Hi from south of Norway. 
I have the 625 Touring, 21 model, still not fully broken in. Think this is the same model as 21 mod 600 Touring in US?. Anyway. I want to share my experience with hard shifting. From day one it was very hard/impossible to shift between any position, even on flat surfaces. I suspected that there was some pressure on the gearbox @ idle, removed the cover and had a look. I noticed that the primary moved in slightly and started pinching the belt, not enough to move the machine, but still some drag on the belt. When checking what spring I had, it was marked only with colors, no number visible, but i think it is 0951-1013 gold/yellow/blue 200 400. So the 200N upon engagement might be a little on the low side, so I decided to add a shim to increase the pre-tension slightly.
I took some measurements and 3D printed a shim (Nylon filament) for the spring. I did some testing with shim sizes and found 3,5mm was ok in my setup. The RPM was raised 100 RPM ish before engagement with the 3,5mm shim. If your setup is different, the shim requirement will be different.
I have also added some weights to the primary to lower the RPM. This will of course lower the engagement rpm, worsening the issue. So the combination 23g (16+7) weights, orginal spring Gold/Yellow/Blue (200N/400N) and 3,5mm shim appears to have the problem solved for me. Will perhaps change the shims to steel, but so far the shim holds up fine. Nylon can handle quite high temps and resist oil. The shim dimension is ID 35,5mm OD 50mm Thickness 3,5mm. Note there are some rounded edges inside the clutch housing, so make sure the shim is properly inserted to the bottom.
Best regards Torstein
I have the 625 Touring, 21 model, still not fully broken in. Think this is the same model as 21 mod 600 Touring in US?. Anyway. I want to share my experience with hard shifting. From day one it was very hard/impossible to shift between any position, even on flat surfaces. I suspected that there was some pressure on the gearbox @ idle, removed the cover and had a look. I noticed that the primary moved in slightly and started pinching the belt, not enough to move the machine, but still some drag on the belt. When checking what spring I had, it was marked only with colors, no number visible, but i think it is 0951-1013 gold/yellow/blue 200 400. So the 200N upon engagement might be a little on the low side, so I decided to add a shim to increase the pre-tension slightly.
I took some measurements and 3D printed a shim (Nylon filament) for the spring. I did some testing with shim sizes and found 3,5mm was ok in my setup. The RPM was raised 100 RPM ish before engagement with the 3,5mm shim. If your setup is different, the shim requirement will be different.
I have also added some weights to the primary to lower the RPM. This will of course lower the engagement rpm, worsening the issue. So the combination 23g (16+7) weights, orginal spring Gold/Yellow/Blue (200N/400N) and 3,5mm shim appears to have the problem solved for me. Will perhaps change the shims to steel, but so far the shim holds up fine. Nylon can handle quite high temps and resist oil. The shim dimension is ID 35,5mm OD 50mm Thickness 3,5mm. Note there are some rounded edges inside the clutch housing, so make sure the shim is properly inserted to the bottom.
Best regards Torstein