Go look at this post from Pianori on the bottom of the page. He talks about some upgrades he did to his SPE 40. I did some of the same things he did and the results were fantastic. I am now looking for a little more power so might be replacing the rings with Bowman High Compression Rings. Hope this helps. Sorry about the bad servo advice.


http://www.rcuniverse.com/forum/m_47...tm.htm#4765822