try the mikuni with the stock intake and perf reeds..the koso style intake is too large for a 50 and border line for a 70...you loose all of your velocity....air flow has to be accompanied by velocity or you dont get a gain...
Proud DAD of Cam Covil #8
2011-team Mushin/JB racing/FMF. 90 mod atva
2010- dcmx amateur champ
2009-dcmx quad youth and quad blaster champ,85 cc 7-11 B 3rd place,Loretta lynns's 2 nd overall 90 mod
2008-dcmx quad blaster champ,loretta lynns's 1st overall 90 mod
8 time dcmx class champ,06 atva national champ,1st place orange crush and big buck gncc
09 gncc river ranch winner.