Hot!07 Grizzly 700 Popping and Backfiring

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36racin
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2019/04/22 10:32:28 (permalink)

07 Grizzly 700 Popping and Backfiring

New problem with the 700. Went to camp to ride and bike started running like it was running bad. Engine stumble, pops and backfires at lower RPM's but better at WOT. Bike will not idle...I have to keep some throttle in it to keep it running. All the while popping and backfiring. Checked the stator for bare wires against the engine mount. Checked all legs of stator for ohms and voltage. Ohms ok...Voltage reading around 5-6 volts...Should this be higher? But bike was popping and backfiring with stator disconnected from voltage regulator. Odd thing is on several occasions while trying to get bike back to truck it just all of a sudden started running good again and then would start running bad again. Almost like a grounded out wire somewhere. Attempted to wiggle the wire harnesses around some while riding but nothing. From cold start this morning it ran perfect then about 20 seconds later it started the issue again. Any suggestions
post edited by 36racin - 2019/04/22 12:14:15
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    Shadowmaker
    Mud Pro
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    Re: 07 Grizzly 700 Popping and Backfiring 2019/04/22 16:42:27 (permalink)
    Plug ok? How old is the gas? Valves need adjusting?

    05 Grizzly- 27" Bi/Tri Claws on type 5 ITPs.warn bumper, K&N filter,Supertrapp muffler00 Kodiak 400-26" mudlites,3.0 Warn winch
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    00_NUTT
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    Re: 07 Grizzly 700 Popping and Backfiring 2019/04/23 19:19:08 (permalink)
    Sounds like it's in the fuel system. Like some trash got in it somehow. Try changing your fuel filter and run some Seafoam through it.

    00_NUTT
    1997 Honda 300 4x4
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    54% gear reduction
    Honda 350 rear axle assm.

    6" BPC CUSTOM LIFT WITH 8" STRETCH AND 3" BODY LIFT OLD 300 LOOKING GOOD AS EVER THANKS TO WHITNEY!!!!!

    SON'S BIKE
    1998 Honda 300 2x4
    6" BPC LIft with some sick a-arms
    420 spindles and disk brakes
    29.5" OL2'S
    14" MSA M26 Vibes
     
    Upcoming
    4x4 Frame and Motor that's here now just got to get to work on the swap over!!!
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    36racin
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    Re: 07 Grizzly 700 Popping and Backfiring 2019/04/25 20:12:48 (permalink)
    Bike has about 50+ miles on it since valves were adjusted, fuel tank removed, new sock installed on fuel pump.  No fuel filter that I'm aware of.  New plug when work was done.  Another new when problem started the other day.  I was thinking it was fuel injector or crank position sensor related.  But has aftermarket CPU so I'm not getting codes on display panel.
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    36racin
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    Re: 07 Grizzly 700 Popping and Backfiring 2019/04/25 20:14:34 (permalink)
    Only other work done in last few months is purple spring, shims and new belt.  Bike was running good until this past weekend.
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    00_NUTT
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    Re: 07 Grizzly 700 Popping and Backfiring 2019/04/27 23:38:04 (permalink)
    Man I went and re-read your post and thought about it. I think you have an efi problem. Something is telling the fuel system some faulty info. Could be a faulty sensor.

    00_NUTT
    1997 Honda 300 4x4
    Head Ported and Polished
    317 Kit
    Big Red Cam
    Clutch Kit
    SuperTrapp IDS2 Exhaust
    K&N Filter
    Carb Kit
    32" Interco Interforce II's
    16" MSA M30 Trottles
    Snorkled 
    54% gear reduction
    Honda 350 rear axle assm.

    6" BPC CUSTOM LIFT WITH 8" STRETCH AND 3" BODY LIFT OLD 300 LOOKING GOOD AS EVER THANKS TO WHITNEY!!!!!

    SON'S BIKE
    1998 Honda 300 2x4
    6" BPC LIft with some sick a-arms
    420 spindles and disk brakes
    29.5" OL2'S
    14" MSA M26 Vibes
     
    Upcoming
    4x4 Frame and Motor that's here now just got to get to work on the swap over!!!
    54% Gear Reduction
     
    #6
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