I've just installed the Malossi Multivar 2000 (variator) on a 2013 GTS 300 i.e. It's a fairly new engine with about 350 miles on it so far. Right now it has the 14 gram roller weights. On a level street, it performs nicely, but when I'm going up mountain roads, especially at slower speeds, it's very "revvy" at around 20-30 MPH and the engine is heating up, with engine temp moving up (but below the red) and kicking in the cooling fan until I'm level again.
One Vespa dealer suggests that I increase the weights to 15 grams and another suggests using the lighter 13 gram roller weights. Which way to go? It would be great to hear some feedback from those of you who have some experience with this.