I know you're asking Lou, (sorry Lou, don't mean to step on any toes) but this "mechanic" is pulling your chain. A 96 with grey lines is a guaranteed repeat business money maker for the shop. The lines cost about $30 bucks in parts to replace. They rot over time and the byproduct of the breakdown is this gummy green sludge. In your fuel lines at every connection is a big pile of this crap. With every use, some of it migrates towards your carb screens. Yours are clogged up again. And the restricted fuel flow causes a lean condition in the piston. When you burn any type of fuel with an overabundance of oxygen, the combustion temps get very high. It will start to melt the rings or pit the piston surface and then the $30 will turn into a $1000 pain in the but. You may have another problem, but this one is critical and will earn the shop the most money. Do this first, reclean the carb and add an in-line fuel filter like Fram's G2. Then troubleshoot the next problem. Look in the tech section of this forum for fuel related guides. This site has covered this many times over and saved my wallet and skis. Good luck man.
Kevin