The internal arrangements of the pumps are similar to the original, but with both the
feed and scavenge pumping gears lengthened by 50%. Therefore the possible pumping capacity
is increased by 50%. It should be noted that the pump will not in itself provide increased
oil pressure, as this is controlled by the oil pressure relief valve, however at low engine
revolutions with a very hot engine an increase in pressure may well be noticed.
The body and cover of the pump are manufactured from a high grade (Grade17) Cast Iron, and
machined totally from a bar form of this material. The gears, idler spindle and back plate
are manufactured from EN24T Steel.
The pump requires an early type of drive gear to be fitted, a suitable original part number
being 70-7249. A Triple Cycles manufactured lightened version of this component can be
supplied with the pump, together with matching idler and crankshaft drive gears.
In 2002 the pump was further developed and the detail construction was changed. The body
became three parts. The pumping chambers are now steel with a cast iron dividing plate. This
allows the machining of the components to be more simple and results in a better product. At
this time it was decided to produce a variation of the pump. It had been discovered that a
few race engines, when used at very high revolutions for a long period of time, would
over-oil. On one other race bike it was discovered that a slightly restricted oil cooler
was not passing the full quantity of return oil. To 'work-around' these problems a 'race'
pump was developed. This version uses the full +50% scavenge capacity but a reduced to +30%
An image of a 'new' pump will be added as soon as possible
Copyright © 2000 Philip Pick
Version 0.15 Date June 2006