Hey guys, I've been looking for a new mikuni oil pump for my carbbed 787. I've found one for a pretty good price, but can't figure out if it's an oil pump for an RFI or carbbed engine. My question is, what is the difference between the oil pump that was put on the RFI engines VS the one put on the carbbed engines? Are they completely different or at all interchangeable?
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787 Oil Pump RFI VS Carb
- Thread starter Hicktown
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The part#'s are different, and there is a big price jump in the RFI oil pump. Perhaps it's the same, but who knows how it's calibrated for the RFI. You can tell the later pumps from the older pumps as the older ones have the supply line pointing straight down, the later are rotated up 90 deg. You could PM [MENTION=41828]Minnetonka4me[/MENTION] and see if he has any used pumps, that would take your guess work out of the equation. You also know it's a good pump coming from him.
I might just have one brand new in the box...ill look.
Oil pumps rarely go bad, they just get blamed all the time. Typically the little oil lines get brittle and crack.
Oil pumps rarely go bad, they just get blamed all the time. Typically the little oil lines get brittle and crack.
The other thing is the big fitting for the incoming oil. Its pressed in and if it gets loose, its gonna suck air in or possibly leak oil into the hull.
AdamXP800
Well-Known Member
That's why this forum is so great, so much knowledge. I learn something new everyday.
I've never personally witnessed an oil pump failure. I've seen many issues due to lack of maintenance on the oil system but no failures from the pump itself
I've never personally witnessed an oil pump failure. I've seen many issues due to lack of maintenance on the oil system but no failures from the pump itself
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kicker
Well-Known Member
If that fitting is pressed on, then I would assume that a pump from a carbed ski will not fit on the RFI, but the RFI pump will go on on a carbed ski? The only thing would be the nipple will stick away from the mag housing rather then pointing down.
According to the manual both the RFI and Carbed oil pumps calibrate at .71-.87ml /30 sec on each line.
If the hose reaches and your right about the calibration...I would say they interchange.
Yeah, I hear you on that. I have heard that the pumps rarely if ever go bad. Which is why I am contemplating just putting my old oil pump back on. However, I just like the idea of having a brand new one on there, seeing as how it is a part that the entire engine depends on. The part is almost 20 years old so who knows. Of course I will also have all new oil lines as well. If you do end up having a new one for sale, let me know.
Thanks for the info. Seems like they would be interchangeable.
kicker
Well-Known Member
The Carbed pump will not work on some of the RFI skis, The RFI motor mount is directly under the oil pump, that is why they have an elbowed fitting for the inlet. In the picture you can see the bottom of the motor mount and why the inlet nipple is a 90.
Here is a carbed 787 with the straight inlet. The motor mount is offset, so the inlet nipple on the pump is able to go straight down.
n3k0de
Active Member
The Carbed pump will not work on some of the RFI skis, The RFI motor mount is directly under the oil pump, that is why they have an elbowed fitting for the inlet. In the picture you can see the bottom of the motor mount and why the inlet nipple is a 90.
Here is a carbed 787 with the straight inlet. The motor mount is offset, so the inlet nipple on the pump is able to go straight down.
Great insight. As others mentioned, the knowledge available on this forum is just outstanding.
I looked and I have a Brand new RFI and a brand new carb 787 oil pump available.
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