Pre Unit Triumph 4 speed gearbox rebuild kit 500 650Rebuilding a pre unit 4 speed gearbox may not be too hard, but getting all the correct wear parts together sometimes is . After rebuilding these gearboxes for years, I finally put together a kit of all the commonly replaced parts. This kit has most everything you need to get your Triumph pre unit four speed gearbox back into shape. This is for gearboxes from 1950 1960, which have bronze bushings to support the layshaft. If your pre unit gearbox has

and then can be delicately finished with a ball hone

71-4619 (10 bolt composite)

6 rocker oil feed copper washers (82-1880 or F1880 )

#25 pilot jet

Replace your old warped and leaking Monobloc float bowl cover with this brand new one from Amal

Rebuilding a 5 speed gearbox may be pretty straight forward

A bent or worn needle can cause erratic performance

No curing or setting time is required

The 1/2" radius has a larger surface which can help correct errors in rocker geometry

and lots of other small engines

Choose from the drop down menu to pick which gasket you need

MADE IN USA BY CLEVELAND GASKET