yamaha big 4
New member
hey guys i have been looking through some posts and was wondering what the weak spots are on a viper motor are ? from what i understand the vipers have better porting then the srx motors and a tripple piped viper puts out more ponies then a stock srx so what usually goes on the viper motors first pistons and Cylinders? because of bad jetting? or weak parts? if you where building a motor starting with a set of 02 cases witch are the same for the viper and srx what way would you go srx cranks rods and cylinders or viper crank rods and cylinders it is gonna be a fast trail machine want to be able to compeat with my brothers f-7 thanks for your input guys it is apreciated