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YAMAHA BANSHEE 421cc BIG BORE ASSASSIN HP CYLINDER KIT

$799.00

Product Description

These are our new 68mm big bore high port timing stock appearing Assassin cylinders. These cylinders are a new design from Driveline Performance which include 68mm Nikasil bore, triple exhaust ports, larger intake and transfer ports. We machine these cylinders in house on our CNC so we can ensure that all cylinder specs are proper for the +4mm long rod stroker crankshaft. Our cylinders are machined to specific heights so there are no spacer plates required a standard .020" base gasket is all that's needed. 

The 421cc kit is designed to be used with a +4mm stroker crankshft with 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 then a stock cylinder so peak H.P. will be much higher. 

We have tested multiple exhaust manufacturers on our cylinders and most of them perform well, obviously the better the exhaust the more H.P. that will be achieved. Peak H.P. and power curves will also vary depending on the amount of compression and timing you choose to use along with the quality of reeds and carburetors that are being installed.

  • The dyno graph shows what H.P. can be achieved with the right components. That particular engine had our 421HP cylinders as plated with pump gas domes (93octane), V-force reeds, 35mm Keihin carburetors, 6 degree's of timing and Shearer small bore inframes. 
  • Horsepower numbers will vary depending on the pipes, carbs, reeds, etc,etc, that are being used. Please don't ask us what H.P. numbers are capable with your pipes, carbs as we have not tested every single part that's available for a Banshee. This graph is just to give an idea what is achievable.

Kit includes:

2 cylinders Nikasil plated to a 68mm bore size. We use Millenium Technologies for the Nickasil plating.

2 Wiseco forged 68mm Blaster style pistons with our custom intake window design, rings, wrist pins and circlips.

2 rubber water jacket plugs.

1 .020" base gasket

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SKU:
CY421HPK