Ok guys, I have read everything here on the powervalve issues folks have been having. What has not been answered, at least clearly for me, is what would the effects of opening the valve sooner or later do?
On the road or in fast trails with my '10 300, I sometimes get a slight sag in the power delivery just as the valve starts to open. I thought it was jetting related, and it does seem to change very slightly for better or worse depending upon what needle and clip position is currently in the carb. The "sag" happens mostly in higher gears, 4-6th, and especially on the pavement.
After reading through all of the posts on here about the way the valve operates, I am starting to believe that my powervalve is opening a touch too soon, causing the sag. When the engine does hit, the hit is smooth. The sag is present on both ignition maps as well.
I bought some side cover gaskets and water pump gaskets to check the free play as GMP and others suggested, but beyond that, I am ready and willing to experiment with different thickness shims but I need to know how it works. Does adding shims and preloading the spring help open the valve sooner or does it keep the valve from opening until later?
I wanted to tune for slightly more power on the bottom end, and a softer hit once the valve opens. I have also read conflicting statements that opening the valve sooner gave the engine more bottom end, vs. some statements that said the bottom end was weaker. Some other statements I've read mentioned that by delaying the opening the bike produced better woods type power but the hit on top was really pronounced.
Anyone experiment with this?
On the road or in fast trails with my '10 300, I sometimes get a slight sag in the power delivery just as the valve starts to open. I thought it was jetting related, and it does seem to change very slightly for better or worse depending upon what needle and clip position is currently in the carb. The "sag" happens mostly in higher gears, 4-6th, and especially on the pavement.
After reading through all of the posts on here about the way the valve operates, I am starting to believe that my powervalve is opening a touch too soon, causing the sag. When the engine does hit, the hit is smooth. The sag is present on both ignition maps as well.
I bought some side cover gaskets and water pump gaskets to check the free play as GMP and others suggested, but beyond that, I am ready and willing to experiment with different thickness shims but I need to know how it works. Does adding shims and preloading the spring help open the valve sooner or does it keep the valve from opening until later?
I wanted to tune for slightly more power on the bottom end, and a softer hit once the valve opens. I have also read conflicting statements that opening the valve sooner gave the engine more bottom end, vs. some statements that said the bottom end was weaker. Some other statements I've read mentioned that by delaying the opening the bike produced better woods type power but the hit on top was really pronounced.
Anyone experiment with this?
