Casting Threads

• Fuel Line input port, in upper casting, has 1/2-20 UNF (SAE) threads
• Fuel Screen Assembly, in upper casting, has 1/2-20 UNF (SAE) threads
• Float Valve, in upper casting, has 1/2-20 UNF (SAE) threads
• Main Hex bolt hole, in upper casting, has 3/8-24 UNF (SAE) threads
• Drain Plug hole, in lower casting, has 3/8-24 UNF (SAE) threads
• Secondary Well hole, in lower casting, has 3/8-24 UNF (SAE) threads
• Carburetor Mounting holes (2 places), in upper casting, has 5/16-18 UNF (SAE) threads
• Gas Adjusting Valve (GAV) hole, in lower casting, has 1/8-27 NPT (Pipe) threads. Use caution not to cut threads deeper, as it is a pipe thread.
• Air Adjust Screw hole, in upper casting, has M5x.75 (Metric) threads
• Main Jet hole, in lower casting, has M5x.75 (Metric) threads
• Cap Jet hole, in lower casting, has M5x.75 (Metric) threads
• Compensator Jet hole, in lower casting, has M5x.75 (Metric) threads
• Idle Jet hole, in upper casting, has M5x.75 (Metric) threads
• 5/16-18 and 3/8-24 threads which are stripped can be repaired. See Heli-Coil Thread Repair Kits and Installing Heli-Coils
• Idle Jet, tapped hole, must provide for taper fit.

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