Scale Wendell Hostetler 30% Piper Cherokee Glass Fuselage Build.

[TonyHallo]

The Siato FG61TS has a funky Walbro WYD carburetor from the factory. It has the typical Walbro features such as the pump and diaphragm but the venturi looks more like a Fox 60 carb with a spray bar. There is no choke, to prime the engine the plan is to screw a long rod into the barrel and pull barrel open, this opens the spray bar. This operation is done through the cowl. Once primed the rod is removed and you start the engine. The instructions recommend that you simply start the engine with an electric starter and don't worry about priming. The problem is I sold my my electric starter in 1992! Morris Mini Motors offers a conversion kit to a Walbro WT 962 carb. Been looking for a lathe/ mill project so I bought a knock off WT 962 to do the mock up. The bore on the WYD carb is .410 while the WT962 is 13 mm or a 1/2". The bolt spacing is the same however the pulse pressure port is clocked differently. Decided to whittle out a new insulating space out of 3/8" G10, the existing is either G10 or micarta, both have similar thermal properties. Even get to use the rotary table. The kit from Morris is about $120 and at the end of the day I will have about $80 in the project but look at the fun.

 

[TonyHallo]

The insulator is done. I glued the first one onto a piece of aluminum, when completed I was unable to break the bond, I used thin CA and probably too much, soaked it in acetone for over a hour. The second one in the photo was glued onto a piece of 1/4" plywood four small dots of medium CA, it came off after soaking in acetone. Lesson learned. I have a genuine Walbro WT carb and correct size velocity tube on order. I plan to remove the intake assembly and port match it to the new insulator. Could have just bought the kit or modified the stock insulator but this was a fun project.