I installed a Uni pod air filter and re-jetted carb with 38 idle jet and 105 main jet. Runs really nice, but could probably go to larger idle jet and main, especially when weather cools off this fall, but that's a long way off. Next I will try 108 main, my largest main jet.
Took awhile to get it tuned, was pretty sensitive to jetting with pod filter, was hard to start, couldn't tell if rich or lean. I bought after market Keihin 38 idle jet from jets-r-us, don't know why, but this idle jet will not work. I need to throw it away, but keep messing with it, wasting my time, trying to figure out why it doesn't work. I have OEM Keihin 35 and 38 idle jets that work fine, but with this aftermarket 38 idle jet installed the engine will not run. The after market main jets work great and save some $'s, but this aftermarket idle jet wasted a lot of my time.
Previously, with the air box installed, I disconnected the tube from the intake under the plastic body panel and could easily choke the air box for easier starting. With the pod air filter it's harder to choke, so I ended up wrapping it with a plastic bag to choke it. Works great, so I now carry a plastic bag in the box. Another trick I saw on a Genuine scooter make ready vid was to use a vet syringe to pull a vacuum on the fuel auto petcock, works great, and beats sucking on the vacuum line with your mouth. Every time you change a jet you have to recharge the carb bowl with gas, using the syringe makes it easy.
My next project was to tune the CVT. Up to now it was OK, seemed to work pretty well when I first got the scooter. As I learned more and rode it more I realized it likely needed lighter rollers to stay in lower gear longer, and probably needed stronger torque spring to return it to lower gear when the scooter gets slowed down going up a hill, especially with a head wind. With the new pod air filter and larger carb jets the engine sort of came to the CVT and CVT is behaving a lot better. Just seems like the engine is making more torque, accelerates faster, pulls harder, maybe a little faster, but not much faster, but will maintain speed better going up a hill or into a head wind. I am very pleased.
I was concerned about the additional noise, but seems acceptable. I had a neighbor tell me scooter wasn't that loud, definitely noticeable but not offensive. Also, I don't feel like I need ear plugs, so not that loud to me especially with helmet on. The engine always sounded cool with the pipe, but now is even better. Accelerating hard away from a stop sign engine sounds mean, once you are at speed, it has a very pleasing tone as you give it more gas or let off, you can really control the volume, sound, and tone. Music to me.
Cheers
