
I doubt they differ very much, but get there in different ways.
Since I will be hacking the rear right off the SS and adding different suspension, I do have the option of tuning it via rear ride height. It will need some careful sums, a little educated guesswork and then the building in of some adjustability in the ride height. Adjustable shocks being the easiest solution I think.
I daresay it will take a few test rides to get it right, but I shouldn't be too far out if I stay somewhere near the SS and Monster geometry.

[chris.p]

If you check the part number on the picture it is for a monster I believe, but we used monster or SS for the DD race bikes