H2 oil pump

[kawonda750]

Started it up on pre-mix. new clear line from tank to pump. It is pumping into the pump but not pumping well out to the cylinders. I can't see all 3 lines being plugged. Is the pump no good? could there be a blockage right after the intake and before the output?
You can see little bits of oil pumping to the cylinders but the lines are definitely not full.

[H2 Dude]

Try cracking the small cover and let the oil drip out that way to bleed. I just did my H1B on Sunday with no air in the line.
Dave what happens when hold the pump wide open?

[kawonda750]

you can see small bits, like bubbles of oil flowing to the cylinders. But, the lines don't fill.

[H2 Dude]

Must be sucking air somewhere I would guess.

[papagriff]

I made a test fixture on my mill to check pump delivery, had nothing but problems getting two pumps to pump. Found a small filter or wad of cotton in the fitting on the tank. had new line but never looked if there was a clog before it. Did they put filter material there on purpose?

[shiloh]

If there is air getting in then you should see oil leaks at any of the banjos. Make sure the feed line is fitted properly and clamped. I had problems there with mine.
Once the bike is running, hold the pump wide open at @ 1500rpm, it took my bike about 3-5 mins before the lines where air free.
After rebuilding mine I realized there is not much that can go wrong with these little pumps, After all, they are well lubed. Mine had no visible signs of wear, with 27k miles. Needed a couple heli coils and seal/o-ring replacement.
If you haven`t already, try removing the banjos at the cylinders and let them bleed that way. Other than that, the pump could be pooched if at some time the bike was run on premix and the pump was allowed to operate dry?.
Let us know what you find.

[cankaw]

I think I have a couple of spares if you need one Dave.
Adam

[kawonda750]

Thanks Adam. I will likely take you up on thT BECAUSE i LIKE TO HAVE A SPARE everything. it is pumping in well but not delivering so well. I tried bleeding it as per H2 Dude and will try it when I can, likely the weekend.

[kawonda750]

Got another pump from Cankaw, thanks Adam, and installed it. Same problem. The centre one does not fill up. It pumps but only in bits. I ran a small wire in the banjo at the pump to make sure it wasn't blocked. I don't want to do the same at the engine side because of the springy thingy. I can't see any leaks either at each end or along the pipe. Anything else I can try?

I will try blowing out the pipe with the compressor in the meantime.

[lc]

Do NOT blow your output lines out with compressed air! (If you do you will wreck the check valve spring).

Are all your oil line check valves properly sealing?

If the center line is dry and the valve leaks the oil bubble at the pump will be seen to simply move back and forth without filling the line. (the check valve enhances pump operation/priming by preventing back flow of both air and oil within the line)

To prime the pump:
With pump off the bike connect the supply line. Using a spare oil pump drive gear use a drill to spin the pump input shaft (tape the slot in the shaft closed so it remains on the drive). Hold the input lever open and when oil oozes out of the three output ports the pump is now primed.

Install the pump without disconnecting the input line. Place the output banjos into position along with the lower sealing washers. Using a syringe fill the cavity of each banjo. Install each banjo bolt with the top washer.

The system is now completely primed. If it still refuses to flow down the line the above noted check valve is likely the fault.

J

[JA-Moo]

The pump actually works by "pumping in bits". HAve you tried revving to 2-3 thousand and holding the cable cam full open?

[joker]

Did you do any cylinder work? The passage in the cylinder could be blocked?

[kawonda750]

I have been holding it wide open. I can see it pumping through. The other two lines are full so i don't think that priming is the answer.

I did have the cylinders off to check them. I am very careful about the oil feed passages when re-assembling, but, who knows ??

[lc]

Try replacing the large banjo bolt at the case end of the line (there is a very tiny orifice in it that may be blocked)

J

[kawonda750]

Is that the one right at the end, Scott?