What should I set the Pilot Jet Setting at Sea Level

Grok States:  

For a 2021 Tao Tao TBR7 with a 30mm Mikuni clone carburetor, stock exhaust, and foam open air cleaner at sea level, the pilot jet setting is typically recommended to be a #25 pilot jet. This is based on advice for stock TBR7 bikes at sea level, though slight adjustments might be needed depending on your specific setup and conditions. 

You may need to fine-tune the air-fuel mixture screw (usually starting at 1.5–2 turns out) and monitor plug color or performance to ensure optimal running. If you experience lean or rich conditions (e.g., hesitation or bogging), consider testing a #22.5 or #27.5 pilot jet and adjust accordingly. Always verify with a plug chop or consult a local mechanic for precise tuning.

Further Thoughts from Grok:

Glad you settled on the #22.5 pilot jet for your 2021 Tao Tao TBR7! Since you’re looking to adjust the air-fuel mixture and confirmed the mixture screw is on the fuel side of the 30mm Mikuni clone carburetor, here’s how to proceed at sea level with your stock exhaust and foam open air cleaner:

The fuel mixture screw (typically on the engine side of the carb, accessible without removing it) controls the fuel flow for idle and low throttle. Since you suspect it’s too rich (likely indicated by symptoms like black spark plugs, rough idle, or excessive exhaust smoke), you’ll want to lean it out.

1. Locate the Screw: Find the fuel mixture screw on the carburetor’s fuel side (often a small flathead screw near the carb’s base).
2. Baseline Setting: Start with the screw at 1.5 turns out from fully seated (turn clockwise until gently seated, then back out 1.5 turns). This is a common starting point for Mikuni clones.
3. Fine-Tune:
   • Warm up the engine to operating temperature.
   • With the bike idling, turn the screw in (clockwise) in small increments (e.g., 1/8 or 1/4 turn) to reduce fuel flow, pausing to observe idle smoothness and response.
   • If the idle speeds up, you’re leaning it correctly. Aim for the highest stable idle speed, then adjust the idle screw (if separate) to bring the idle back to normal (~1,400–1,600 RPM for the TBR7).
   • If the bike stalls or idles poorly when turning in, you’ve gone too lean—back the screw out slightly.
4. Test Range: Most TBR7s with a #22.5 pilot jet run well with the fuel screw between 1 to 2.5 turns out. If you’re beyond 2.5 turns and it’s still rich, you might need a smaller pilot jet (e.g., #20), but since #22.5 is working, focus on the screw first.
5. Verify: After adjusting, ride at low throttle to check for hesitation or surging (lean) or bogging (rich). Check the spark plug after a ride—it should be tan, not black (rich) or white (lean).

If symptoms persist (e.g., still rich after reaching 1 turn out), double-check for other issues like a clogged air filter, float height, or needle valve wear, as these can mimic mixture problems. Let me know how it runs after tweaking or if you need help with other carb settings!

Torque Specifications and Other Technical Data

  Torque wrench is very Necessary for the TBR7. Don't strip important bolts

Front Axle                : 35 ft/lbs - 47 Nm

Rear Axle                  : 35 ft/lbs - 47 nm

Front Caliper Bolts   : 22 ft/lbs - 30 Nm

Rear Caliper Bolts    : 22 ft/lbs - 30 Nm

Spark Plug                :8.7 ft/lbs - 12 Nm

Oil Plug                    : 10 ft/lbs  - 14Nm (24mm Socket)

Lower Fork Pinch Bolts: 25 ft/lbs - 34 Nm

Upper Fork Pinch Bolts: 17 ft/lbs - 23 Nm

Triple Tree Nut: 50 ft/lbs - 68 Nm (32mm Socket)

Head Bolts: First stage 12 to 14 ft/lbs - Second Stage 25 ft/lbs

Most body bolts are 10 to 15 ft/lbs - 14 Nm to 20 Nm

Other Specs: 

Compression of motor should be 180 to  200 psi for top  performance, 150 to 180 psi is good performance, 120 to 149 psi and it will run. Under 119 psi wont run.     

Air Fuel Mixture Screw - What a Screw! (Does not apply to Nibbi Carburetors)

Air fuel mixture screw helps you dial in the perfect "purr" for your idling beast. When tuned right the Tao Tao TBR7 Purrs like a bobcat. 

This is where the adventure begins. You found the right pilot jet (your idle) but she sounds a bit tight or lulls. So you want to adjust the air fuel mixture?. You realize on the Chinese bikes and Chinese clone carburetors you can not access the dang air fuel mixture screw without removing the carb... Ahhhhhhhhhhhhh

Of course I consult the all knowing oracle known as Google and come up with an extended air fuel mixture screw. Yep it does work! Because it is plastic I am a bit nervous with it. But it has been 1 month and serves me well. I live at sea level and travel up and down a few mountains. The air fuel mixture screw gets used at about 800 feet up. There are observation posts on many of our NY mountains, so I do climb a bit of altitude. 

I did not use the above new spring as it was too long. I used the original spring that came with my new

Chinese Mikuni Clone carburetor. The original carburetor was sealed. The new carburetor I fitted with a 22.5 mm pilot jet and a 105 mm main jet. 

You only have to take off the carburetor once for the air fuel mixture. Once installed you can reach the and turn the dial without carburetor removal. The numbers are nice to know how far you turned the knob. 

I put the washer on top of the spring and then the seal on top of the washer. Insert and screw all the way in, GENTLY! Then bring out a turn and a half. From there adjust accordingly. Clockwise is less fuel and counter clockwise is more fuel added to the air fuel mixture. Really effects your idling range and throttle closed circumstances.

Click Here To Get  An Extended Air\Fuel Mixture Screw

Here is a great video! Not mine but covers all the basis!