We pulled the cylinder a few times, modified the ports to the current level testing each increment of port changes.  We installed and tested the HPR/V2 reed assembly and also installed a TM 38 Mikuni bored to 41.5mm. 


After getting the ports in the ballpark for this stage of testing, we stated our LT 250 pipe development process.  We are showing the graph of what we are calling HPR Test Pipe # 1.  The pipe has more Peak power than the other pipes but it is not acceptable to us because we believe we can develop the pipe and ports to produce a wider power band with as much or more peak power and still make it produce more power in the mid and lower RPM range.

 It takes time to develop a pipe and port package.  Stay tuned for updates:

Blue line is DR Q / Shearer pipe and silencer
Red line is HPR test pipe # 1 pipe and silencer
Green line is Paul Turner pipe and silencer