Never worked on the shim type valves before so it was nice to be able to use a little trial an error to determine an ideal shim size. It also comes with a lot of shims so I can help out friends as well. I'll never use them all.
Easy to install and for my bike the auto demcrompession mechanism was already installed. Great power increase especially in low to mid rpm. This installed with Hot Cams stage 1 intake camshaft really woke my scooter up.