Finally got a chance to try the attex after the 4stroke conversion. Had a question though. I knew it would loose the top end the 2 stroke had but I'm wondering if I need to change the spring on the t20? I have read on here about people switching to a red spring. What will switching to the red spring give me? I put a 16hp honda clone and runs great besides the governor limiting the throttle which i'm fine with. The other thing I have noticed is if I take off from a dead stop and let everything whined out it runs good but if I let off and get back on it there is no top end. What could this possibly be? thanks.