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421cc ASSASSIN Cylinders BIG BORE Banshee TOP END KIT 4mm Bolt-on 86HP
These are brand new 421cc 68mm big bore stock appearing Assassin cylinders.  This kit is designed to be a bolt on, and will take a normal Banshee into the next level! These come ported to maximize your powerband, and make an insane amount of power. These cylinders are a new design from Driveline Performance which include 68mm Nikasil ...
Driveline Performance

Driveline Performance

421cc ASSASSIN Cylinders BIG BORE Banshee TOP END KIT 4mm Bolt-on 86HP

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Specifications
Specification
Part Brand
Yamaha
Warranty
Unspecified Length
Description

These are brand new 421cc 68mm big bore stock appearing Assassin cylinders. 

This kit is designed to be a bolt on, and will take a normal Banshee into the next level! These come ported to maximize your powerband, and make an insane amount of power.

These cylinders are a new design from Driveline Performance which include 68mm Nikasil bore, triple exhaust ports, larger intake and transfer ports. 

Cylinders are machined to specific heights so there are no spacer plates required, just use your standard .020" base gasket. Stealth look!

The 421cc kit is designed to be used with a 4mm long rod stoker crank (58mm stroke, 115mm rods).

This cylinder kit has higher port timings for riders who are wanting more mid to top end power.

The port specs on these cylinders are 196 exhaust and 124 transfer durations. The exhaust port is much larger than a stock cylinder so peak H.P. will be much higher. 

The last bike we put on the dyno with the 421 Assassin cylinders: 93 octane, Shearer in-frame pipes, V Force reeds, 35mm PWK carbs, 6 degree timing advance = 86 HORSEPOWER!

Kit includes:

2 cylinders Nikasil plated to a 68mm bore size.

2 Wiseco forged 68mm custom piston with a 9 degree dome angle and custom intake window design, rings, wrist pins and circlips.

2 rubber water jacket plugs.

1 .020" base gasket

10 stock style head studs.

Application List
ImageSKU / Part NoApplicationDetailStock
 CYDL421Yamaha YFZ350 Banshee (1987-2006)Out of Stock
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