• Serval Cub Top End Kit

** AT THIS TIME, ONLY 421CC 4 MM KITS AVAILABLE **


Made in the USA!

*** With Free Clean-Up Port ***

 Serval Cub: The powerband on these are designed to come on much sooner than the Cheetah Cub and can make in excess of 75 (stock stroke) -100HP (521cc) on premium fuel with the correct setup. Most of our 421cc  4mm Servals make around 80-85hp on premium fuel.  They are a duners dream and great for the F.A.S.T. trail rider looking for the ultimate in performance, reliability and torque! Very fun and F.A.S.T. to ride motor with great usable HP. If you like to race and still have good torque for playing around — these are the cyls for you!

Kit Includes :Cylinders w/ clean up port, 2x Wiseco pistons, 4x water plugs, 2x stud extenders, base gasket, F.A.S.T. Racing Custom domes, and 2 x 12pt ARP cub base nuts.

Available in stock stroke, 4mm, 7mm, 10mm.  NOTE: Trenching required for 7-10mm and case boring required for 72mm Bore.

Give us a call for the best price and recommendation on a build quote that suits you.


Play/Dune porting also available for even more HP (7-8hp gain) without loss of torque. $350

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Serval Cub Top End Kit

  • Product Code: CP-Serval Cub Top End Kit
  • $1,235.00


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