The bushings (in and SRX and RX1) in the secondary (on the moveable sheave and the helix) will wear into an oval shape since the amount of rotational travel is limited to very little rotation yet the force on the bushings is not symetric about the dia. of the bushing. If you can tell they are oval by "feeling" the amount of play in differenet directions or by measuring them, then they are worn out. The bushings in the moveable sheave AND the helix keep the moveable sheav from rocking about the shaft in the secondary clutch. Do not replace just one bushing, If you do it will wear out much, much quicker than if you replace both. Excessive slop and an oval shape will cause erratic action of the secondary particularly on the upshift when the belt is trying to force the sheaves apart. You say you can accelerate the engine speed but the sled will not move. When that happens, have you taken a look at the position of the belt height in the secondary clutch? I had a similar problem on my RX1. The secondary clutch would often not backshift while I was slowing to a stop. When i went to take off, the belt was sitting low in the secondary. The secondary was binding, I cleaned it up and has worked fine ever since. Check the operation of the primary without the belt on the sled. Gradually accelerate the engine, the primary should close smoothly once the engine hits the engagement speed. Check the rollers and weights for free movement. Tug and push on them. You should not be able to feel any play in these parts. I had a set of weights in which the bushings had shifted slightly out of the weight causing them to bind. You can check the primary bushings for play by taking the spring out, reassembling the cover without the spring and rocking the clutch up and down on the shaft. There should be very little play. Slop or play here will also cause binding. Again, replace the bushings in the primary in pairs, replacing one one worn bushings is useless. KMake sure everything is clean, clean clean. Dishwashing soap and hot water is the best cleaner to remove the grimmy belt dust, much better than solvents. Take your time, check everything out, the clutch system uses simple devices so I am sure you will find the source of the problem.
Also, check the "wrap"f the spring in your secondary clutch. The wrap is the position of the spring in the clutch sheave and the position of the sping in the helix. To light a "wrap" will reduce the amount of force the spring puts on the system.
