is it a good idea to mix the gas/oil manually or is it ok to use the tank? I've heard both. What do you blaster owners think?

Get the oil-block off kit from vitos, its so much better to mix the gas, trust me and everybody else who posts, its worth the 25 smackers

block it off and mix it manually, alot more reliable depending if you mix your gas before you open the beer

I haven't had any problems yet, but I plan on blocking it off soon on my wife's bike. I heard you can get block off kits from Yamaha for like $10.

ours works fine so far....but we have the block of kit ready to install so change it, you will thank yourself