I'm a heavy guy, I weigh 90kg + 10kg luggage, so its a total of 100kg everyday when I go to a 20km ride to work using my little zoomer. I feel that the start dash is so sluggish that I always get left behind by other gentsuki riders even I already installed an IMAP.
I decided to try changing the variator with this one. I also bought a pack of 5g weight roller from Kitaco also to complete the setup. After installation and few test runs I notice a big improvement on acceleration, it became faster yet it can still retain a decent top speed and good torque on mid-range speed. Yes, the start dash is surprisingly fast but the engine is screaming too loud on takeoff (5‾10km/h), so I decided to change setup again. =(
I ended up changing the weight roller again to this setup, "Kitaco 5g x 3pcs" + "Honda Stock 7g x 3pcs". After installation, I take it out for a test ride starting from our house to my workplace and then back. It works so much better now and decided to stay with this setup. Faster start dash without the engine screaming too loudly and still retaining the power on mid-range speed even on uphill and finally a decent top speed.
My current setup: Honda Zoomer FI, IMAP set to 10,000 RPM, Variator: Kitaco Power Drive Kit, Weight Roller: Kitaco 5g x 3 & Honda Stock 7g x 3. I will try testing a 6g x 6 roller weight next time.