Thanks Peg, not sure who made the Alloy/Nikasil barrels but the bike came with a spare set so I will check.
Yes, it is a Morgo pump. Is priming a simple matter of kicking it over with the ignition off?
If you ever get the urge to sell the extra barrels, I will buy them from you without hesitation.
Priming the Morgo rotary pump is much simpler than just kicking it over with the ignition off
First mark the position of your ignition pickups, then remove them.
Remove the timing cover.
Refilling the oil tank.
There is a small bleed screw with a locking tab.
Remove the screw and wait until only oil dribbles from the hole (no more air bubbles).
Judge whether the lock tab is reusable, and refit screw with original or new tab.
Replace timing cover gasket and check or replace timing cover and crankshaft oil seal (there are some nasty cheap replacement seals that are to be avoided, seals made by Pioneer Western have a reputation for quality and reliability).
Refit timing cover.
Refit ignition pickup in the orientation that you had previously marked.
Kick the engine over (ignition off) and verify oil flow using;
a) Oil pressure gauge-40 psi within a couple of kicks is normal with this uprated pump.
b) Check oil pressure light goes out within a couple of kicks.
c) Remove oil pressure sender unit and check oil squirts out of the port- refit carefully without managing to crack the case.
If all is OK, start the engine and check the ignition timing with a strobe lamp.
I told you it was simple
I believe the rotary pump was designed originally for early bikes with an oil tank that retained the oil above the level of the pump, so there was always oil in the supply pipe to retain the pump prime.
The oil in frame tank falls below the level of the pump, so the supply pipe drains back and pump prime is lost.
Within the pump there is a check valve to prevent wet sumping, this is why the pump will not flow oil to automatically prime itself.
The good news is that you can avoid most of the above, by clamping the inlet hose before you change the oil. However the pressure checks are still essential after refilling.
Failing to ensure the pump is flowing oil before starting will result in a destroyed engine, the pump will not self prime no matter how long you run it and however many revs you give it.
Even with this protracted endeavour, I would personally favour the rotary pump over what I consider the barely adequate but easy to live with self priming original plunger pump, especially living in the city.
Others might disagree with me and prefer the plunger pump.