These are our new 68mm big bore low 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 lower port timings for riders who are wanting more mid and low range power bands.
The port specs on these cylinders are 191 exhaust and 121.5 transfer durations. The exhaust port is much larger then a stock cylinder so peak H.P. will still be much higher even though the ports are lower durations.
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.
2 cylinders Nikasil plated to a 68mm bore size.
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.