Also, don't consider the Saito 180 fuel consumption the same as the OS 160 when it comes to tank size. The OS only needs a 16 oz tank. Less take off weight and cheaper 15% fuel, more power than the Saito. Tom, you will be very happy with th OS. Most do need a $25 Perry pump because the muffler pressure with Bisson or Slimline or even stock muffler is insufficient to supply the fuel. At least you can put the tank on the CG. I like the pump so much I pump all my big glow engines.