Fork drop through?

Redders · 27-10-2020, 11:29 AM

My forks on my 900 sie look to be dropped through the yolks be quite a bit, would anyone have a measurement so I can check ?thanks

vince53 · 27-10-2020, 12:21 PM

the drop through alters the "turn in " so to speak , more drop through the quicker it turns in ,the less the slower it turns in , i had about 15mm to 20mm drop through on mine it was nice and handled fine , there should be lines around the top of the forks so you can try whats best for you * ) , im sure some one will come along with factory standard .... Lud's usally your man ..

Luddite · 27-10-2020, 12:54 PM

My first Monster was a 900Sie like yours but it was a while back and my memory's not what it was...

My first Monster was a 900Sie like yours but it was a while back and my memory's not what it was. If I remember correctly, the standard height results in about 20mm of fork top showing above the top yoke. I think the workshop manual said the distance from the top of the bottom yoke to the top of the fork was either 280mm or 296mm so you could see how that looks. If you can't get to 296mm because the fork tops hit the bars, then the 280mm is probably correct. How much fork top is currently showing?

Mr Gazza · 27-10-2020, 01:10 PM

My forks show 20mm out of the yoke, that's to the top of the flat on the fork end, not to the top of the hexagon.

20mm is about as far out as they will go without hitting the handlebars, which, incidentally are mounted on higher risers on the Sie.

It's all relative really, if you play around with the rear ride height then you should adjust the front to suit as well. unless you're looking to change the handling characteristics.

If you have less fork out of the yoke then it will require more steering effort but be more stable, more out of the yoke will lighten the steering but slightly reduce stability.

In conjunction with the rear ride height; raising the rear does the same as dropping the front and vice versa. Obviously if you wish to retain your present geometry then you need to do the same to both ends.

You're not likely to make it dangerous by over adjusting but do make sure that both forks are the same amount above the yokes.

I seem to remember the 280 and 296 measurements from the bottom yoke don't make much sense. I wouldn't worry too much if yours's doesn't match those figures.

slob · 27-10-2020, 01:41 PM

Depends whether it's an Sie or ie according to the MY00 manual

Darren69 · 27-10-2020, 02:51 PM

Quote:

Originally Posted by slob

Depends whether it's an Sie or ie according to the MY00 manual

I wonder if that is to do with the ie's having the later ST type frame while most of the Sie's still had the old M900 frame, with the suspension hoop? There was a slight difference in the frame geometry between them iirc.

Luddite · 27-10-2020, 02:57 PM

A good point from Mr G - all measurements should be taken to the flat part of the fork tops, not to the top of the adjusters.

Thanks for those, slob. I see the measurements are taken from the bottom of the lower yoke, not the top, as I had thought. Confusingly,(for me anyway), the measurements for my Evo are taken from the top of the lower yoke.

For what it's worth, here's a publicity shot of the 900 Sie showing the amount of fork above the yoke as a guide. (Of course, there's no guarantee that they were correctly set up for the photo!)

Darkness · 27-10-2020, 03:09 PM

The top yoke looks to be central to the machined part of the fork leg.

slob · 27-10-2020, 03:22 PM

Quote:

Originally Posted by Darren69

I wonder if that is to do with the ie's having the later ST type frame while most of the Sie's still had the old M900 frame, with the suspension hoop? There was a slight difference in the frame geometry between them iirc.

Depends 900(S)ie is the last of the hoop frames 2000/2001. With the older yokes.
The S4 arrives with the tie-rod rear suspension in 2001/2002.
There was a 2002 900ie with the newer frame/yokes.
Luddite’s pic is the earlier type with two pinch bolts each side on the top yoke.

27-10-2020, 11:29 AM	#1
Redders Registered User Join Date: Oct 2020 Location: NOTTINGHAM Bike: M900sie Posts: 8	Fork drop through? My forks on my 900 sie look to be dropped through the yolks be quite a bit, would anyone have a measurement so I can check ?thanks

27-10-2020, 01:10 PM	#4
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,806	My forks show 20mm out of the yoke, that's to the top of the flat on the fork end, not to the top of the hexagon. 20mm is about as far out as they will go without hitting the handlebars, which, incidentally are mounted on higher risers on the Sie. It's all relative really, if you play around with the rear ride height then you should adjust the front to suit as well. unless you're looking to change the handling characteristics. If you have less fork out of the yoke then it will require more steering effort but be more stable, more out of the yoke will lighten the steering but slightly reduce stability. In conjunction with the rear ride height; raising the rear does the same as dropping the front and vice versa. Obviously if you wish to retain your present geometry then you need to do the same to both ends. You're not likely to make it dangerous by over adjusting but do make sure that both forks are the same amount above the yokes. I seem to remember the 280 and 296 measurements from the bottom yoke don't make much sense. I wouldn't worry too much if yours's doesn't match those figures. __________________

27-10-2020, 03:09 PM	#8
Darkness . Join Date: May 2007 Location: Stockbridge Bike: M900 Posts: 1,984	The top yoke looks to be central to the machined part of the fork leg. __________________ Original and Best since 1993

27-10-2020, 12:21 PM	#2
vince53 Registered User Join Date: Sep 2018 Location: taunton Bike: M1100s Posts: 41	the drop through alters the "turn in " so to speak , more drop through the quicker it turns in ,the less the slower it turns in , i had about 15mm to 20mm drop through on mine it was nice and handled fine , there should be lines around the top of the forks so you can try whats best for you * ) , im sure some one will come along with factory standard .... Lud's usally your man ..

27-10-2020, 12:54 PM	#3
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	My first Monster was a 900Sie like yours but it was a while back and my memory's not what it was... My first Monster was a 900Sie like yours but it was a while back and my memory's not what it was. If I remember correctly, the standard height results in about 20mm of fork top showing above the top yoke. I think the workshop manual said the distance from the top of the bottom yoke to the top of the fork was either 280mm or 296mm so you could see how that looks. If you can't get to 296mm because the fork tops hit the bars, then the 280mm is probably correct. How much fork top is currently showing?

27-10-2020, 01:41 PM	#5
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,710	Depends whether it's an Sie or ie according to the MY00 manual

27-10-2020, 02:57 PM	#7
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	A good point from Mr G - all measurements should be taken to the flat part of the fork tops, not to the top of the adjusters. Thanks for those, slob. I see the measurements are taken from the bottom of the lower yoke, not the top, as I had thought. Confusingly,(for me anyway), the measurements for my Evo are taken from the top of the lower yoke. For what it's worth, here's a publicity shot of the 900 Sie showing the amount of fork above the yoke as a guide. (Of course, there's no guarantee that they were correctly set up for the photo!)