56SR Throttle Barrel Retainer Screw - YS Engine YSS2026  [YSS2026]

Retainer screw function

The YS Engine YSS2026 part functions as a throttle barrel retainer for 56SR barrels, preventing axial movement so the barrel keeps even rotation and alignment during idle and throttle changes.

The inclusion of 56SR in the product name indicates intended fitment; install this retainer only where 56SR-compatible parts are required. It should not be used as a universal fix for other carburettor types without confirmation of compatibility.

To fit: remove the throttle barrel assembly, align the barrel in its correct running position, insert and thread the retainer screw until it secures the barrel while allowing free rotation, then recheck movement across the throttle range. Avoid overtightening to prevent binding or thread damage.

In practical tuning work the retainer helps keep throttle response consistent by eliminating unwanted barrel play that can affect idle stability. It is a maintenance replacement and will not modify carburettor calibration by itself.