Arai Helmets TDR DUCT-2 Tillotson HW-27A it simplifies trackside tuning and

it simplifies trackside tuning and saves valuable space in your toolbox

and includes the piston and associated ring to fit in engines that have been bored and adjusted to 53

or from Rotax

Throttle Cable Assembly for Rotax Max Evo Engines

but once installed it is quite solid

Arai Helmets TDR DUCT-2 Tillotson HW-27A it simplifies trackside tuning andThe Arai TDR DUCT 2 Top Rear Exhaust Vent Set is designed to improve the airflow and overall performance of your Arai CK 6, SK 6, or GP 7 helmet. These clear vents seamlessly blend into any helmet design, or they can be painted for a custom look. Perfect for replacing damaged rear ducts, they help maintain optimal ventilation and keep your helmet in top condition. Each set comes ready for easy installation, ensuring your helmet continues to deliver