Originally Posted by
GMartinez
The sirio has more top end the plus has more bottom
just take your time with the sirio they take a longer time to break in verus the plus & are less durable if you over lean it out since it is the AAC version I would try to keep the temp range after breakin no more than 240
Thanks for the information, I am in desperate need of bottom end, we have tight tracks, what motor will do the trick, off road with on road cranks??