The primary clutch (on the outer flywheel) will pull, but slip, untill the bike goes sofast, that the 2 arms of the secundairy clutch swing out. These will not slip. The three plates of the primary clutch do not need much to start their work. Try tuning the idling speed down while the bike is on the stand. Ride a bit before you do it, so the engine is on working temperature. If you get it to only just hanging on, Turn rhe little screw a bit more down and then up again, until it idles away nicely (the turning up is actually quite important, if you tune it from high to low revs, you'll find that your idling speed has gone down after a few km's) and the rear wheel is in rest, or ocasionally gets a little pull. If your engine doesn't run such low revs, something else is wrong.Good luck.