Tested oil pump on 89; Surprise!

Starspa · 08-03-2009, 11:36 PM

After reading numerous cart owners with 2 cycle oil injected motors state that they have disconnected their pumps and have gone to pre-mix, I decided I wanted to know how much oil my motor was actually getting.

I attached two tubes vertically to a board and connected one to the oil pump and one to the gas line. I then used a calibrated syringe to inject specific amounts of oil and gas respectively.

I preformed two tests; one with the motor running slow and another running full throttle. The big surprise was that the motor burned 2 1/2 times as much oil while running slow than it did running fast.

(fast 145ml gas/1ml oil; 145:1) (slow 145ml gas 2.5ml oil; 58:1)

This is opposite of what I would have expected!

I have heard cart owners using pre-mix anywhere from 50:1 to the spec'ed 128:1, I think I might go with 100:1 and unhook the pump.

Any thoughts??

sccowboy · 08-04-2009, 02:33 AM

the pumps are known to fail and wil do so wthout any warning. I would premix and get rid of the pump.

capthump1 · 08-04-2009, 09:34 AM

I have an old G1 Yammy gasser that I run 70:1 it runs fine and dosen't smoke much. I've read that if you run too much oil you run the risk of filling your muffler with oil. When that happens I hear you then have a muffler Bar- b- que to clean it out.

sccowboy · 08-04-2009, 08:27 PM

true dat! lol

GoTeeMan · 08-04-2009, 10:25 PM

I am running my 1982 @ 50:1 am I running it too rich? I don't want to burn it down.

DEWDIGGLER · 08-05-2009, 06:12 AM

I Run Mine At 1 1/2 Oz To 1 Gallon

capthump1 · 08-05-2009, 08:42 AM

I don't think you will catch fire. When I said a muffler bar-b-que I meant you light a bar-b-que and roast the muffler to clean it out.

GoTeeMan · 08-05-2009, 08:44 AM

I guess I meant that I run it that rich for fear of running too lean and scorching the cylinder and piston.

capthump1 · 08-05-2009, 08:46 AM

Quote:

Originally Posted by DEWDIGGLER

I Run Mine At 1 1/2 Oz To 1 Gallon

85:1

Starspa · 08-05-2009, 08:55 AM

I read somewhere that one of the reasons the cart companies engineered the carts to use little oil was because the courses did not want smokey carts driving around.

Although 128:1 is not too little for idle, many jet skis idle at that ratio, recreational carts are not driven the same as they are on a course.

I like a variable injection system and was hoping that my pump delivered from 128:1 up to about 90:1, therefore I would have kept that system in place and premixed abou 20:1. That would have given me a range of 108:1 at idle and 70:1 running hard.

Unfortunately my pump has more output at the lower rpm's; there could be a reason I am not aware of.

08-04-2009, 02:33 AM	#2
sccowboy It ain't gonna be easy. Join Date: Apr 2008 Location: St. George, SC Posts: 1,480	Re: Tested oil pump on 89; Surprise! the pumps are known to fail and wil do so wthout any warning. I would premix and get rid of the pump.

08-04-2009, 09:34 AM	#3
capthump1 Getting Wild Join Date: May 2009 Location: (winter) Homosassa,Fl / (summer) Bayonne,N.J./ Port Jervis, N.Y. Posts: 131	Re: Tested oil pump on 89; Surprise! I have an old G1 Yammy gasser that I run 70:1 it runs fine and dosen't smoke much. I've read that if you run too much oil you run the risk of filling your muffler with oil. When that happens I hear you then have a muffler Bar- b- que to clean it out.

08-04-2009, 08:27 PM	#4
sccowboy It ain't gonna be easy. Join Date: Apr 2008 Location: St. George, SC Posts: 1,480	Re: Tested oil pump on 89; Surprise! true dat! lol

08-04-2009, 10:25 PM	#5
GoTeeMan EZ Like Sunday Morning Join Date: Jun 2009 Location: Owatonna, Minnesota Posts: 465	Re: Tested oil pump on 89; Surprise! I am running my 1982 @ 50:1 am I running it too rich? I don't want to burn it down.

08-05-2009, 06:12 AM	#6
DEWDIGGLER Gone Wild Join Date: Nov 2007 Location: OKOBOJI, IA. Posts: 247	Re: Tested oil pump on 89; Surprise! I Run Mine At 1 1/2 Oz To 1 Gallon

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08-05-2009, 08:42 AM	#7
capthump1 Getting Wild Join Date: May 2009 Location: (winter) Homosassa,Fl / (summer) Bayonne,N.J./ Port Jervis, N.Y. Posts: 131	Re: Tested oil pump on 89; Surprise! I don't think you will catch fire. When I said a muffler bar-b-que I meant you light a bar-b-que and roast the muffler to clean it out.

08-05-2009, 08:44 AM	#8
GoTeeMan EZ Like Sunday Morning Join Date: Jun 2009 Location: Owatonna, Minnesota Posts: 465	Re: Tested oil pump on 89; Surprise! I guess I meant that I run it that rich for fear of running too lean and scorching the cylinder and piston.

08-05-2009, 08:55 AM	#10
Starspa Not Yet Wild Join Date: Jul 2009 Location: Bismarck, ND Posts: 11	Re: Tested oil pump on 89; Surprise! I read somewhere that one of the reasons the cart companies engineered the carts to use little oil was because the courses did not want smokey carts driving around. Although 128:1 is not too little for idle, many jet skis idle at that ratio, recreational carts are not driven the same as they are on a course. I like a variable injection system and was hoping that my pump delivered from 128:1 up to about 90:1, therefore I would have kept that system in place and premixed abou 20:1. That would have given me a range of 108:1 at idle and 70:1 running hard. Unfortunately my pump has more output at the lower rpm's; there could be a reason I am not aware of.

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