captinjohn.... Your custom reed valve looks very interesting but what effect does it have in performance of the Ryobi motor when compared to the stock reed valve?? Is there an improvement?? Do you have some data?

It's not enough to theorize configuration changes that may improve performance and declare them as valid. One has to demonstrate that the theory works in practice. You must MEASURE the performance with the two configurations to see what the effect is. Obviously if there is no improvement in performance, or some other tangible operational benefit, then it's not worth the effort to modify the stock set up.

diceco

PS. After writing the note above I discovered that the photos of the reed valve set up you included in your post #366 are not yours. They are pereivers. Furthermore pereivers, in his performance table on his referenced web page, does not show a direct comparison, using the same prop, of the stock reed and his modified reed valve.