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Thread: Need help!

  1. #1
    Join Date
    Mar 2015
    Location
    Central Iowa
    --
    54

    Need help!

    Hey guys, I have a mid 80s Polaris Indy 400 liquid cooled that has a fresh top end rebuild and new gaskets but will not run correctly. Plugs foul easily, it has a low end bog and a top end bog as well. Mid range is okay but it is driving me crazy having no power. I want to be able to hop on it and rip across a field just like all of my other sleds. Any help and advice would be greatly appreciated! Thanks.

    1985 Honda 250es Big Red (Daily Driver)
    Multiple Honda ATC 90s and 110s
    1984 Honda 200s
    1983 Honda 185s

  2. #2
    shovelryder's Avatar
    shovelryder is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Nov 2012
    Location
    Buffalo, MN
    --
    427
    New reeds? Fuel pump and filter get rebuilt? Carbs got rebuilt and synched properly?

  3. #3
    Join Date
    Mar 2015
    Location
    Central Iowa
    --
    54
    Quote Originally Posted by shovelryder View Post
    New reeds? Fuel pump and filter get rebuilt? Carbs got rebuilt and synched properly?
    Yes. I don't believe it has reeds.

    1985 Honda 250es Big Red (Daily Driver)
    Multiple Honda ATC 90s and 110s
    1984 Honda 200s
    1983 Honda 185s

  4. #4
    shovelryder's Avatar
    shovelryder is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Nov 2012
    Location
    Buffalo, MN
    --
    427
    My bad on the reed part.......Sounds like a state of tune carb issue for sure though.

  5. #5
    Join Date
    Mar 2015
    Location
    Central Iowa
    --
    54
    Quote Originally Posted by shovelryder View Post
    My bad on the reed part.......Sounds like a state of tune carb issue for sure though.
    That's what I thought too but I've done everything I can think of. Needless to say it's for sale haha

    1985 Honda 250es Big Red (Daily Driver)
    Multiple Honda ATC 90s and 110s
    1984 Honda 200s
    1983 Honda 185s

  6. #6
    86 350x's Avatar
    86 350x is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Sep 2005
    Location
    Canada (ontario)
    --
    200
    Crank seals? Did you pressure test the bottom end?

  7. #7
    Join Date
    Nov 2011
    Location
    New york
    --
    115
    Quote Originally Posted by 86 350x View Post
    Crank seals? Did you pressure test the bottom end?
    +1 for crank seals me and my buddy rebuilt his older Indy and could never get it running right no matter how we jetted/tuned the carbs. It was doing the same thing as you say yours is, guttless bottom end and top end. As 86 350x said definitely test the bottom end.
    Quads:
    2004 Ltz-400
    2012 Ltz-400
    Trikes:
    85 ATC 250r
    85 Tecate
    82 Tri-moto 125(The wheelie machine)
    85 ATC 70
    85 ATC 110
    84 Zinger
    Bikes:
    03 Rm 60
    Sleds:
    05 f5 Firecat
    78 Lynx 275

  8. #8
    Xfile's Avatar
    Xfile is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Apr 2007
    Location
    Shiocton, Wisconsin
    --
    694
    +2 for crank seals.....if you are planning a leakdown test on 30 year old crank seals then you have already answered your own question...it needs them. You don't need to remove the top end again however. Pull the engine, remove the clutch, flywheel, and stator. Then you can remove the lower crank case half, lift the crank up a bit, removed the old seals, slide the new seals on and re-seal the case halfs.
    Don't worry...just run watcha brung...

  9. #9
    Join Date
    Aug 2015
    Location
    Portland Oregon
    --
    174
    Spray soapy water & look for air bubbles. Do you trust your machine shop; did you check your cranking compression? Air Leaks
    This type of question goes out on most every rebuild. If you’re a regular reader you should already know what to do.

    John Tice
    503-593-2908 Alternate 541-508-3944
    www.smallenginemachineworks.com & www.nwsleeve.com
    Turning Custom Cylinder Sleeves Since 1971

  10. #10
    Join Date
    Oct 2008
    Location
    NB, Canada
    --
    853
    How's the clutches? Very well still good be a motor related issue, but clutches often get overlooked.
    Rides:
    1985 250sx
    1982 ATC185s
    1984 200es

    Always Hoping For a Maritime Trikefest- http://www.3wheelerworld.com/showthr...s-where-you-at

    "Wear Limits Are Just A Suggestion"

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