The T140 uses a 360-degree, air-cooled parallel twin layout.
Gear driven camshafts operate a single inlet and exhaust valve in each cylinder via pushrods.
Twin Amal carburettors supply the cylinders with fuel/air mixture through short intake manifolds.
The crankshaft drives the clutch through a triplex chain operating in an oil bath.
Starting is by kick start with later versions having electric start.

The engine oil system is of the dry sump type, a combined pressure and scavenge oil pump is driven by the inlet camshaft gear, later versions of the T140 employed additional integral non-return valves to prevent oil draining into the sump.
The frame of the T140 serves as the engine oil reservoir.
The T140 uses a 360-degree, air-cooled parallel twin layout. Gear driven camshafts operate a single inlet and exhaust valve in each cylinder via pushrods. Twin Amal carburettors supply the cylinders with fuel/air mixture through short intake manifolds. The crankshaft drives the clutch through a triplex chain operating in an oil bath. Starting is by kick start with later versions having electric start.
The engine oil system is of the dry sump type, a combined pressure and scavenge oil pump is driven by the inlet camshaft gear, later versions of the T140 employed additional integral non-return valves to prevent oil draining into the sump. The frame of the T140 serves as the engine oil reservoir.
Triumph Bonneville T140