I have a 10 cub ported before plate. 39mm pwk carbs, vf4, WCR tranny, ect ect. +6 swinger and its a trail bike. Power everywhere. Run a 14 41 gear with 20 inch tires. Very easy to ride slow or fast. Would do it again in a heart beat. If it cant go slow its built wrong. Mine is easier to go slow and put a round then it was when it was stock.
Its gone from..
Stock bolt on bike to
4 mill stock dune play port to
4 mill 421 serval to
to a 465 cub.
All three were better then stock. 465 is the best and 4 mill stock dune play would be second. The serval was fine but the stock cylinder was better.