BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Forks !!!!!!! Empty Forks !!!!!!! Fri Apr 11, 2014 5:05 pm

Tradgear

Tradgear
active member
active member
Ok let's face it the 83 K100 is a bit of a rocking horse. Comfy and predictable which is nice. But can I stiffen my front end... (Ooo er missus) without compromising the plush ride. Progressive springs, thicker oil or just a service of the existing bits.

    

2Back to top Go down   Forks !!!!!!! Empty Re: Forks !!!!!!! Fri Apr 11, 2014 5:21 pm

Snod Blatter

Snod Blatter
Life time member
Life time member
My '89 K100 with "S" forks which are supposed to be stiff has a pair of the progressive springs with the tighter coiled bits at both ends from Motorworks in them and it's as soft and wallowy as owt, not recommended. It is possible though that more oil should now be put in, shame they don't come with any instructions! I put 300ml into each fork and the air gap is now 265mm, which is friggin' enormous.

People seem to highly recommend an oil change in these Sachs forks if they're not working properly for you, though stick to 5-10w. If it's too soft stick some more oil in. I have not yet had a chance to test mine with new oil in though, it's been to many bits having new fuel hose put on instead. I've also shoved in about a centimetres worth of washers in each fork, hopefully that'll help a bit too. Old tricks but it's old tech!


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL, '01 R1100GS
http://justbikethings.blogspot.co.uk/
    

3Back to top Go down   Forks !!!!!!! Empty Re: Forks !!!!!!! Fri Apr 11, 2014 5:43 pm

AL-58

AL-58
Life time member
Life time member
Thicker oil will compromise the ride as it increases the damping, It will slow the dive but not stop the dive.

Good fork springs will make it better, I prefer single rate at the correct rate for your weight over progressives which are always a compromise.  If you do go for progressive, look for a true progressive spring that increase the rate continually as the spring compresses, not just a progressive with a soft rate and a hard rate. The soft rate squashes up, then the hard comes into play.

To reduce the dive, more oil of the same rate works by reducing the air gap over the oil.  In an RT I used to use 400ml instead of the recommended 360.  It was recommended to me by a BMW mechanic that worked on the police bikes of the time, many of the police riders didnt like the dive either.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

Forks !!!!!!! K-dogs10
    

4Back to top Go down   Forks !!!!!!! Empty Re: Forks !!!!!!! Fri Apr 11, 2014 6:47 pm

duck

duck
Life time member
Life time member
You can also install dual rate springs. (What I will put on my K75 in the very near future.)

From the Works performance site:

Kits for street bikes, feature a soft initial rate that "crosses over" to a stiffer final rate. This allows a comfortable "cruising" rate in the first part of the suspension movement, but stiffens for big bumps and to resist front-end dive under braking. 


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum