2006 CRF150F Running...weirdly
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    2006 CRF150F Running...weirdly

    by James Addiction » Wed Mar 12, 2014 6:11 pm

    I posted this over at Thumpertalk:

    "My wife's bike is acting strangely. It starts easily, it warms up smoothly, it idles pleasantly, and it rides ok... except that it doesn't ride ok. If the throttle is twisted past about 1/4 of its full travel the engine starts to chug. It's like hitting a rev limiter, but the RPMs don't matter. If the throttle is backed off until the chug is gone, the bike will accelerate smoothly if slowly. I got it into 4th gear just to see if I could.

    So that's the thing. It works completely normally unless the throttle is twisted too far.

    I have checked the entire fuel system to include the petcock, hose, and fully dipped and sprayed the carb.
    I have a fresh clean air filter and a shiny new spark plug.
    I checked valve clearance and found the exhaust to be a bit wide. I adjusted it to specs but no change to performance.
    Fuel is fresh, with a hint of stabilizer in it.

    Only thing I don't know how to check is the coil and the ICM. I have a manual and it shows a special add-on device for a multimeter [not available in the US, and a $600 device] to read peak voltage.

    I don't know if float level would have anything to do with this problem, but the spark plug looks correct - not too lean or rich.

    I'm out of ideas."

    I was given the tip to nip off a bit of the spark plug lead and screw the cap back on. I did that but nothing changed.

    So, I'm thinking coil. Agree? Disagree?
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • Aussiecrf230
    Posts: 1962
    Joined: Fri Jan 06, 2006 11:11 pm

    by Aussiecrf230 » Thu Mar 13, 2014 1:57 am

    Make sure the needle is still in it's clip.

    Check your electrical connections and make sure coil is earthed properly too.
    Ray
    Australia

    CRF230F 2004
    C30F Power Up needle
    Mains 132
    Idle 45
    2 turns out
    Baffle out, Screens In

    It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    by James Addiction » Thu Mar 13, 2014 10:28 am

    The needle, I'll check that right away.

    Connections. I guess pulling them off and shining them up might do the trick. I'll give it a go today.
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • Aussiecrf230
    Posts: 1962
    Joined: Fri Jan 06, 2006 11:11 pm

    by Aussiecrf230 » Fri Mar 14, 2014 12:14 am

    A peak voltage adapter only costs a few dollars to make.
    So if you are handy with a soldering iron you can do it yourself. You will need a multimeter with a high input impedance, most are, but worth checking to start with. At least 10 Meg Ohm should do it.
    Just make sure your electrical connections are clen and tight, no corrosion. Earth points on frames should not have paint where the connector faces bolt to it.
    Ray
    Australia

    CRF230F 2004
    C30F Power Up needle
    Mains 132
    Idle 45
    2 turns out
    Baffle out, Screens In

    It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    by James Addiction » Fri Mar 14, 2014 10:51 am

    Needle is fine. I was hoping it'd be that simple.

    Where can I find plans for a peak voltage adapter? I ask this without having searched online for plans yet.

    Still have yet to check all connections. I do notice that the front tire tends to throw crud up right onto the electrics. Gotta take it apart again, but screw it...maybe tomorrow.

    I want to ride today.
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • NW_Rider
    Posts: 4
    Joined: Fri Mar 07, 2014 7:20 pm

    by NW_Rider » Fri Mar 14, 2014 10:46 pm

    I know you said you cleaned the carb, but did you inspect the jets VERY carefully? Sounds like the symptom of a partial plugged Main Jet. I use to do quick cleaning, but found I would miss the dirt sometimes. I now run a wire in the jets to make sure they are clear. Wish you luck.
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    by James Addiction » Sat Mar 15, 2014 6:19 pm

    Very thorough carb clean. I used Berryman's Chemdip, soaked it good for several hours. Sprayed carb cleaner through ports, and then blew with compressed air. Looks brand new.

    I've had others suggest the BBR Rev Box to replace what is likely a damaged ICM.
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • Aussiecrf230
    Posts: 1962
    Joined: Fri Jan 06, 2006 11:11 pm

    by Aussiecrf230 » Mon Mar 17, 2014 5:20 am

    Just reread your original post.
    Is this a new problem and what was done before it occured?

    Do you have good fuel flow to the carby?
    Sounds more like classic fuel starve.

    If fuel flow at the hose at the carby end is OK then pull the float bowl and make sure no gunk blocking the needle and seat. Check float height too. Check the main jet whilst your in there. Does this bike have a CV carby?

    Are all the vent tubes clear and clean?
    Ray
    Australia

    CRF230F 2004
    C30F Power Up needle
    Mains 132
    Idle 45
    2 turns out
    Baffle out, Screens In

    It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    by James Addiction » Mon Mar 17, 2014 4:24 pm

    The last time the bike was used we had no issues. That was September. I suspected fuel clogging; it's happened before. Easy to clean, but it didn't look too shabby.

    Fuel flows profusely when the carb bowl drain is open. Gets plenty of air. I've even tested for vacuum leaks even though I don't think them likely.

    It's just gotta be electrical. I have not yet cleaned connection points. The wind is 35mph today and my garage is the great outdoors.
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    by James Addiction » Mon Mar 17, 2014 4:32 pm

    Oh yeah, and no it's not a CV carb - the kind with the rubber diaphragm in the top, right? Nah. It does have a valve - air stop valve? - I've checked that little biscuit and its lines.

    There aren't any other vent hoses on the thing except on that hides up under the gas tank. Checked it.

    Wait, did I check it? I can't remember. I'll add it to the connection cleaning.
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    by James Addiction » Mon Mar 24, 2014 5:39 am

    Hoses are fine. Connections cleaned.

    BBR Rev Box changed nothing. Oh, well, it does pull harder from a stop, but still hits the same dead-zone in the throttle.

    I could swap the coil with an aftermarket one and still not have paid as much as taking it to a shop.

    I dunno... would the alternator cause anything like this?
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • James Addiction
    Posts: 10
    Joined: Sun Oct 24, 2010 7:50 pm

    by James Addiction » Sat Sep 06, 2014 8:36 pm

    I didn't mean to leave this thread hanging, but I didn't fix the problem until today.

    Here's the lesson learned: There is no shortcuts to cleaning a carburetor. My previous cleaning obviously missed something. It still ran crappy.

    I gave the carb another cleaning today, because the coil and the CDI didn't change anything. The cleaning was the difference between eating off of it and doing surgery with it; I was very, very thorough.

    Put it back together, fired up without choke (like it should in the summer) and ran stellarly.

    My inexperience cost me some money but still not as much as if I took it to the $hop. I have a spare coil now. Anyway, thanks for the tips and advice. I have learned a ton.
    James Addiction
    2008 CRF 250 X
    2006 CRF 150 F (Wife's)
    2006 GSX 600 F Katana
    2005 CBR 600 RR (it's an entirely different kind of flying, all together)
  • Aussiecrf230
    Posts: 1962
    Joined: Fri Jan 06, 2006 11:11 pm

    by Aussiecrf230 » Mon Sep 08, 2014 2:18 am

    Glad you got it sorted and thanks for posting the result.
    Ray
    Australia

    CRF230F 2004
    C30F Power Up needle
    Mains 132
    Idle 45
    2 turns out
    Baffle out, Screens In

    It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas

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