Engine and Drive Train Parts

The footprint is patterned on the later crankcase design but with a little judicious use of a file can be shaped to suit the earlier cases.
To suit the 350cc cylinder head.
An alloy barrel results in greater efficiency in cooling as well as looking rather more impressive than the standard iron part.
Bare casting £210

Sand-cast in LM25 aluminium.
This is to fit a forward-facing magneto, thus keeping the sparks away from the carburettor.
Supplied polished but without the 'winged M' being painted.

Sand-cast in LM25 aluminium.
Supplied polished.

Sand-cast in LM25 aluminium.
Available with AJS or Matchless logo.
Can be supplied polished, otherwise as shown.
You will need to drill small breather hole yourself.

To place under the barrel to change the characteristics of your engines' power delivery.
Available in thickness' from 1mm to 15mm.

This cast aluminium spacer makes it easier to fit a roller big-end to any unit single.
For a more homogeneous look with the barrel it has a cast-in fin.
We offer to helicoil your crankcases to accept 10mm studs should they be required.

Suits C15, B25, B40, B44, B50.
A common problem with these engines, especially during the heat of a race, is the poor gear change.
Our solution has been to re-design the selector channels and indexing to give a more positive gear change.
Lazer-cut from stainless steel, this is a straight swap for the original (inferior) item

A new 'horeshoe' chaincase

Complete with oil seal and retainer

1 pair available at this time

An improvement on the original in that the grooves do not open out under duress.
Lazer-cut from 5mm stainless steel, this item requires the gearbox casing to be opened out slightly; achievable through use of a file.

We have cast these covers with a little more depth than standard in order that they will suit BSA and Triumph twin engines and also to suit electronic ignition.

By placing different thickness' of spacer under the barrel the port timing is changed helping you experiment with different power characteristics.
Available in thickness' from 1mm

Head gasket available in copper or aluminium.
Available in thickness' from 0.8mm.

To optimise gearing for trials work various size engine sprockets are used often resulting in slack in the primary chain.
The chain tensioner locates on the two lugs to the rear of the engine sprocket.
On engine types Dl to D7 the pillar bolts allow the outer cover to be fitted using two short fixing screws.