i have been using my blaster to haul my friends around the area and through the fields, with 2 of us on there the blaster shocks are almost pressed in all the way , im 162lbs and hes 178lbs or so , can i upgrade to a more stiff suspension ?
none of the above are stiffer than the stock blaster shock, yours is prolly blown from the gang bang you've been having on them
a newer stock shock is prolly your best option
Not advised ...I believe the stock max weight that Yamaha lists for the Blaster is 220 lbs . That means at 340 you are overloading it by 120 lbs or the weight of a small 3rd person ! The guy I got my Blaster from was 200 lbs, the shocks were blown and springs were sacked .