Polaris 440 Case Mod - Page 3 - HCS Snowmobile Forums

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Old 02-05-2008, 12:16 AM   #21 (permalink)
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hey guys, i have been looking for a 600ho and if i get one i want to run pre-mix. is this a must do on the 600ho's, or is it already done? how about the ves also?
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Old 02-05-2008, 12:25 AM   #22 (permalink)
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i just pulled my 730 apart which is built with 440ho cases 600 crank and big bore jugs,, anyways its got the driled cases for the water pump and the oil was all over the place the gear had no problem getting lubed and looked to be in "brand new condition". Id say its got 1500 miles on it. and 90% was at 8 grand!
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Old 02-05-2008, 03:38 PM   #23 (permalink)
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Quote:
Sorry I missed this one Guy.

Taking off the water pump cover doesn't get to the gear cavity so you can't get shavings out that way. If you are careful and turn the motor up side down no shavings will get into the gear cavity.

The stock base gasket for late model 440's and most 600's is the .015" thick one P/N 5812494.

There are 3 other base gaskets available for these motors.

5813069 .006"
5813070 .010"
5813071 .020"

You can do a lot with your motors performance by changing base gaskets, but you have to know what you are doing as you decrease the squish.[/b]
thanks AK

what would the different base gaskets do? i guess a thick base gasket would raise the cyl. up and you would have less compression?
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Old 02-19-2008, 01:28 PM   #24 (permalink)
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[quote]



i trail rode it this weekend and it was pretty sweet to ride
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Old 02-21-2008, 08:35 PM   #25 (permalink)
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<span style="font-family:Comic Sans MS">hey thats nice how much one of those caust </span>
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Old 02-23-2008, 02:04 AM   #26 (permalink)
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okay Tom, question. I had a 04 440 motor that had the crank sieze at about 500 miles. my question is if i split the cases and do the mod are the cases still good, or are the junk along with the cranks?
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Old 02-24-2008, 11:09 AM   #27 (permalink)
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Quote:
okay Tom, question. I had a 04 440 motor that had the crank sieze at about 500 miles. my question is if i split the cases and do the mod are the cases still good, or are the junk along with the cranks?[/b]
It depends if your cases are within tolerance or not. The best thing to do is bring your bottom end to an engine tech or polaris shop and have them check it. Sometimes when the crank locks up, the bearing spins a little in the case and throws them out of tolerance. This can be fixed two ways, if it isn't that far out, the cases can be line bored to true up all the main bearing saddles. If the case is too screwed, you need to replace it. Most of the time the naked Eye can't tell if a case is good or not, so don't listen to your buddy who says "they look fine to me, throw a crank in it and go" because sometimes it works fine, and sometimes (like with my 900) the cases need to be line bored.
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Old 02-25-2008, 10:04 PM   #28 (permalink)
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ok thanks. how much would it cost to fix if need be and how much are good cases worth?
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Old 03-01-2008, 12:03 PM   #29 (permalink)
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how many miles will this give me on my 04 440 im trail riding it and i was wondering if i will get a good amount of miles out of doing this
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Old 03-03-2008, 01:23 PM   #30 (permalink)
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Hi, This is great and really informative. Does anybody have any info on converting my 04 PROXR 440 to oil injection?? That is what I would really like to do. thanks.
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