gt750 oil pump ???

[Suzukidave]

These pumps move very little oil at idle so you really wouldnt see much movement , thats why it is alway suggested to swing the arm on the pump to full just so you can . If oil moves when you move the pump arm to full and its all set correctly to the marks you most likely are good to go .

[Eddie]

Thanks alot for the info, I think I have one good set of lines out of about 7 sets and one good pump out of about 5 pumps all together. I love the bike but this is a horrible design, and its even worse that these parts, mostly the lines are not made or reproduced anymore, ohh well its amazing that the whole engine depends on such a design, all it takes is one little particle in the oil tank to clogg the pump or the check balls in the banjos and your done.....not just the pistons but crank as well, wow

[Suzukidave]

I started putting a fuel filter inline between the tank and the pump to catch the small particles . GT Reiner carries the gasket so the pumps can be taken apart and cleaned up .

[Eddie]

what type of fuel filter? thats a good idea , thanks for the help...

[Suzukidave]

They are just the easy to find lawn mower type plastic filters , when you hook it up please be sure you have flow through the filter.

[Eddie]

That was why I was asking, I was afraid it may not let oil through if the filter was to fine,

[tz375]

Pinkpossum mentions a simple test. Fill the lines with oil of a different color than the oil in the tank. Fit pump, ride and look. If the oil in the lines changed color it's all OK.

As I mentioned earlier and Dave repeated, output at idle is next to zero on the crank outlets and zero on the cylinder outlets.

"The crank side pumps 7cc per HOUR at 2166 engine rpm at almost all revs (fixed output). The cylinder side pumps zero at closed throttle, rising to 48cc at 2166 rpm ......"

7cc per hour is basically nothing and that's what it is designed to pump.

[Eddie]

I think I know what the problem is now, but im not sure, I will have to experament on it again tomarrow if the wife lets me, iv been screwing with these pumps for a few weeks now, shes about to divorce me and take the bike anyway..... I think the problem is the shaft on the lever, if you look at the possums pics, it shows the eccentric part that is ground for the little point at the top of the barrel, this is what causes the barrel to rise and lower more when you move the lever(throttle), I just noticed that on one of mine the shaft is worn really bad where the eccenrtric is ground in the shaft ,Im thinking it may be causing it to not oil right, I tried taking a pic but I was not able to download it, if I dont work in the morning I will try to download a pic of what it looks like, maybe you guys can see what Im talking about. pics are better than me trying to describe it. Also is it possible that the shaft itself could be in the top cover wrong? before i took the pump apart it looked like somebody already had it apart? and im wondering if they took the shaft out? or can you take the shaft out? it looks like you can but i have not tried.. anyhow I think im getting close to have at least one set that I like, thanks again for your help,,, if I get a divorce I will post the bike for sale on here first,,,,heeeheeee

[tz375]

Eddie,

That's quite possible that something is worn and it makes sense that it's worn at the idle or low throttle position. If you could email me a picture of that worn part, I could use it to update that web page.

[Suzukidave]

Also it should be noted ( though not a problem right now ) that if in the past by a PO or your self during a pump dissassembly that the arm can be installed 180 deg out so at idle the pump is full on and at full throttle the pump acts as its idleing . You can check this when the pump is off the engine , when you move the pump arm from the idle position to full output .. the drive shaft sticking out the bottom should move upwards into the pump a small amount .

[Eddie]

Ok, first who or how do I get in touch with gt reiner? I need the gasket for the oil pump cover, I tried saving them but they just came apart, I then went to automotive store and got the thinest gasket material they have and it is way to thick. The 1st pic is of the oil pump that would only oil at idle, the shaft I think is in the cover wrong(180 out), the 2nd pic is of a normal looking shaft, and the 3rd pic is of the shaft that has a notch worn in it, I guess this is normal wear? but this must have happened after alot of miles I would think. I didnt think anything of this untill I was testing it and the lever would get stuck in one position and it wouldnt oil, and i couldnt get the lever to move back or forward, you cant really see it in the pic but the notch is worn from the fron to the back and it is worse than it looks in the pics, my phone camera is shitty sorry, anyway the top of the barrel that has the little point would get stuck or ride in this groove, which would not let the pump , pump like it should, i know this because i changed just the tops and everything worked fine. I have 3 pumps, one is the older style and 2 are the newer ones..

[Eddie]

sorry but this was the only way it would let me download all pics.. this is the good shaft, nothing worn...

[Eddie]

ok and this is the bad one, look at the eccentric part it is worn pretty bad compared to the other ones,

[Eddie]

notch is worn in the eccentric part

[Eddie]

sorry but my cell phone is really old and the pics are bad,,,,,,,,,