Hot!08 honda rancher 420fm problems

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Hondarancherprobs
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2019/09/24 16:43:44 (permalink)

08 honda rancher 420fm problems

so ive had this bike for awhile now and its just been one big wild goose chase. hoping someone here might have some advice or ideas to get me going on this project again. so heres what it does. it starts up easy. idles perfect and will idle all day if i let it. if i feather the throttle i can rev it all the way out. however if i jab the throttle or put to much load to fast it will starve itself and die. heres what ive done so far to it since i bought it. 
new: wiring harness
fuel pump/filter/regulator
fuel lines from tank to pump and vent line from pump back to tank
weisco top end
fuel injector 
throttle position sensor/map sensor
fuel tank cap (just in case)
air filter
oil change and filter
new  NGK spark plug 
new ignition coil
and cleaned inside of throttle body about 4 times now 
 
where im at now is ive been testing all wires and connections and i found my idle air control valve (IACV) might not be working. its getting voltage when the the key is on but when the bike is running and i unplug the IACV there is no change to idle or any other changes. the bike will still idle perfect and then fall on its face when the throttle is jabbed. i plan to replace it regardless but i am doubtful that this has anything to do with above idle conditions. 
also the valves are a little out of adjustment because i can hear them slightly ticking as the engine runs but i the previous owner stripped the caps off of the valve cover to get to the rocker arms to adjust them so i havent done that yet. but again them being slightly loose i dont see that affecting the bike as much as it is when given alot of throttle. 
im at a real big stand still and dont know where to even go from here. ive shorted out the dummy connector and tried to bring up old codes but that didnt work. ive cleaned every connection on the bike. its getting good spark. the vent lines for the fuel pump and tank are clean and clear. even tried running it with the gas cap off. still no change. fuel pump runs from when you turn the motor on to when the engine dies. ive sprayed every where with carb cleaner to search for vacuum leaks and didnt find any. any advice or ideas on a direction to go from here would be greatly appreciated. ive read some forums about people having the same problems and doing the same things ive done to try to fix it with no luck but of course people hardly ever post what their solution was once they fix the problem. 
 
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    00_NUTT
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    Re: 08 honda rancher 420fm problems 2019/09/24 19:56:57 (permalink)
    Dang man you changed about everything. I'd say maybe you have an air leak somewhere but not sure. Like when idling and slow to wot it stays closed but when you goose it something opening up. Also have you pulled and checked the screen on the petcock? As for as the IACV that's normal for just about any fuel injection. The computer stored the last reading so it keeps that info. Also you don't have any soft fuel lines that might collapse under a quick draw and then it would starve the bike until it dies and pressure from the fuel injection is released and the line opens back up? Man you have a weird issue especially since you basically rebuilt the bike and I'm just thinking of the off the wall issues. Hey one more thing. I keep reading your post trying not to say what you already tried. But did you change the mass air flow sensor? They do not like carb cleaner. So it may be malfunctioning

    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
     
    #2
    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/24 20:31:01 (permalink)
    I appreciate the quick response. I put a new petcock on it but could’ve messed it up when putting it together so I’ll check that again. But as for the Mass air flow sensor the symptoms for a malfunctioning one or bad one is exactly what my bike does, however doing some searches I don’t think the 08 rancher has one. All I’ve found is an Air tempature sensor which sounds to me to be the same thing. Might be worth a look into but then again at this point everything is worth looking into
    #3
    00_NUTT
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    Re: 08 honda rancher 420fm problems 2019/09/24 20:33:08 (permalink)
    Man I try. Willing to always lend a helping hand. I'd try the sensor for sure. You changed everything else and not much left.

    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
     
    #4
    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/24 20:35:36 (permalink)
    There is a guy on here named gotmuddy that I made this account to PM because he has a thread with the same bike and same problems a few years ago but these forum rules makes me wait 14 days to be able to PM anyone lol I wish he would’ve commented at the end and say if he got it fixed or not
    #5
    00_NUTT
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    Re: 08 honda rancher 420fm problems 2019/09/24 20:36:42 (permalink)
    Man look him up on Facebook. Gotmuddy reductions I believe.

    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
    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/24 20:48:04 (permalink)
    I did. It seems like he hasn’t used that Facebook for a few years either. Just my luck haha
    #7
    00_NUTT
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    Re: 08 honda rancher 420fm problems 2019/09/24 20:49:24 (permalink)
    Let me see if I can get ahold of my buddy for his personal Facebook or his number for you.

