u/Primary_Wrap_6325

Have a 2005 Tomos Streetmate. Want to go 40ish mph. Stock PHVA Dellorto carb. Jets are 66, 40, and 25. Swapped exhaust to Tecno. Deleted oil injection. Had a metal cone filter that just broke, still have the stock air box. I live in a hilly area in Washington. Not super steep but I’m currently going like 20-25 mph up inclines. I’m the original owner but have hardly ridden this over the years. It was sitting since 2020 but I just got it started and it works great considering.

Plan to get:

-70cc airsal kit

-Uni filter

What jet sizes?

Front/rear sprockets?

How hard are the sprockets to change?

Also are there any examples of what it should sound like? What is 4-stroking?