Re: Conversion from oil injector to premix
Ok, let me see if I can be some help. I will need the model year from you and then I will look in my library.
Yamaha followed Suzuki's plan for oil pumps and fitted a gear pump, not the Huff and Puff system favored by OMC and early Mercury. Mercury soon changed over to the gear pump when the H&Ps failed. The difficulty with removing the gear pump oiling system is that the pump drive must be removed otherwise the pump, having no oil flow, will seize causing catastrophic failure in the crank case and possibly cylinders.
Just finished rebuilding a Merc where the owner cut the lines and did not remove the pump shaft.
The Suzuki's,some models, have the pump where it is nearly impossible to remove without pulling the power head.
Of course I concur that these Yamaha pumps, as Suzuki pumps, rarely fail.
Why Bombardier continue to use the Huff and Puff defeats me, albeit supposedly improved.
The problem I see, even when a gear pump is used, is that some insist on that tank on the deck which requires pressure from the crank case to deliver oil to the internal gravity feed tank. Better than H&P in any event.
