Throttle and fuel adjustment screw locations for an Aisin Carburetor on an '88 Toyota pickup 22R
Throttle: ~ 3 1/2 turns
Fuel Mixture: ~ 2 1/2 turns
The throttle screw is location on the passenger's side on the rear of the carburetor (near the top).
The fuel mixture screw is also located on the passenger's side. However, it's more difficult to locate as it is set back into the housing of the carb, near the bottom.
The throttle screw can take a flat or phillips head.
The fuel mixture requires a flat head of a specific size.
After setting default throttle and fuel positions, you will want to tune your carb according to your elevation.
Note: carburetors use natural atmospheric pressure in regards to supplying fuel to the intake manifold. Different elevations experience different levels of pressure in the atmosphere. This can have a minute but drastic effects on your engine's performance and efficiency.
I personally like to adjust my throttle to roughly 700-750 rpm (22r motor) and I'll then run it for at least 300 miles. I'll then check my spark plugs (best if brand new) and inspect for lean or rich conditions.
From there, tune as needed.
Hope this help. Good luck!
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Engine: 22R - Stock Aisin Carburator
Vehicle: '88 Toyota Pickup - 2WD
Website: [ Ссылка ]
