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spitting and sputtering at 3200 - up RPM

Discussion in 'Fuel / Air' started by Champballkiller, Sep 12, 2016.

  1. Champballkiller

    Champballkiller New Member

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    2005 Ridgeback 117 Super G Vance& Hines Big Shots Spike air cleaner #78 main jet RIP Upgrade
    Bike spits and sputters at high RPM (3000 - up) good power up to that point. Anybody got any suggestions.
     
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  2. dentdude36

    dentdude36 Guru

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    How long have you had the spike on? Make sure the bowl vent is taken out, it's necessary when changing from an s&s intake
     
  3. Brew

    Brew Troop Supporter

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    Which way is your cone pointed? If forward that could be the cause, a lot of folks point their spikes up!
     
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  4. dentdude36

    dentdude36 Guru

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    I've got mine pointed forward and it never misses a beat runs perfect but I know some had trouble with it forward
     
  5. Brew

    Brew Troop Supporter

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    Mine is pointed forward also and runs fine. I'm running a 31 and 78 for jets.
     
  6. dentdude36

    dentdude36 Guru

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    That's what I'm running , it did hesitate at first when I first put it on cuz like a dumbass I was unaware of the bowl vent, removed that and never sputtered again
     
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  7. HMAN

    HMAN Well-Known Member

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    Check the rubber caps on top of the carb. They dry rot and leak.
     
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  8. blacktopper

    blacktopper Active Member

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    Did you recently clean and oil your air filter?
     
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  9. Champballkiller

    Champballkiller New Member

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    Thanks for the replies.... the spike is pointed forward and the bowl vent removed. I will check the caps. Have not recently cleaned the air filter. I have adjusted the carb and it doesn't pop and backfire on decel or anything like that. I just can't get it to wind up with full power before i shift. Could the ignition box have an issue?
     
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  10. dentdude36

    dentdude36 Guru

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    Did you just install the spike? Or has the problem just begun?
     
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  11. Champballkiller

    Champballkiller New Member

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    Problem started after the bike was put back together after having the tank painted over the winter. I cleaned the screen on the petcock before putting it back in. I am getting plenty of fuel. I even mixed some 100 octane in with the 93 non ethenol to see if running cleaner fuel would help. I changed the plugs tonight too and I will see if that helps tomorrow. I will also turn the spike up.
     
  12. dentdude36

    dentdude36 Guru

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    Another possibility is the fuel cap vent may not be functioning properly
     
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  13. Champballkiller

    Champballkiller New Member

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    I had a flush cap that wasn't venting. I just installed a new cap from shoveheadkicker that vents properly, but have only test rode it twice since then. I think that might have caused some problems. I'm going to look at the vent caps tomorrow for sure.
     
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  14. cdogg556

    cdogg556 Guru

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    I had a spike on my 05 Bulldog and could never get it to run pointing forward, it would do the same thing up to 3000 rpm or so and then sputter and cough, just ran like crap, turn it vertical and it worked great, just didn't look good to me so it came off, went to the stock Big Dog and it looked and ran great. :old2:
     
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  15. blacktopper

    blacktopper Active Member

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    Just for a test clean the air filter with the solvent provided by k&n rinse it and let it dry and put it back on the bike with no oil on it and take it out for a short test ride.
     
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  16. Champballkiller

    Champballkiller New Member

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    Thanks for the help so far guys. I have changed the direction of the spike, adjusted the carb, cleaned the air filter, replaced the rubber vacuum cap on top of the carb, and replaced the plugs. The problem has moved down to the 2400 - 2800 rpm range now. Please help if you can, I've ran out of ideas. No matter whether I ease up through that rpm range or run hard through it, it still runs bad at that spot. could my ignition box be going bad? I only have a week to get this fixed. I'm headed to Myrtle Beach Bike Rally this weekend.
     
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  17. dentdude36

    dentdude36 Guru

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    Did you make sure the bowl vent is out? It's a small Allen plug on the bottom of bowl I forget which corner exactly
     
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  18. Champballkiller

    Champballkiller New Member

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    yes sir. did that when I first put the spike on. Bike ran fine this spring. Just started having problems after the bike sat a while.
     
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  19. nobbyjohn

    nobbyjohn Active Member

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    Hey guys I'm having about the same problem,the lower gears as you wind it up it has a flat spot but if you crank it up it doesn't miss.I recently added the spiked air cleaner, the problem that really concerns me is the front cylinder is running lean. I have a triple XXX carburetor and is the bowl vent plug on the inside of the carb .totally confused,which is a normal way of life for me!!!!


    Sent from my iPhone using Tapatalk
     
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  20. francoblay1

    francoblay1 The Spaniard

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    #20 francoblay1, Apr 18, 2017
    Last edited: Apr 18, 2017
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