The prospect of a horsepower bump approaching 50% using plug & play parts costing $245 shipped has proven irresistible. I have succumbed to temptation and pulled the trigger on a Malossi 177 cast iron cylinder kit for my Stella (not to be confused with Malossi’s older 166 kit). I chose the Malossi over the comparable DR and Polini kits because the design is at least 10 years newer and I imagine the industry must have learned something in that time. I chose it over the comparable VMC kit because the VMC kit is not readily available in the US and shipping from Europe makes the VMC kit too expensive.
I have a couple of questions to ponder while I await delivery.
First, Malossi does not recommend a larger carb. It only recommends using the jetting supplied with the kit, which seems very rich (52-140 idle jet and BE4 mixer tube). For a main jet, they supply a 105 and a 115, the choice depending on whether some of the rotary valve is cut away. Of course, the Stella has a reed valve. Am I right to think that means I should start with the 115?
Second, I was expecting to upgrade from a 21 to a 22 tooth clutch, but Malossi recommends a 23/64 clutch/primary combo, a straight cut version of which Malossi just happens to sell. Overkill?
Last edited by Kowalski on Fri Oct 02, 2020 7:55 am; edited 1 time in total