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XCR 440 owners.

This is a discussion on XCR 440 owners. within the Polaris forums, part of the Brand Specific Snowmobile Discussion category; Fuel is good but I need to check carb boot, I will hopefully get time tomorrow night to report what I have for current specs. ...

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Thread: XCR 440 owners.

  1. #7051
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    Fuel is good but I need to check carb boot, I will hopefully get time tomorrow night to report what I have for current specs. Thanks for the info so far

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    Got the carbs tore apart and here are my current specs, they didn't seem too dirty but running them thru Ultrasonic Cleaner
    1.5 Needle Valve
    159 P4 Nozzle
    350 Main
    6DH7 #2 Position
    4.5 Pilot
    7/8 Turn on Air Screw

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    CanadianXCR's Avatar
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    That appears to be fine, those settings are even rich. You sucked air into the motor somewhere as RRXCR has indicated. Time for the ether spray test or a engine leak down test. Show us the plugs. Whats compression at?
    '98 XCR 440 "Red Rocket"

    370 Mains W/TempaFlow Airbox Vented Under Shelf 1/8 Turn CCW
    17.5 Pilots W/UFO's & Torque Flows
    P-4 286 Needle Jet W/6DH7 Needles #2 Position W/1 .020 EGT Shim
    S53Red Weights, Polaris Almond/Gold W/911 Response Cover
    TEAM TSS98 66-44-.46, Red/Blue
    22/41 Gearing
    Camoplast Ice Ripper
    Kimpex Arrow Skis W/Woodys Carbides
    Koso EGT/H20/RPM Digital Gauge

    '16 Switchback Pro-S 800 Snow Check

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    Both Cylinders are at 120psi

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    RedRocketXCR's Avatar
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    Check this out. 120 is low. A lot of gray ... not good. Dig into it in the off-season.
    Name:  readingplugs.jpg
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    Plugs from my 98 XCR 440. Still a bit fat, but close and running well.
    https://www.snowmobilefanatics.com/f...ture350939.jpg
    Last edited by RedRocketXCR; 03-21-2019 at 04:42 PM.
    2 - 98 Red Rockets
    1 - 136" Edge w/ Fox Clicker, 1.25" Predator, SLP SLT skis
    1 - 136" Xtra-10, 1.25" Ripsaw, IQR skis
    Tempa Flow installed below shelf, carbs vented to air box . 1/8 turn ccw, Elevation: 950
    370 mains, 159 P-4 nozzles, stock 6DH7 needle #2 pos. w/ 1 - .020 EGT shim
    3.5+ UFOs, 17.5 pilots, 1.75 turns on air screws
    black, w2 weights
    Team TSS-04 66/44-.46, red/blue LH spring w/ 3 delrin washers
    20/39 gears

    00 XC 600 136" Edge w/ Fox Clicker, 1.25" Shockwave
    400s T-Flow #1 w/ 1- .030 egt shim
    Pol blu/wht, 10-62s (62.5), 34X, EPI purple #2, 23/40
    Boss seat, Tru-Vert riser, SLP Powder Pro skis





    http://mrcc.isws.illinois.edu/cliwat..._SNDP_MAPS.htm

  6. #7056
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    CanadianXCR's Avatar
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    120 psi is low for this engine. Some testers vary quite a bit from my experience so you might want to try another first to verify your compression readings. Pull the manifold to get a better look at the pistons on the exhaust side.

    Hopefully there isn’t too much damage.
    '98 XCR 440 "Red Rocket"

    370 Mains W/TempaFlow Airbox Vented Under Shelf 1/8 Turn CCW
    17.5 Pilots W/UFO's & Torque Flows
    P-4 286 Needle Jet W/6DH7 Needles #2 Position W/1 .020 EGT Shim
    S53Red Weights, Polaris Almond/Gold W/911 Response Cover
    TEAM TSS98 66-44-.46, Red/Blue
    22/41 Gearing
    Camoplast Ice Ripper
    Kimpex Arrow Skis W/Woodys Carbides
    Koso EGT/H20/RPM Digital Gauge

    '16 Switchback Pro-S 800 Snow Check

  7. #7057
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    Thanks for the information guys, snow has all melted and yup good summer project, hope I caught things in time with little to no damage. I will post more info later on my findings.

  8. #7058
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    X-Treme3x's Avatar
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    Anyone have a line on some good ol factory Polaris pistons? Im going to have my motor completly re-done by a shop most likely I hope @ Iantomasi even get it put on the Dyno to see where it peaks. I plan on brining my sled to Alberta and I would like to completly pull all the bolts of of it and re-do everything. But I want the motor to go somewhere where they can properly do all the checks. IIRC I think guys are dropping IQr pistons into these now?

    Good to see things are still mobile on here with this thread.
    Baddeck, Nova Scotia To Whitecourt, Alberta
    1998 XCR 440
    2013 Summit 800 163
    2015 Summit 800 T3 Boost-It

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