Cylinder Kit (Big Bore) 443cc ‘Assassin’ for Yamaha Banshee

These are our new 68mm big bore 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 so we can ensure that all cylinder specs are proper for the +7mm (61mm) long rod (115mm) stroker crankshaft. Our cylinders are machined to specific heights so there are no spacer plates required, a standard .020" base gasket is included. 

The 443cc kit is designed to be used with a 61mm or +7mm stroker crankshaft with 115mm rods.

This cylinder kit has moderate exhaust port timing for riders who are wanting a broad usable power band suitable for all types of riding. Cylinders can also be used for drag racing.  

The port specs on these cylinders are 193.5 exhaust and 124.0 transfer durations. The exhaust port is much larger than 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 carburettors that are being installed.

Kit includes:

• 2 cylinders Nikasil plated to a 68mm bore size. Millenium Technologies does the plating on these cylinders.
• 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
• 10 stock style head studs.

******NOTE THESE ARE 68MM BORE CYLINDERS THEY WILL NOT WORK WITH A STOCK HEAD OR SMALL BORE DOMES***

***IF YOU HAVE AN AFTERMARKET HEAD YOU WILL NEED BIG BORE DOMES WITH A 9 DEGREE ANGLE CUT***