For you guys using the Cline bear in mind where this gadget was originally used. The Cline is simply a component from a Walbro gasoline carb and as luck would have it is also one of THE most critical adjustments on a gasser. The adjustment is made by bending the lever to reduce or raise it's height, thus changing it's opening and closing characteristics in relation to engine fuel demand.

I have 2 1.60's and both have Clines, one ran great right off the bat and the other had the annoying richness in the midrange. Dissasembly of both Clines revealed that the lever on the rough running engine was set way too high and was allowing the Cline to open early and open much further which was slamming the engine with too much fuel in the midrange. This makes sense when you think about it because the low end is set by the low speed needle and the high end is set by the high end needle. The midrange has a point in the transition where the carb stops being metered by the low needle and the spray bar is in effect at wide open. If the Cline is flowing too much fuel at this point the engine goes rich and we get that annoying gurgle. You really don't notice it on the ground when slamming the carb from idle to full open because you transition through the range so fast the engine doesn't have the time to load up. The problem is that once you take off you don't throttle the engine that fast and we do most of our flying at around half throttle, right where the over rich condition occurs.

The solution I found was to try bending the lever down, slightly below the level of the plastic housing side of the Cline. Cline's instructions state that the lever should be level with the flat part of the housing it sits in but I found that it needs to be a bit lower. If you get it too low the regulator will not open at all so test it by scucking air through the regulator to be sure it's working before you put it back on the plane.

I was amazed at the difference in performance that just a snall bend in the lever would provide. Bending it down leans the total fuel flow and up richens it.

Oh and before anyone asks...

I run Morgan 5% fule, OS 8 plugs, Bisson BGX mufler and a MenzS 18 x 6 prop. My Cline is installed between the HS Needle and the carb, medium tubing and the Cline check valve.