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Old 02-03-2013, 11:52 AM   #1
ChadMn
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Default 488 oil pump adjustements

I swapped out the motor in a sled for a buddy this week, the guy he bought it from said to be sure you bleed the oil pump out. 9Is it as simple as removing the feed line that goes to the pump, or do I need to bleed it after the pump ? Thanks.

This is a 488 air cooled from 1993
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Old 02-03-2013, 09:52 PM   #2
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There should be a bleed screw on the top of the pump. Loosen it until oil starts oozing out. That will let you know the air has been purged. There is still air in the lines from the pump to the engine, so it's best if you premix the first tank of gas with oil to make sure that the pump is going to work.

Any time I mess with an oil pump, I premix the first tank. That way, you can fill the oil tank completely full and make sure the pump is pumping. I learned that lesson the hard way. Made 4 1/2 miles on a new engine before it seized from lack of lube. That squeak sound is not something you will grow fond of hearing, trust me
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Old 02-03-2013, 10:04 PM   #3
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Thanks Dan, 40:1 ratio correct ?
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Old 02-05-2013, 12:16 AM   #4
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with modern oils, you can probably go a little lighter and do 50:1. That's about what the oil pump will produce. The pump will do about 100:1 at idle and maybe 40:1 at wide open throttle. If you put 40:1 in the tank, you will be 20:1 at wide open. Take extra plugs.
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Old 02-06-2013, 04:40 PM   #5
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Took it for a 25 mile break in. Ran fine but doggy ( from rich mix I assume) . But it never died or anything. Oil pump is working , oil level dropped. But when I pulled the plugs one cylinders plug was very hot, while the other was cool enough to handle with bare hands. Maybe that one just fouled right away ? It was black and oily while the other was brown and hotter than molasses. Im a little concerned there, but Ill finish this tank off, put new plugs and fuel in and then see how it looks.
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Old 02-06-2013, 09:58 PM   #6
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You shouldn't be able to hold on to a plug that's gone a mile, let alone 25. I would think there's a lack of spark on the cold one. I would check the wires to the cool plug. It could be the boot isn't making a good contact with the plug, or the wire to the boot isn't making a good contact with the boot. You can test this by switching the wires to the plugs, if the problem follows the wire, check the wire. If it stays on the same cylinder, it could be a fuel issue on that side.
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Old 02-07-2013, 09:37 AM   #7
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I did get zapped while touching that plug wire the other day, Ill check that.
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Old 02-07-2013, 01:40 PM   #8
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It was a loose connection, took it for another long ride and it ran flawless. Thanks
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Old 02-07-2013, 09:56 PM   #9
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Good deal

Got to like cheap and easy fixes!
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