the reason i began to look at the shaving of the power valves came after asking the doo peopole if they could change the opening by reprogramming the opening rpm.
answer was yes and only as early as 5800.
same rpm the series 3 motor opened and there is a big difference in how the two pull in the midrange.
when you look at the series 3 exhaust opening you can see the boost ports are not plugged off and the exhaust opening with the guilletines closed has a 30mm opening.
a comparision to the r exhaust port shows the boost ports completely blocked off and the main exhaust port opening now at 25mm.
why i asks . doesnt really matter but allows them some sound advantage in sensitive areas .a big issue ,today
with out the flow the pipe comes to pressure latter
with it , it begins to work sooner and produces a stronger intake signal , which inturns is felt at the throttle as a engine coming to life sooner .
yes you could open it to soon , but following what doo has done previously seemed to be all we were interested in.
had done it to theh point of seeing what was to much.
first thing i tried was pulling the two round barrels out and seeing how it liked that , it didnt , hahaha ya have to push it both ways to see i say , in order to find the middle ground.
reason why i stopped at 200 ths . , gave enough of a noticable difference with out any issues . making a stronger vaccum signal , when working with 2 strokes is what we mainily try to achieve in order to make power.
were it was missing on the r motor was mid range .
is easier to clutch when they are stronger and have a longer power curve to work with .
hadnt been saying anything about this but some one on here blabbed about one i did for them , told them it was just experimental , you know how it goes .
07 rave valves are made of a lot softer material and they changed what the 08 was made of and so it is why they have different numbers .07 ones were breaking. can really hear the difference when cutting them on the mill.
