250 OR 290 EVO

[liviob]

If you want the power of the 290 to be a tiny bit softer and noticably more flexible between 1/4 throttle to below idle add a set of Boyeson pro series reeds. part number 112. They will smooth the bottom power. They are dual stage reeds with the top reed being as thin as the stock reed and the bottm reed being thicker than the top reed. In effect at small throttle settings the thinner top reed opens exposing a smaller intake opening in the thick bottom reed softening and smoothing the power until you open the throttle big enough to open the thicker bottom reed. Then the motor feels like a stock 290.

Edited December 13, 2010 by Liviob

[nigel dabster]

If you want the power of the 290 to be a tiny bit softer and noticably more flexible between 1/4 throttle to below idle add a set of Boyeson pro series reeds. part number 112. They will smooth the bottom power. They are dual stage reeds with the top reed being as thin as the stock reed and the bottm reed being thicker than the top reed. In effect at small throttle settings the thinner top reed opens exposing a smaller intake opening in the thick bottom reed softening and smoothing the power until you open the throttle big enough to open the thicker bottom reed. Then the motor feels like a stock 290.

thought they were 665?

[liviob]

thought they were 665?

665 is the power reed. I have not used that reed so i dont know how it works. I was told by the Boyeson tech that the pro reed 112 would offer better bottom response due to the thinner top pettel. If you need more bottom power add their KX 85 Pw 43 power wing. I use this combo at high altitude with 250 lb rider. It works very good.

[copemech]

665 is the power reed. I have not used that reed so i dont know how it works. I was told by the Boyeson tech that the pro reed 112 would offer better bottom response due to the thinner top pettel. If you need more bottom power add their KX 85 Pw 43 power wing. I use this combo at high altitude with 250 lb rider. It works very good.

Liveob, the thing about the reeds seems to me to be all sort of a balance of properties you desire. It all seems a trade off, but typically the 665 powerreeds have been the ones used, which are designed to sharpen up the mid and top end resopnse at the sacrifice of the lower end, net yield a smoothing effect on the bottom end of the range softening the response and such on a rippy motor. It is all up to the operator, ad at altitude yours may well vary from those at or nearer sea level.

[liviob]

Yes, that is what the Boyeson tech said about the 665 reeds. Being an intermediate rider I did not feel that i needed more response or power from the motor at higher rev's. At the time i purchased the 112 reeds I was looking for a more flexible, more controllable, torqier bottom power. I was stalling the motor often at 8000' Elevation. The 112 reeds delivered. No more stalling the motor and amazing flexability. You can pull the motor down below idle so far that you can count the pops and it will pull back up with a greater amount of control when you ask it too. At the time I was not using the clutch to it's fullest because it was more like a light switch. After the Dan Williams mod the clutch is now very usable and works as it should. I still do not need more power in the upper rev's, but I'm curious to know how the 665 reed feels during real time use. Thanks Copemech

Edited December 15, 2010 by Liviob