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post #1 of 16 (permalink) Old 01-11-2017, 02:10 PM Thread Starter
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Oil pump or drive failure

HI guys, I am new to the site, which is nice by the way! I have just recently bought a used 1991 Polaris Indy 440 sport, the PO said when he bought it he rode it for 6mi then it blew up, he took it to a motorsport shop and they said the oil injection had failed and the engine needed rebuilt so they rebuilt it $750 and told him it would be another $300 to fix the oil injection, he told them not to fix it and that he would just premix the fuel,,,,, Now I own it and I am wondering if it OK doing it this way??? I have heard like the exiter 440 would not get oil to the crank bea rings this way, am I ok with my Polaris pretty mixing for now anyways? ??? I may fix the oil injection later
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post #2 of 16 (permalink) Old 01-11-2017, 03:19 PM Thread Starter
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I may add the pump and everything is hooked up just the way it should be as if the pump was functioning right now, do I need to bypass it or anything since it is not working? I am going to remove the pump soon and see if I can tell why it is malfunctioning, I am guessing maybe the shaft in the engine that drives the pump perhaps, I don't know and won't till I tear into it
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post #3 of 16 (permalink) Old 01-11-2017, 07:13 PM
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Running premix should be fine. I would definitely figure out why there's an issue. The drive shaft is gear driven off of the crankcase, so if there's damage to the drive gear, you may have a bunch of small pieces of metal inside the crankcase... that's not a good thing.

2017 SKS 800, 2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

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post #4 of 16 (permalink) Old 01-12-2017, 07:33 AM Thread Starter
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Hopefully the motorsport shop cleaned the engine out before they rebuilt it BC Dan, but I will still be checking it out!
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post #5 of 16 (permalink) Old 01-12-2017, 04:46 PM
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$300 is excessive too.


Darn near all the parts can be bought for around $140. ALL the parts. Meaning, housing, bolts, hoses, spacers, o-rings. They are rebuildable too. 99% of the time, the failure is just an o-ring or seal. Talking less than $10 repair. Stealershops like to replace the whole unit.

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post #6 of 16 (permalink) Old 01-12-2017, 05:30 PM Thread Starter
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I got ya ThebearAK , sounds good, real good, hope I can get to the bottom of it! I have no problem repairing it myself. Is there anyway to bench test these pumps? Also how is the bleeding process done? I will more than likely answer my own questions when I work on the thing but a good heads up from good mechs like yourselves would be nice hehe
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post #7 of 16 (permalink) Old 01-12-2017, 05:33 PM Thread Starter
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Also I see a filter, I haven't even pulled the line yet to see if it may be plugged but I am assuming it is more than that at least if the motorsport shop was honest anyways, I hope it is nothing more than the pump itself but have read they rarely fail?
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post #8 of 16 (permalink) Old 01-12-2017, 11:51 PM
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Oil pump failure is not common.

To bleed the pump, there's a bleed screw on the top of the pump. Unscrew it part way and let it sit until oil starts oozing out around the screw. Tighten. There will not be any oil in the lines from the pump to the carbs but the pump won't have air in it. If you want oil all the way up, pull the plugs, put a bit of 2-stroke oil in the plug holes (to protect the cylinders) and take a wire and pull the oil pump lever full on. Then pull the rope about 50-100 times. By that time, the pump should have purged all the air from the pump to the carbs.

If you decide to get the oil pump system working, after purging, I would still recommend running at least one tank of pre-mix oil/gas to make sure the pump is working properly. You may foul plugs with double-oiling, but that's a small price to pay to make sure you don't burn the pump up.

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post #9 of 16 (permalink) Old 01-13-2017, 07:38 AM Thread Starter
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BC Dan, everything you say is spot on, except I don't think there are any line from the oil pump going to carbs, just 2 hoses 1 small 1 a little larger going to the engine from what I remember????? Is this correct I can look again
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post #10 of 16 (permalink) Old 01-13-2017, 09:36 AM
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The fittings may not be on the carbs, they are on the cylinders below the carbs on the intake. Oil is introduced in the air stream from the carbs. Sorry for the confusion

2017 SKS 800, 2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
http://www.kbsnowdrifters.org/
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post #11 of 16 (permalink) Old 01-15-2017, 09:29 PM Thread Starter
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I removed the oil pump today and tried to perform a bench test on it and clamped it in the vise put the oil res. hose in oil and pulled the throttle cable up and used a drill with a bit and small piece of rubber hose to keep bit centered and turned the shaft counter clockwise and nothing, pumped no oil at all, so I got another oil pump coming, we'll see if that does the trick, it was cheap be nice if it all works out, I will still mix fuel to make sure at first that oil level drops
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post #12 of 16 (permalink) Old 01-15-2017, 11:00 PM
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Good plan on the premix until it's working! Good luck in the repair!

2017 SKS 800, 2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
http://www.kbsnowdrifters.org/
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post #13 of 16 (permalink) Old 01-16-2017, 11:34 AM Thread Starter
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Thank you BC Dan for your help, I will give a follow up on the sled once I get the pump
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post #14 of 16 (permalink) Old 01-18-2017, 06:20 PM Thread Starter
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By the looks of things I would say the sleds oil injection is probably fixed, I can barely see the sled in my garage, didn't smoke like that before, hehe I fixed the brake master cylinder while I was at it also. Thanks for your help guys, I will continue to use mix till I can see the oil level drop in the resivoir if I can keep it running that is.
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post #15 of 16 (permalink) Old 01-18-2017, 06:22 PM Thread Starter
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post #16 of 16 (permalink) Old 01-19-2017, 11:22 AM
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You can use the sled in the summer to fog mosquitoes!

Gotta love the smell of 2-stroke in the morning Make sure to take extra plugs until you verify that your pump is working. Double oiling will likely foul a plug pretty quickly. Sometimes when that happens, I have been able to get the plugs going by burning off the oil with a propane torch... be careful if you do that, the electrode gets really hot. Leather gloves are your friend

2017 SKS 800, 2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
http://www.kbsnowdrifters.org/
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