Originally Posted by BC_Dan
Have you tried adjusting spring tension? There should be an adjuster that is rotated using a spark plug socket to increase or decrease tension. Look for a small block that engages the short end of the spring. The block has long ends and shorter sides; using the long end will apply more pretension to the torsion springs for two people. If you adjust to the long setting and it's still not adequate, there are two or three different spring weights available. A heavier spring will give more lift for two-up riding. The bad part; after installing the spring, the suspension will be harsh when riding one up.
A dedicated 2-up machine often has a mechanism to easily change spring tension when going from one rider to two. My Prowler has an additional spring that can be engaged or disengaged. If you do a lot of 2-up riding, you may want to consider one of those.
Welcome to the forum!
I believe you're referring to the adjuster block for the torsion spring. With that in mind, I will make the following comments...
Adjusting the spring does not require any tools. Rock the sled onto its side and "balance" it (having a second person makes this much simpler the first time you do it, but I routinely do this alone). Grab the long section of the torsion spring and compress it so that you can lift if off of the skid, pull it slightly outward from the skid, then allow the spring to decompress fully. At this point, you can rotate that block by hand and reverse the procedure to put the spring back. Roll the sled to the other side and repeat the procedure.
If you do decide to installer the heavier torsion springs, you can swap back and forth between the "light" and "heavy" settings using the above method pretty much "at will".