if it makes it easyer to start its worth it , hope it does the job.i did feel it in the arm the next day lol.took a while to get it goin as i had the ignition battery plugged in the wrong way(oops)but once that was sorted it fired up prety easly.used the recomended settings on the carby and away she went.i didnt have any fule and got a tank of a mate who was usin it on his 3w (synthetic also)and no probs