I’d like to thank this forum which has been indispensable for the work I’ve been doing on a Vespa 50cc 2-stroke.
Here’s the configuration:
Malossi 70cc cylinder kit
Malossi (Dellorto) 19mm phbg carb
Stock airbox with 3 extra holes created per the Malossi carb instructions
Malossi red filter
Malossi variator kit and white clutch spring
Following guides found here I started with a 110 jet and have worked my way down to an 82 main jet. Throttle response is very good from idle, slight missing/bogging through the midrange, and very good from 75-100% WOT. Here is the plug chop I did with the 82 after about 4 miles of WOT. What does it look like to you? Thanks