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Old 11-10-2008, 06:26 PM   #1 (permalink)
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jackshaft questions 1990 polaris indy 500

I have a 1990 polaris indy 500 that I bought last yr as a starter sled for my gf. The chain blew at the end of last yr and I just replaced it and noticed that there is a lot of slop in the jackshaft and it moves around a lot. The sled moves but there is sort of a grinding noise coming from it. It is just resting on the pan not sure if it used to be welded in place or not. Just wondering if anyone has experienced this or has advice. Replace jackshaft, junk sled? anything would be great thanks
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Old 11-10-2008, 06:29 PM   #2 (permalink)
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There is a sealed bearing on each end of the jackshaft, one just behind the secondary clutch and one in the chaincase. Sounds like you have a bearing that let go... if nothing else is torn up, two bearings and an afternoon of work and you should be on the trail again.
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Old 11-10-2008, 06:35 PM   #3 (permalink)
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sounds good thanks any idea of where to get the parts? and a description of how to replace each one
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Old 11-10-2008, 06:54 PM   #4 (permalink)
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not to bad to do

i just replaced my bearing to my jack shaft and it wasn't to bad the bearing are cheap and while you are at it change both the bearing in your crank case..
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Old 11-10-2008, 09:33 PM   #5 (permalink)
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where did you get the parts?
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Old 11-10-2008, 10:06 PM   #6 (permalink)
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when i did my 500 i got the parts at a local sled shop. they worked on everything and were a dealer for aftermarket parts so it was only like $15-$20 a bearing. if i remember right the bearing on the chaincase side is a sealed bearing and the clutch side is a sealed w/a sleave and set screws. i would say that 95% of the auto parts stores in my area have the bearing cause they are a pretty standard size. also, when you have it out, make sure the shaft itself isn't damaged. mine was, and thats more work.
since you said you changed the chain i am assuming you know how to drain the chaincase and remove the gears. do that. the chaincase bearing may/maynot have a snap ring retainer, i don't remember. but if it does its visible from the chaincase side. other than that i should pop out w/ some taping. i found it easier to remove the whole chain case (3 bolts after the gears are out) and then change both gears. the cluth side: remove the belt and the secondary clutch. its a single 1/2" head bolt but make sure you get everything and remember the order it goes in. bolt, washers, spacers, clutch/key, and then the rear shims. then the bearing should be in a cup, remove it and the losen the 2set screws on the bearing sleave. that should do it. if you have more questions, ask. i did this on my sled lastyear and my new xcr this week-end, so its fresh in the memory.
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Old 11-11-2008, 07:05 AM   #7 (permalink)
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sounds good thanks I am going to try it this weekend, just seems that the guy I bought it off didn't take good care of it at all, and I don't want to have to replace the whole jackshaft. I just bought a new sled and for all this trouble if the jackshaft is bad too I may junk the sled and buy my gf a new one too but we'll find out on sunday when I get to it, I'll post pics of what I find and get your opinion on what should be done, thanks
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Old 11-11-2008, 08:24 AM   #8 (permalink)
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if you do need a jackshaft, i bought mine used for $50. so its not something i would junk the sled over if it is in okay shape otherwise. its just more work. if you put the new bearing on the shaft and it still moves around, then the shaft is worn also. oh, fyi... if you decide to take the chain case off to change the bearings, drop the track out, its much easier to get the bottom bearing off the shaft if there is no downward pressure on the bearing caused by the track weight. its like an extra half hour to get it out, but it makes life much easier. but thats only if you remove the chaincase, just the top bearing you should be fine leaving the chain case in.
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