Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Not so fast, those are the progressive springs I have in my CB500K2-ED and they are definitely OEM. These springs were also on: the C550K, CB550K!, CB550K2 and the CB500T. They measure the same as mine and should be fine. I have best results with max 140-145 cc of 7,5 weight fork oil.
Parts books correct! Check the gearbox page and explain to me where the forth selector in the quantity list fits.
The measurement i gave was from a NOS 374 spring out of the packet with numbers ending in 000. Todays listed spring is ending in 003, that means it has been superseded or it comes from another supplier meaning, it will be a different spring. Boing goes Zebedee
So, pring length is now clarified.My friend had a look into CB500T HSM, here are data:Free standard length : 466mmService limit : 440mmSo my springs are OK - no need to change them Oil volume is another story - my CB550K1 genuine owner's manual says 160-166 cc (5.4-5.6 ozs).