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08-03-2009, 11:36 PM | #1 |
Not Yet Wild
Join Date: Jul 2009
Location: Bismarck, ND
Posts: 11
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Tested oil pump on 89; Surprise!
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?? |
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08-04-2009, 02:33 AM | #2 |
It ain't gonna be easy.
Join Date: Apr 2008
Location: St. George, SC
Posts: 1,480
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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.
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08-04-2009, 09:34 AM | #3 |
Getting Wild
Join Date: May 2009
Location: (winter) Homosassa,Fl / (summer) Bayonne,N.J./ Port Jervis, N.Y.
Posts: 131
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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.
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08-04-2009, 08:27 PM | #4 |
It ain't gonna be easy.
Join Date: Apr 2008
Location: St. George, SC
Posts: 1,480
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Re: Tested oil pump on 89; Surprise!
true dat! lol
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08-04-2009, 10:25 PM | #5 |
EZ Like Sunday Morning
Join Date: Jun 2009
Location: Owatonna, Minnesota
Posts: 465
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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.
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08-05-2009, 06:12 AM | #6 |
Gone Wild
Join Date: Nov 2007
Location: OKOBOJI, IA.
Posts: 247
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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 |
Getting Wild
Join Date: May 2009
Location: (winter) Homosassa,Fl / (summer) Bayonne,N.J./ Port Jervis, N.Y.
Posts: 131
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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.
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08-05-2009, 08:44 AM | #8 |
EZ Like Sunday Morning
Join Date: Jun 2009
Location: Owatonna, Minnesota
Posts: 465
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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.
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08-05-2009, 08:46 AM | #9 |
Getting Wild
Join Date: May 2009
Location: (winter) Homosassa,Fl / (summer) Bayonne,N.J./ Port Jervis, N.Y.
Posts: 131
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Re: Tested oil pump on 89; Surprise!
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08-05-2009, 08:55 AM | #10 |
Not Yet Wild
Join Date: Jul 2009
Location: Bismarck, ND
Posts: 11
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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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