So, how does one tell the difference between a Fichtel Sachs / Showa / Marzocchi fork used by BMW on different K-bkes at different times? by looking for part numbers or manufacturer's marks?
The challenge I'm facing right now is the bike handles poorly; it is very twitchy in corners when leaned over. My goal is to understand what preload and sag adjustments I have available to me based on the type of fork currently installed on my bike. To achieve this goal, I feel that knowing what manufacturer of forks will lead me down the path to understanding which adjustments I have available and what after-market parts can be fitted to improve the situation.
My bike was originally a modified '88 K100RS with parts added from different K-bikes types and vintages over it's lifetime. I think the forks are from either a late model 16V K100 or K1100 (I know this because I have two-piece front fender with integrated fork brace, hydraulic splitter mounted on the brace, 3-spoke front and rear rims and 4-piston Brembo calipers on the front). According to
the BMW K-bike mechanical history page at Anton Largiader's site, Marzocchi forks were used on the 4V K100RS, K1, and K1100RS/LT without changes. So, chances are I have Marzocchi forks.
Here is some additional information: At first blush, I appear have the following identifying fork parts on my bike: 31422310799 INNER TUBE, BLACK, LEFT - ABS and 31422310876 BRACKET. These are part numbers for the following models: K100RS (89V1) 03/89-06/92, K1 (89V1) 08/88-09/93, K1100RS (89V2) 04/92-12/96. What I don’t have on my bike (although these numbers are for the fiche for my model year) is: 31421454324 INNER TUBE, BLACK, RIGHT - D=41,4MM and 31421457900 STABILIZER, POLISHED. Would this confirm Marzocchi forks?
TIA.