Impellers......
The stock pitch of the 717cc engines in your speedster is 14/22. Like JPX points out, is available in our partswarehouse.
If you go for an aftermarket impeller, you can use a 16/21 or 16/23.
Impeller pitch. To understand the impeller pitch, the first number is teh degree of blade at the hub. The second number is the degree of the blade at it's outer most edge. :cheers: