Honda Spree and Elite 50 Forums

Ok, so i got to thinking about the idea of using a NH80 oil pump that was mentioned in a thread a couple weeks ago, after waiting for a pump to pop up on Ebay for a reasonable price, i figured i would give it a shot. As much as anyone can preach the pro's of pre-mix, i do really like the "fill it and ride" aspect of having an oil pump hooked up on my scoot, and after kitting an engine you really do loose that possibility if you want to keep the longevity of your motor. After cleaning the inch thick layer of oil and dirt off it, i started some comparisons.

This is what i found (this is in comparison to SE50 pump, not sure about overall similarities to AF16) :
left is SE50 - right is NH80
the pump shaft is longer
it seems that the pump shaft is pinned in, you can see the possible pin on the base of the 80 pump (no time tonight to see if this is right)
mounting holes don't match up, but i believe this shouldn't be to big an issue, its close enough that i think i can make it work.

here is a comparison pic for reference


So, has any one taken apart a NH80 oil pump to remove the shaft?
Any one have any idea if the pump would put out to much oil at full tilt for a 65cc engine? Im not sure of the ouput of this pump, but i would imagine it would with the control wired open.
Or would it be better to cable tie the pump half open to accommodate for more oil, but not to much?
As long as the bases of the pump shaft are both threaded for their drive mechanism for the pump and they are the same thread pitch, i think this should be easier than i thought. they both look to be the same thickness, and the crank gears mesh with the SE50 crank as is.

Good ideas for thought

-- Ideas for experiments --
Press the NH80 pin out and verify an AF05 shaft fits.
Mix up a tank of pre-mix, run the NH80 pump into a graduate and measure output vs fuel consumed.

I never thought of that mouse, however my wives aero isn't exactly ridable, however I guess I could run it at idle with a specified amount of gas in the tank until it runs out. Then factor from there... First I gotta figure out how to get that pin out, I can't press it though, it looks like I have to pull it out.

turtle, if you can findmore roll pins at a hardware store, then try to drill out the pin. just a suggstion.

odinxxix wrote:turtle, if you can findmore roll pins at a hardware store, then try to drill out the pin. just a suggstion.

Drilling a steel pin in an aluminum housing is a very good way yo ruin the housing.

Bear45-70 wrote:

odinxxix wrote:turtle, if you can findmore roll pins at a hardware store, then try to drill out the pin. just a suggstion.

Drilling a steel pin in an aluminum housing is a very good way yo ruin the housing.

That's what I was thinking... I think I'm going to have to dremel out a notch on either side then pull the pin with some needle nose pliers.

turtle13 wrote:

Bear45-70 wrote:

odinxxix wrote:turtle, if you can findmore roll pins at a hardware store, then try to drill out the pin. just a suggstion.

Drilling a steel pin in an aluminum housing is a very good way yo ruin the housing.

That's what I was thinking... I think I'm going to have to dremel out a notch on either side then pull the pin with some needle nose pliers.

Much better idea.

Ok so the pin proved to be a real PITA to remove, got it out along with the pump shaft. First big difference is that behind the threads that drive the pump is slightly smaller on the 80.
Second there is a little bump out on the end that goes into the pump, where as the SE50 is flat on the end. However there is more threaded area on the SE50 shaft.
Third, the 80 pump "collar" that actually fits into the case work is a bit larger than the SE50.

so now down to the nitty gritty, and I am without pix as its getting late and my phone is dead...
I chucked the SE50 shaft into my drill, busted out the dremel and did some poor mans lathe work. I created the nipple on the end by grinding down some of the threading, and turned down the shaft till it fit. So far this seems to work (don't worry I probably won't run this shaft, I just want to see if mechanically it will work before I pay a machine shop to do it right) but I can't actually test so haven't gotten the collar worked down enough to fit the cases...

For now that's all. I'm hoping I can at least get this to a working "proof of concept" stage in the next week or so. So who wants to buy me the mini lathe from harbor freight so I can mill down my pump shaft correctly?

so after a few weeks, my computer dying and now building a suitable replacement computer... extra funds are to scarce to try to see this through. I hate to even admit it, but im not going to get around to finishing it anytime soon as this has become very obvious that i would need access to a lathe to turn down the housing to fit the block and the main pump shaft for any smoothness of operation. so unless any one wants to donate their metal munching skills and time in the name of the oil injection gods, sadly i am on hold.
The good news is that the computer i built will also serve as a cad machine that will drive a 3 axis CNC machine that is to be pieced together over the next year! now i just have to relearn AutoCAD, its only been since 2002 since i used cad, not too much could have possibly changed right!? (insert extreme sarcasm here)