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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.

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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 05:42 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

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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

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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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    sb_racer827's Avatar
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    Quote Originally Posted by X-Treme3x View Post
    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.
    This is correct, the 440 IQR pistons are still currently available directly from any Polaris dealer, and a perfect drop in if you have a 98 engine with the 20mm wrist pins.

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    sb_racer827's Avatar
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    Hi everyone, new member here, just finished reading all 700+ pages of this thread! Tons of info here, glad I stumbled across it!
    I just picked up my first red rocket, it’s a 1997 XCR 440, it’s seen better days as it has 5000+ miles. Luckily the chassis is very nice, and very straight, the foot wells aren’t bent up like the most of them. My plan with this one is a full ground up restore. I’ve restored 70’s TX/TXL/Starfire’s in the past and recent got interested in the newer stuff, so I figure this would be a worthy and rare sled (559 built) to give the full treatment. The motor is currently apart, waiting on some seals and gaskets to come in for it. It’s the original 97 bottom end & silver head cover, with the updated 065 cylinders and power valves. It still runs the 18mm wrist pin crank, and luckily I was able to track down a few sets of original 18mm Polaris pistons for it (including a set of the first L ring pistons, which will stay in the closet as a nostalgia piece LOL).
    My hood & nose cone are from an Indy 500, that someone painted too dark of red years ago, and it now busted up in a few spots, so ill be using an NOS white domestic hood that we will be painting the correct red. I was lucky to find an original nose cone with the correct colour, and have a very good painter who is confident he will can mix up a batch with the correct metal flake and make it perfect. I’m excited to get it torn down and start the restoration which will include with all new OEM bolts & hardware with a professional paint job, NOS decals & as many NOS parts that I can find etc. My goal is to make it as close as I can to how it came from the factory. Currently just gathering the parts together to make assembly a quick & easy process without having to find parts along the way when that time comes.
    Here’s some pics!
    Attached Images Attached Images      
    CanadianXCR likes this.

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