This is a ball bearing tipped 5-speed gearbox camplate detent plunger.  The ball bearing sits in an accurately machined socket which allows it to rotate while the cam plate is rotating when changing gear.  This is designed to reduce and minimise the friction between it and the camplate.

The idea is to make gear changing a little bit smoother as well as making neutral potentially easier to find - especially on the later LH change engines.

I have one of these fitted to my T140, T150, TR65 and R3.  It is a direct replacement for the standard 5-speed plunger and is fitted by undoing the plunger housing, swapping the plunger and screwing the housing complete back in.  Simples!  It works with both the early (round) and later (cut-back) camplates.  I know because I have both types in my bikes!

Please note that a variety of different plunger housings can be fitted and it is therefore important to check - see housing pictures.  This item is 51.5mm long and is suitable for the plunger housings illustrated.  However, if you find on inspection that you need an alternative length (I also have 40mm and 43.5mm) then I am happy to swap it for you.

On installation, I have found that by reducing the plunger spring length by up to 10mm (see picture) further improvements to the feel of the gearbox operation can be had.  With the reduced friction of the ball roller, the plunger can quite easily locate into the detent position.  It is also the case that neutral is potentially easier to find with this set-up too.

If you have ANY questions then please just ask.  I always leave feedback when I know the package has arrived safely.  I am happy to combine postage for multiple items.

N.B.  UK postage is 1st Class signed for.

This auction is for the ball tipped plunger ONLY.