Hello All,
I have started the process of getting a new engine for motorcycling purposes. The bike will be used not for racing but for track days (see http://www.nolamotor.com/)
which is riding as fast as you can stand for 20 minute sessions, one session per hour, six sessions per day total. I do three to four track days per year. As an old two
stroke guy, I want my new engine based upon the yamaha rz350/yfz350 banshee and the research for information on this engine has led me to this forum. I had no knowledge of the banshee world and what you guys are getting out of what is essentially a 30 year old design is really impressive.
My goal is to have an engine that can at the very least keep up with the current 600cc four stroke bikes which have about 50 lbs/ft of torque, 115 crankshaft horsepower
and weigh 400 lbs. The machine I use weighs about 330 lbs, so power to weight would be 42 lbs/ft and 108HP. I wouldn't mind power a bit in excess of these targets.
What I am asking for is recommendations and please be as specific as you can as to what components, manufacturers and suppliers I will need.
Crankcase - stock or ? Crankshaft/bearings/rods Transmission modifications (need close ratio 6 speed) Clutch & drive ratio Cylinders - bore & stroke Power valve or not Cylinder Heads & dome size Pistons Intake Carburetion - filtration Power generation Ignition Lubrication Cooling Exhaust - silencers and anything else you see that I've missed
Main criteria for me is: Reliability - (rebuilds too often makes for an unhappy wife) Parts availability - especially pistons Broad spread of power throughout the rev range - peaky power delivery upsets chassis too much Serviceability Fuel used will be non ethanol pump gas 93 octane
Bike run at sea level
Any recommendations for engine builders would also be appreciated.
Thanks