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Honda FourTrax Discussions for the FourTrax Rincon, Foreman, Rancher, Recon

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Old 05-21-2010, 06:45 PM   #1 (permalink)
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Knocking noise?

I have an 07 foreman s with 500 miles 100 hrs the motor seems to make knocking noise at idle and hear at slow speeds. motor runs really good i have changed oil in front diff, engine oil just changed. 4x4 works fine but bike doesnt have to be moving to hear it. it knocks in neutral at idle no problems other than noise. all stock no mods what so ever. any ideas? i dont think is rod bearing but dont know how to check without splitting cases.
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Old 05-21-2010, 07:27 PM   #2 (permalink)
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You can't check the rod bearing without splting the cases, does it sound like the top or bottom of the motor?
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Old 05-21-2010, 07:42 PM   #3 (permalink)
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cant really tell it seems to be more from right but not sure if from top or bottom hard to pin point.
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Old 05-21-2010, 07:53 PM   #4 (permalink)
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Does the knocking noise go away when you gas it or can you still here it?
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Old 05-21-2010, 08:19 PM   #5 (permalink)
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all i can hear is engine noise during throttle i have ridden it at top speed 56 mph for couple miles does fine no noise but under 20 mph and idle it is defined and steady knocks or pops i have jacked it up once all four wheels 2wd and 4wd 30mph top couldnt hear anything put it on ground and it starts again at 2mph really has me confused ithink it is motor but idk. first thought it was 4wd that is y i changed frony diff oil but no change all shafts are tight
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Old 05-22-2010, 04:48 AM   #6 (permalink)
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You really need to try and isolate the noise to see what part of the engine it's coming from. You can use a piece of pipe or a short piece of garden hose held to your ear and with the other end move it around on the engine to see if you can find the noise.
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Old 05-22-2010, 04:49 PM   #7 (permalink)
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i really believe the noise has something to do with the tranny. doesnt slip or stall just a knocking or popping sound seems to be getting louder or i may pay more attention to it since i have heard it now.
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Old 05-22-2010, 07:10 PM   #8 (permalink)
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Welcome to the forums.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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Old 07-16-2010, 08:47 AM   #9 (permalink)
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I had a knocking in my '01 Recon and took it apart and found the cam chain was loose and the oil pump chain was off! With the oil pump chain being off and running the quad, I think we messed up the bottom end. Don't run it long if it's knocking. You might be doing more damage than you think.
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Old 07-22-2010, 10:38 PM   #10 (permalink)
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you could have a bad cv joint..thats if it's not the motor thats making the noise ?.
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