Im not sure you ppl remember i did ask for tip here to build a 86" JD stroker engine 5 months ago. Now i have ride the bike for over 5000 kilometers or 3100 miles and it works as a clock.
There is some options to be adjusted and tuned for top performance infor the comming (personal) speed record attempt this winter (125 miles per hour is the goal).
If any one knows the top speed record for Harley JD please inform me.
Some calculation are needed to be done before the tuning can start.
First i will check all tollerances and add new piston rings and serve the valves. If all is ok i will find out the compressions ratio and check up the cam timing and duration as well as ignition. Then its time for the trim and tune job.
For the controll of all data and perform the jetting job i will use fuel/air messurment by lambda sond and a mapping device, LM-2 Digital Air/Fuel (Dual 2 Channel O2). Later i will construct and build a permanent test and tune mapping device for this vintage race bike as well as Harley fuel injection system.
Stuff to do:
* I have been riding over 5000 kilometers since june 2011 on half throttle only so i will start with open up 100% and execute a professinal final jetting.
*Higher compression by taking away the stroke plates used during the "ride in period".
* Optimize the magneto.
* Increase the fuel octan by special additives.
It will be very interesting to experiemt with the drive ratio and tier set up and find out the top speed.
The Final Drive Ratio
The formula can be expressed as (T/E)*(W/C), where T is Transmission sprocket circumference, E is Engine sprocket circumference, W is rear Wheel circumference and C is Countershaft circumference. Each circumference is measured in sprocket or pulley teeth.
Given a typical setup, the stock configuration is usually very near 1.5 for the primary, and around 2.2 for the secondary. The FDR for a stock bike might be around 3.3. But wait a minute, im running a stroker motor. Now, these numbers are highly general, and depend on lots of factors, not least of which is the diameter of your rear wheel.
My engine is very powerfull at low rev so ill guess these figures and calculatons will not really siute my optimal set up. But its a good start. I will order special made sprockets in alumnium with varios calculated ratio.
Follow the procedur and later the final results during this winter on my blog http://thepowerslidingsidecar.blogspot.com/.