Adjustable Idle Speed Screw for Tillotson Carburetors

Fine-tune those crucial idle settings effortlessly—the TISS screw (SKU: TISS) threads into Tillotson carburetors to set optimal RPM, avoiding surges or drops that disrupt your race flow.

• Robust construction for repeated adjustments
• Helps achieve smooth transitions to full throttle
• Essential for maintaining engine health over long sessions

With reliable idle control, your kart stays organized at the grid, ready to launch without hesitation for that early lead advantage.

Frequently Asked Questions

Q: How do I know if my Tillotson carburetor is compatible with this idle speed screw?

A: This screw is designed for standard Tillotson carburetor bodies that utilize a threaded idle adjustment port. It is a universal fit for most racing-spec Tillotson units, but please verify your carburetor model has a matching thread pitch before installation.

Q: What is the best way to set my idle speed using this screw?

A: With the engine at operating temperature, turn the screw clockwise to increase the idle RPM or counter-clockwise to decrease it. Adjust in small increments until the engine maintains a steady, consistent idle without engaging the clutch prematurely.

Q: Should I use any thread locker on the idle speed screw?

A: Generally, no. The screw is designed to hold its position through tension. If you find the screw is vibrating out of adjustment due to engine harmonics, ensure the spring tension is adequate, but avoid permanent thread lockers that would prevent future trackside adjustments.

Q: How often should I replace my idle speed screw?

A: You should inspect the screw during your routine carburetor rebuilds. If the threads appear worn, the tip is flattened, or the adjustment feels "loose" or inconsistent, it is time to replace it to ensure precise tuning.

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