Hi Brodes, I did a post a while back on the subject regarding the ST1050 clutch, here is some of the post that may be of use to you. The machine I was working on had an excessive clunk when engaging first gear, and changing from first to second. I would point out the following, the clutch basket springs at the rear, there are 6, you will find 3 of those springs are very loose, do not think there is a fault, they are designed to be like that, the reason being they take up the tension in the offset ring gears when meshed under load, when re installing there is a hole drilled into both ring gears, this allows you to place a suitable drift into it to align both the ring gears that in turn will then mesh with the drive from the crank, once that is done, place the spacer onto the gearbox shaft and push it home in the basket. Also important is there are two different torque settings, this depends on the engine number (the one fitted to your machine (look it up) any issue come back to me, the difference between the two is 50nm, this may explain why the nut worked loose if the incorrect torque was used, there is no locking washer, just torque to the correct setting. you can then release the tension on the ring gears and build up the clutch in the following sequence. Anti judder seat washer Anti judder spring (it is important to install this concave side outwards) think of the spring like a dished dinner plate, the dished side goes outwards Thick friction plate Thick steel plate Thin friction plate Thick steel plate Thin friction plate Thin steel plate Thin friction plate Thin steel plate Thin friction plate Thin steel plate Thin friction plate Thin steel plate Thin friction plate Thin steel plate Thin friction plate Thick steel plate Thin friction plate Thick steel plate Thick friction plate Don't worry if you get them mixed up for whatever reason, you can measure both the steel and friction plates to give you the required measurements to allow you to put them on in the correct order, also the thicker friction plates are slightly different in colour. All this for a £4.50 spring that should have been stronger in the first place, the new German engineered spring has more tension. All buttoned up and now running with a silky smooth gearchanges (not a clunk to be heard). I have uploaded a few photos, although not in sequential order.
Much obliged! I will definitely have to keep this in mind if I ever have anymore issues with it (fingers crossed I don't).
