Not as pricey as the Kenda Tire, these Innova's look just as good, and seem to have the equivalent tread life.
10 inch diameter tire fits 4 inch diameter rim.

Velocity stack kit includes tunable velocity stack, choke, and mounting bolts. Features a tuning needs that allows proper adjustment of air flow to top barrel of carb. Only works with the stock dual barrel carb.

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By putting a larger drive sprocket on your Dirt Dog or X-Racer you can raise the top speed of your gas scooter. However, you will sacrifice some power (you'll go faster but it's harder to climb a hill).

Complete air filter kit w/choke for the Evo 2, 2X, and SPX. Includes ADA Racing® air filter & velocity stack w/built-in choke.

Improves performance and quiets air intake noise. This is the first engine upgrade you should invest in. Provides a very high tech look to your engine, sounds great, and doesn't require the oiling like the stock air filter does.

New Kenda K671 tire with stylish new pattern. 10" diameter tire fits 4" diameter rim.

Universal Fuel Filter Display Pack of 20 Right Angle Visu-Filter Premium In-Line Fuel Filters. Visu filters hold more filtered fuel than any other comparable filters. The clear PET housing is gas, diesel and alcohol resistant.

Add another 3 to 4 MPH with this racing head designed to fit the engine on your ScooterX Dirt Dog or X-Racer. Can be combined with the Powerpipe for a very fast combination. Replaces your existing top end.

This what I run on my Evo Powerpipe (pic on details). I like the look of the straight back exhaust.

I would not recommend running this without the pipe, since the exhaust will shoot straight down on to the scooter.