    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
     
    #8
    toodeep
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    08 honda rancher 420fm problems 2019/09/24 21:18:13 (permalink)
    You rebuilt the top end and didnt set the valve tappets? Was the head gone through and valves and seats checked? Maybe I missed the history of the machine but why was so much work done to it?

    Sent from my SM-G975U using Tapatalk

    #9
    00_NUTT
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    Re: 08 honda rancher 420fm problems 2019/09/24 21:24:32 (permalink)
    Thanks for getting in on this toodeep!!!

    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
     
    #10
    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/24 21:46:42 (permalink)
    Toodeep the history is I bought this bike not running. The dude said all it needed was the wiring harness due to mice chewing on it at his deer camp where it’s sat for the last three years without running. I call **** because the shift forks were broken, other parts were simply taken off and the wiring harness was clean cut and didn’t have any bite marks but I was late to work so I took his word for it and loaded it up. I put the new head on it because when I replaced the the shift forks the piston had some wear on it and I just went ahead and replaced it with a weisco before it damaged any more. Once I replaced the wiring harness and all the parts that were missing it finally cranked and that’s when I heard the ticking noise. I’ve got the feeler gauges to adjust them but the caps on the valve cover are rounded off and even vice grips won’t take them off now. I’m ordering a new valve cover to be able to do the adjustments before riding it. (If it ever runs like it should) I cleaned the valves and checked the seats while I was there but might not have done a good job. Once I get the new valve cover I’m going to take it to a shop to get professionally gone through and re-seated. Could this be the problem? I was told by multiple shop mechanics that it most likely wasn’t but still needed to be adjusted. Most of the other work and new parts that’s been done to it is me chasing a wild goose and trying to replace most common issue parts to try and fix the problem
    #11
    toodeep
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    08 honda rancher 420fm problems 2019/09/24 22:21:41 (permalink)
    Valves can be a government and take on issues. As far as the valve caps, a few taps with a hammer should break them free enough to remove them and just replace the caps. Have you tried another sparkplug since the start of the repairs? I've had a few come in that would just spit and sputter when giving it throttle and it was just a bad "new" plug.

    Sent from my SM-G975U using Tapatalk

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    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/24 22:24:30 (permalink)
    I’ll try a new plug tomorrow. As for the few taps to break the caps loose I’ve tried more than a few and more than a tap and still no luck there
    #13
    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/25 20:29:32 (permalink)
    So I cleaned my air box sensor and found a loose connection on one of my wires. After both the bike actually runs a lot better. I can get it to rev up by jabbing the throttle some times. Other times it will bog out and die like it usually does. Atleast making some headway now. Pulled spark plug and it looks a bit fouled so going to replace that tomorrow and see what that does. I tried resetting my DCT like the manual says to short out the dummy plug, turn the key on and short out the ECT sensor so it resets the computer but it just keeps popping fuses. Granted I’m not using the “special tool” that Honda wants me to but to me all it looks like is a plug with a jumper wire and I’m using basically the same setup at home. I was hoping to reset the bike so I could see if it popped any old codes that may have been stored in the memory. Also pulled fuel hose from petcock to make sure I’m getting a steady stream of fuel and I am. Seems like this is all coming down to electrical issues/ sensors/ cleaning. Hopefully I’m right. As for the valves making a ticking sound, I just happened to place my weight on the aftermarket back seat while it was running and found out that ticking was coming from the seat and not the engine. Crazy how I tend to overlook things and diagnose them way to fast.
    #14
    00_NUTT
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    Re: 08 honda rancher 420fm problems 2019/09/25 21:31:16 (permalink)
    Man looks like you got it narrowed down. Now just to get it all to come together.

    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
     
    #15
    Jeepwm69
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    Re: 08 honda rancher 420fm problems 2019/09/26 11:29:06 (permalink)
    You sure you have good clean gas?  I know that's a simple thing but gas these days is garbage.
    #16
    00_NUTT
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    Re: 08 honda rancher 420fm problems 2019/09/26 11:36:49 (permalink)
    You ain't lying Jeepwm69

    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
     
    #17
    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/26 12:11:19 (permalink)
    Jeepwm69 I’ve got a brand new fuel can with brand new premium gas in it but it is kinda suspect though. My lawn mower that I use the same gas from the same can started acting up today too. Might be worth looking into
    #18
    Jeepwm69
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    Re: 08 honda rancher 420fm problems 2019/09/26 15:24:21 (permalink)
    Wouldn't it be nice if that was the problem though?  LOL
    #19
    Hondarancherprobs
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    Re: 08 honda rancher 420fm problems 2019/09/26 16:59:34 (permalink)
    It would’ve haha might run some sea foam through it just in case
    #20
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