yamaha banshee yfz350 yfz 350 atv quad rz350 after market big bore performance upgrade cpi cheetah serval cub 421 68mm top bottom end motor engine rebuild kit Banshee 421cc Serval Cub Complete Motor Kit - THE ULTIMATE TRAIL RIDERS MOTOR!&a Serval Cub Cylinders 68/58 4mm. The port specs on these cylinders are 196 exhaust and 124 transfer durations.

Hot Rods 4mm Stroker Crank.

The 421cc kit is designed to be used with a +4mm stroker crankshft with 115mm rods. Case Porting. 1 viewed per hour. The 4mm Serval cylinder kit has been dyno tested to produce 85-89HP. The exhaust port is much larger then a stock cylinder so peak H.P.

These numbers are on pump gas. Condition: New.

I know the 421 cub is a ported serval and the cub have more top end as the serval have more bottom end. Quantity: 2 available / 14 sold. Angled K&N Pod Filters w/ outerwears.

Keihin 35mm PWK Carbs. i got mine from m&m cuz fast was on a 2 week back order on the cylinders think of it this way 421 cubs make alot of topend power just move the 421 cub power down the rpm range and you have the serval i raced my cuzins 450 and i beat him at half throttle because i couldnt shift past half throttle think my shift isnt adjusted right

will be much higher.
Banshee 421 Serval Cylinder Big Bore Top End Kit Cub Cool Head Domes 421 4 mil. Does anyone have any experience or heard anything about the Stage 2 ported 421 serval kits they sale on ebay?

Magnum Outer Clutch Basket. F.A.S.T.

Wiseco 573M06800 (Cub) Pistons.

F.A.S.T.

Cub Kit w/ .020 Base Gasket. 68mm x 58mm plated CPI cylinder (aggressive porting available) Pair of 68mm Wiseco forged pistons Wiseco hi temp piston rings, DLC coated pins, clips Details about Banshee 421 Serval Cylinder Big Bore Top End Kit Cub Cool Head Domes 421 4 mil. Item Information. 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. Cool Head.

Banshee 421 Serval form CP Industries gives you a very nice increase in power and can work with most of your OEM components. Pancake Clutch Bearing.

Pricing is the same for all Serval motors.

Modified Shift Star. Shearer Inframe Pipes.

These are great motors for the daily duner and trail rider. 22cc Cub Domes. Continue reading → They are very reliable with a broad spread of usable power.

Most 421cc 4mm Servals make around 80-85hp on premium fuel.
See Full Description below for included products. This cylinder kit has higher port timings for riders who are wanting more mid to top end power. I know its still a serval but its slightly ported so would it perform more like a cub? Compatibility: See compatible vehicles.