great, my kind of post. i have built more 47 and 48mm stroker crank motors than i can count. my son raced a 47 stroke by 54 bore for 2 years and now runs a 48 stroke crank with a 54 cylinder. the stroker motors are very reliable. you really need to run them with the 54mm cylinder. most 50 and 52mm cylinders are short cylinders and you would have to use a spacer plate to make it work then your port timing will be off bad. also a 47 will fit the cases with no modifications but to use a 48 you have to cut the cases or the rod hits. i do this with a dremel tool. alos to answer your question the 47 and 48 stroker motors are a lot stronger than a 45 stroke. the 45 came from the old dinlis, for a couple of years they came stock with a 45mm crank and were over 90cc which actually made them illegal to be sold to kids under 16 to ride. i have my sons 05 eton with a 110cc stroker in it for sale. the 110cc is the 48 stroke crank with a 54mm cylinder.
Mark
" A good friend will bail you out of jail but a true friend will be sitting beside you saying.... Dang that was fun"
Mark
Bubba ( son )
2005 YFZ450, 08 motor,Bike cam, Laeger Plus 2 a-arms, Elka shocks, GYTR Exhaust, Holeshots on Baja rims, AC Pro Pegs, G- Force axle
2009 Sponsor: Asv, SixSixOne. Oneal Racing, Houser Racing, GT Thunder, Nacs Racing, Elka