speed-o verses gps, ocean slut thinks its the gas fuel filter most likely that is it but will not know till it get's warmer so a few month's will tell then working on the ski in garage while it is winter, here in nashville tn.
Well if you are using the speedo they are highly inacurate and can very 10 miles easily. GPS is a better gage for actual speed. Check your fuel pick ups too. I had a little trash in mine, switched to reserve and ran fine.