Bonneville special: Jenks Aluminium power velocity stack

Next week’s issue of MCN is out fiftieth anniversary celebration of the Bonneville, and to get you in the mood we’ve got a selection of Bonneville related cool products.

This is Jenks’ spun Aluminium Velocity Stack designed to provide optimum air flow into the airbox used on the Bonneville, Thruxton and Scrambler.

The shape is a properly designed tapered cone and the open mouth is protected by a gauze screen.

The spun aluminium stack is bonded to an aluminium back-plate which is riveted on to the inside of a modified stock airbox cover, so fitting is quick and easy  and it looks great.

Velocity Stack is intended to replace the standard rubber inlet snorkel and improve air flow into the airbox, allowing larger main jets to be used with a small increase in power.

Dynamometer tests have shown that the use of a velocity stack and a Unifilter oiled foam airfilter improve inlet airflow and the main jet can be increased in size by five points over simply removing the inlet snorkel: this means, for example, that a 120 main jet can be increased to a 125.

It costs £60.19.

• Save money on Bonneville parts in the MCN Shop