OLD BUT BRAND NEW -STRANGE AIR BLEED CARB. HAS A TAPERED
NEEDLE IN BRASS BLOCK BY FUEL INLET.... SHUT-OFF VALVE???
ALSO I WOULD LIKE TO RUN ENGINE BACKWARDS , IT"S A .51CU
TO PUSH A GRAUPNER CHINOOK 80"SPAN SCALE ULTRA-LITE
I HAVE A THREE BLADE 10X6 STANDARD PROP. ANYONE HAVE
INFO ON EITHER SUBJECT? ALSO HOW ABOUT THE CHINOOK.
PS. CARB HAS HIGH JET/LOW AIR-BLEED. THIS STEEL NEEDLE
HAS A 45 DEGREE BEND FOR TURNING WITH A COMPRESSION
HEX NUT TO LOCK IT ..................... .ENGINE I BELIEVE IS SIMILAR TO
A THUNDERTIGER.

COMO engines are re-branded SuperTigers. If your engine has the front bearing housing bolted on. You can rotate the front housing 90 degrees to the left and it will run backwards just fine.

Your engine, if I remember correctly, doesn't have a removable front bearing housing? So, unless you can find a left handed crank for a ST S51, you are out of luck in getting it to run backwards.

But, you can run a pusher prop. You can buy them at a lot of modeling places.

Your carb sounds like it is a Mark II or III Super Tiger carb and it is referred to as a twin needle carb. The needle with the compression nut is the high speed needle.On the other side of the carb there is the low speed needle in the center area of the throttle arm. This is not an air-bleed carb.

Enjoy,

Jim

good info ,but carb still confusing. the jets h&l make sense but
looks like an air bleed with spring next to venturi . in pusher plane with wing interference & prop that high speed needle aint going to be adjusted while its runnning !!! to lock that needle you use open ended wrench.also. this has pinch bolt to hold carb
plus a steel screw on top that tight to body of carb does not seem to be mechanical stop. o-ring under so carb can be rotated. the fuel inlet is screwed into brass piece that has high speed needle that brass part is held in by two steel screws .
i need a dang digital camera. THIS CARB WAS DESIGNED
BY MORONS it would be easier to adjust ducati desmodronic poppet valves (motorcycle) than this thing.
ps. i think this engine was produced in the 70"s
thanks w8ye for your time !!!! ------------------------------- see me on the slopes if the
winds are strong

You don't need to send us a picture. You have described the older model SuperTiger carb perfectly.

The tight screw on the body of the carb holds the barrel of the carb inside the body. There's a spring inside there that holds the carb barrel against the retaining screw.

The two tiny screws on the High speed needle side hold the spray bar assembly in the carb and enables you to adjust the spray bar angle to get proper midrange mixture control..

The screw with the spring around it is to adjust the minimum position of the throttle barrel.

The high speed needle with the pinch nut on it is adjustable while the engine is running. You do not tighten the friction on the pinch nut so tight that you cannot turn the needle valve by hand. You just have it tight enough so that it will not change it's setting while the engine is running.

Do a search on Super Tiger and you'll find how to adjust these carbs in many places.

Enjoy,

Jim