I trying to identify my forks K100 LT frame no 0174385 i have searched old posts + real oem no luck as drawings look slightly different , what im trying to work out is if they are origional or from a different model , i have stripped them to change seals + swap springs for progressive , the forks legs are marked as 87` brembo 1.450.520 + 1 piece mud guard if not origional im stuck as oil level regards archie

Hi Archie.

I have seen some posts for info on the fork oil on this forum. I recenetly changed a seal on mine 84 B reg and was looking to find quantity and viscosity for replacement. seems many people have tried several quantities and different oils, I currently am using 10W jack oil at 360cc per leg. There is a +/- tolerance i think of 10cc anyway so I would suggest trying that from a rebuild as you can easily top it up 10 or 20 cc if it does not suit. also it may saywith the springs which oil viscosity is prefered. I think it is a bit of a minefield to perfectly identify which are original legs as some people have mixed & matched stanchions / legs / spring combinations of time that trial & error may be the best way forward to get the feel you want. I hope this helps..
Ian

as there were modifications to the front suspension over the years try to find out what you've got. Look for markings or shape/size and report back. Original suspension has prescribed amounts of oil, after market spring often require a certain air space in the fork.

Hi guys thanks for yor replys , waiting for new springs , still have not identifed forks i dont think they have ever been apart or changed as every thing else fits & looks stock - mud guard fork brace calipers , going to try 170 mm air gap ( As Hagon site recomends for their progressive springs ) using 5w ATF to start . regards archie