Can you provide me some basic instructions on tuning my smaller (les
than 120 sized) SuperTigre carburetor? To properly set up your carburetor, there are a few steps...
Make sure the spraybar is set so that the fuel slot is pointed straigh down the center of the carburetor. You will have to look through th carb from the bottom, with the venturi opened to full. Loosen the tw screws next to the high-speed needle valve to rotate the spraybar s that the slot is centered.
The idle needle can be seen in the slot of the spraybar. It looks lik a piece of wire that has the end squarely cutoff. It should be less tha one-half way across the slot when the venturi is opened to full.
The high-speed needle should be opened about 2-1/2 to 3 turns out fro closed.
All of these settings are very rich. You'll have to start the engine a about 1/4 to 1/3 throttle. Once the engine starts, advance the throttl to full. You can then lean the high-speed needle until the engine i running just rich of peak RPM.
Once you have the high-speed needle set, you can retard the throttle bit and use the idle needle to adjust the engine. Retard a bit, an adjust. Keep doing this until you have reached the desired idle RPM an mixture. Remember, since we started out with an intentionally-ric setting, the idle mixture will have to be leaned.
Finally, the midrange can be adjusted by rotating the spraybar a hair Just loosen the two screws next to the high-speed needle and rotate th spraybar just a tiny bit. Either direction is OK. This will help you ge a good transition and midrange
-- bgferr
----------------------------------------------------------------------- bgferr1's Profile: