2006 15f whats the best impeller for the riva rpm kit

[wave15stx]

i have a 2006 15f with the rogue big air intake,now im looking to order the ride plate,exhaust,and the impeller but should i stick with the one riva offers 14/21 or is there a better one?i dodnt want to loose any down bottom is this a problem with the 14/21?

[racingtrx450]

i currently have the 14/21 on mine. i have a little more into the motor and its still too tall. im told 13.5/21 is perfect for my set up and 13/20 is perfect for riva set up. today im ordering a repitched impeller from impros to get rpms up right now im only at about 74-7600. i suggest uying and repitching from impros

[H2OPROOF]

I agree. I have the 13/20 from Impros and love it.

Jason

[wave15stx]

whats the stock size?13/20 will give u all around better performance and more rpm?

[racingtrx450]

stock is 13/19 i believe, 13/20 is a bit more aggressive then stock. together with the aftermarket design and more pitch with mods will bring you back to the correct rpm and give you speed and hopefully some acceleration too.

[wave15stx]

thanks alot for the info,is the 14/21 hurtin you down bottom?

[racingtrx450]

actually im surprised my bottom end isnt worse. kawi made a strong engine through the power band. but my bottom end isnt to bad. my top end is what ive noticed most. to tell you the truth ive had the 14/21 so long i could be down on bottom end and dont even know it. but id say it must be hurting me a bit.