pe reivers ; I checked out your website regarding the Ryobi hop-up, it is just what I was looking for to get me started. You have definitely sped up the learning curve. I intend to utilize the modified carb with the large reed design as exampled on your site, but have a few questions. The large reed that is displayed, was it pirated from another type engine or is it something you constructed. If you made it , where would I look to find suitable material for making a reed. Please remember I`m just getting started in this 2cycle world and this is all new to me. Sadly I was unable to access the cad download dealing with compression and porting changes. My Microsoft program keeps telling me that the file was coded wrong upon entry. But I tend to think it may be my ineptness with the computer rather than a wrong code. Nonetheless I was able to find a couple of websites that briefly dealt with the subject. I have access to a mill and a lathe which will allow me to make many of the changes desired. My intention is to mill 30/thou. off the crankcase to increase compression . Could you please outline the modifications necessary to the piston to retain port timing? I also measured the reed retainer to crank pin distance and can mill 80 thou. from the crankcase to decrease the case volume ( stuffing I believe it`s called). Do you have any tips or words of caution regarding my intended actions before I start cutting things up. Thanks for your help the information that you have made available is enlightening.