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    Two 440's with same problem?

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    • Member since
      November 2008
    Two 440's with same problem?
    Posted by ARCTIC97SK on Wednesday, January 13, 2010 10:10 PM

    Hey guys, A buddy dropped off his sleds for me to look at ( He is not mechanically inclined- but loves to ride) saying both sleds have issues. One is a '95 XCR440 special, other a '96 Sport 440 l/c. Both sleds start up nice, idle fine, run good cold. However, after 15-20 minutes of riding BOTH sleds bog out, and will not even move themselves. I had to ride them to confirm, and yes, that is exactly what happens. After 5 minutes of cooling down, both sleds run great, then begin to lose power, and will not move. You could do this all day (as I did). I have cleaned carbs, checked coolant level, and flow, and the plugs are golden brown!  I'm stumped- anyone else have this problem? Any info appreciated!

    • Member since
      July 2005
    • From: Tewksbury Ma..
    Posted by RogerBzXCR on Wednesday, January 13, 2010 11:05 PM

    Check Compression.. 120 + is a good # COLD engine they do it again after the boggin starts?

    compression should be with in 10% of each cylinder

    Have the clutches been serviced.. maybe time for rebuilds on the clutches, both primary n secondary

     

     

    • Member since
      August 2005
    • From: MILTON,NY
    Posted by ALPINE SPORTS RACING on Thursday, January 14, 2010 6:40 AM

     I WOULD CK COMPRESSION TOO!!

    JUST HAD A 550 POLARIS FAN COOLED, RAN GOOD THEN AFTER 20 MINUTES WOULDNOT GO FASTER THAN 30

    CHECKED COMPRESSION WHEN COLD ONE WAS 120 THE OTHER WAS 110

    THEN WARMED UP THE MOTOR 120 WAS THE SAME THE 110 DROPPED TO 100

    PUT NEW RINGS IN AND NOW RUNS FINE

    2-STROKE TRIPLES FOREVER!! WWW.ALPINESPORTS.MYSITE.COM
    • Member since
      February 2008
    Posted by Btoby on Sunday, January 17, 2010 7:59 AM

    how cold?

    are the carbs freezing up with water in the lines?

    how old is fuel?

    doubt comp issues or clutch issues.

    Moderator
    • Member since
      October 2005
    Posted by Oneshot on Thursday, January 21, 2010 7:16 AM

    Depends on how many Miles these Sleds have on them but, Models this old could both be due for a new Top End. Depending on shape of Pistons, you might even get away with only having to buy Rings. I would think it's either time for Rings and or a Rebuild or somethings getting hot and shutting down the Ignition maybe. Could however be like the previous Feller said, once the Engine warms up the Rings are too worn to maintain a seal. Use a really good Gauge and double check those two cyls. on each Sled.

    Good Luck.

    Rob.

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