I have several inverted Saitos, 100 in a UCD and 150 in Yak, both have carb lower than tank. Both run well w/o a Cline. The only problem is fuel can siphon into the carb & flood it if you do not keep the carb all the way closed during fueling and dont open it until just before starting. Out of the box,the Sa's are usually set to rich and its hard to stop the flow until leaned out. I have to remember to shut the carb(throttle stop) before each re-fueling. A Cline does prevent this but its $$$ and makes the engine a little harder to adjust-high end is less sensitive to turns,flat response.