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Hesitation from take off

This is a discussion on Hesitation from take off within the X2/X4 Engine forums, part of the Yamaha Wolverine X2 & X4 847cc SxS category; I've had this happen twice now. It almost acts like a rev limiter. I suppose it could be bad dealership gas but I would think ...

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  1. #1
    Super Moderator MassiveOverkill's Avatar
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    Hesitation from take off

    I've had this happen twice now. It almost acts like a rev limiter. I suppose it could be bad dealership gas but I would think it would have happened more often. Come to a complete stop, take off again and everything is fine. Anyone else experience it?

    UPDATE: https://www.wolverineforums.com/forum...tml#post202338

    Simply let your bike warm up for a minute or two before heading out in cold weather.

    Last edited by MassiveOverkill; 12-17-2017 at 06:25 AM.
    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
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    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
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    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
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    OEM rock sliders
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    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

  2. #2
    Engineer TINKEN's Avatar
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    Sounds more like it is starving for fuel off the bottom

  3. #3
    Mechanic Karlburns's Avatar
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    That is weird it does sound like it's starving for fuel though. Reminds me of when carbs have problems going from pilot to main and falls flat on it's nose.

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    Speed Demon jimclemjr's Avatar
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    Agree on the fuel starvation- like you have a rag floating in your gas tank and its getting around the pickup when it settles. Does it matter how long you sit before it does it? Does it run strong when not doing this? If the fuel line or pickup is compromised then that could be the culprit. If you have a meter put it on your fuel line to check.....I think it should be in the upper 40's psi but verify on manual. But since it's a 2018 it is probably still under warranty and the dealer should address.
    2016 Wolverine R-spec EPS- Camo, , JBS CVT grind, 16 gr OD, Purple, slugs, JBS mudguards, Autometer Temp Gauge, OEM stickguards, Flip wshield, Auto tie rod ends, Dual batts/manual switch, ALS defeat, Method 14" B-locks, 27" 9 & 11Maxxis Vipr,4000 Moto Max winch, Yama trunk, 20" single row roof light bar, Rigid D pods on bumper, 3"rear cage lower, harness bar and 4 pt harnesses, JBS/Eibach springs

  6. #5
    Couch Potato
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    I test drove an X4 a few weeks ago and it did the exact same thing. The salesman blamed the seat sensor or seatbelt sensor, something like that. I didn't buy the excuse. Felt exactly like fuel starvation, but the tank was more than 1/2 full. This was a machine owned by one of the technicians in the back. I came to a stop, then started off again (never shut it down) and it was normal after that. Given that it ran great afterwards, not sure I feel it's something tank related, but who knows. Not a good first impression of the machine. The 6 month warranty is WAY too short for a brand new machine that might exhibit some teething problems. Anyway, interested to find out what the problem is if you find it.
    MassiveOverkill likes this.

  7. #6
    Belt Smoker Planetcat's Avatar
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    If its still original gas from dealer, i would drain the tank and/or put some heet water remover in there, and fresh gas. Im thinking it could be water in the tank from condensation. That is probably the first and only tank of gas that buggy has ever had.
    MassiveOverkill likes this.
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  8. #7
    Super Moderator MassiveOverkill's Avatar
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    I'm going to run the tank pretty low and then refill with some ethanol-free 91 octane. I'd use 85 ethanol-free but they raised the compression on this new engine and even though I'm in a higher altitude, I don't want to risk it. I wish they would offer 87 ethanol-free around here. I should have taken a hint from the salesman when he asked me if I wanted the free fill-up.

    I can believe the seat belt sensor. I've had that stupid thing happen on a Can Am and it acted almost identically. Although I love the drive-by-wire, I could see some possible bugs being exposed now that the real world has their hands on the X4. I'm sure if it is an ECU bug, it will be able to be reflashed easily by the dealership.
    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
    Over 6000 miles and 425 hours
    Hunterworks prototype sheave with easy cleanout port, 22 gram HV weights
    Weller Racing ECU flash
    HMF Titan Series Quiet slip-on Exhaust
    Walker Evans shocks
    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
    Tinkseal additives
    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
    OEM skid plates
    OEM rock sliders
    OEM A-arm guards
    OEM cargo box
    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

  9. #8
    Super Moderator MassiveOverkill's Avatar
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    It's not gas. It's driving situational. It happened again, in exactly the same spot. Driving really slow in high gear, then downhill to a stop and then punching it while on a decline.

    TimberWoof likes this.
    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
    Over 6000 miles and 425 hours
    Hunterworks prototype sheave with easy cleanout port, 22 gram HV weights
    Weller Racing ECU flash
    HMF Titan Series Quiet slip-on Exhaust
    Walker Evans shocks
    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
    Tinkseal additives
    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
    OEM skid plates
    OEM rock sliders
    OEM A-arm guards
    OEM cargo box
    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

  10. #9
    Moon Shiner Scurvy's Avatar
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    Fuel tank vent? Maybe try to recreate the issue with the cap loose/removed.

  11. #10
    Super Moderator MassiveOverkill's Avatar
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    I don't think so. Too cold right now and gas tank was half full.
    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
    Over 6000 miles and 425 hours
    Hunterworks prototype sheave with easy cleanout port, 22 gram HV weights
    Weller Racing ECU flash
    HMF Titan Series Quiet slip-on Exhaust
    Walker Evans shocks
    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
    Tinkseal additives
    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
    OEM skid plates
    OEM rock sliders
    OEM A-arm guards
    OEM cargo box
    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

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