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Flames out the Exhaust

Discussion in 'CVP Stage 1 Tuners Kit' started by Sporty01, Apr 28, 2010.

  1. Sporty01

    Sporty01 New Member

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    First off I am new to the site and enjoying it very much. Having an issue with my exhaust and think if might be carb issues, this is probably going to be a little long to explain everything. I have a 01 FXDWG and have had it for about 4 years. the previous owner said he had the carb jetted but don't know how much, it has a python exhaust that I took the baffles out and installed torque cones. The one issue I have always had is that after it was warmed up and I would stop to get gas (or just a quick 5 min stop) and started it back up black smoke would role out the exhaust, but if it sat for at least 10-15 min it would start just fine with no smoke and always thought it might be a little lean. I have also added a cone airfilter last summer. About a month or so ago it started popping and shooting out blue flames and found that the welds broke on the lip of the exhaust that the clamp presses up into the heads, so I had the fixed and it is still shooting out a blue flame when I down shift and let the engine slow the bike down. I have just ordered the Stage 1 kit with the EZ adjuster screw. Will this fix the problem or is there something else that I should be looking at as well? Thanks in advance.
    Sporty
  2. Sporty01

    Sporty01 New Member

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    Well I just used carb cleaner to check for intake leaks with the bike at about 1500 RPM's and there was no change in the idle. When I turned the idle mixture screw all the way in and then turned it out nothing changed in the idle at all. So is that telling me that it is running to lean? Could this be the cause for the popping of the exhaust and shooting out flames?
  3. hotroadking

    hotroadking Super Moderator Staff Member

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    I am guessing it's way too rich with the black smoke.

    My suggestion is to put he baffles back in, taking them out doesn't do you
    one bit of performance good, just makes the bike obnoxiously loud, and while
    you may think it's cool as you hammer it down the road, everyone around
    you thinks it's wrong...

    and it just brings more laws down on us re exhaust.

    TQ cones do nothing much, not that I've ever seen. Dump them put the baffles in
    and then get to tuning.

    What jets are in the carb pilot and main, you'll need to turn off the fuel, drain the bowl and remove it,

    Because it has black smoke and you can turn in the adjuster all the way without
    any difference I would venture the bike is running way too rich.

    the flames/popping on downshift are unburnt fuel hitting the hot headers as the bike decelerates, pulls fuel into the cyl and it's dumped out the exhaust...

    drop the pilot one size, put in the baffles, dump the tq cones (or not up to you) and set the adjuster screw, get it close or right before you start doing any more to the carb.. JMO>
  4. Sporty01

    Sporty01 New Member

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    HotRoadKing, Thanks for the advice. I have actually been thinking about putting the baffles back in, for the reason of the attention especially out here in Cali. Now I am just waiting to get the Stage 1 Kit to get her running the way she should be. Thanks again
  5. hotroadking

    hotroadking Super Moderator Staff Member

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    I would go ahead and baffle it,

    Also you need to drop the bowl and find out how it's jetted or
    you'll be putting the kit in and then maybe still running out
    to get another jet,
  6. HarleysLR

    HarleysLR Active Member

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    I agree with HRK 100%. !!
    If you ever watch NASCAR you'll see them shooting flames out the exhaust, raw fuel being sucked into the exhaust manifold on decel. looks cool but this an't nascar.
    you need to get dialed in before puting in the new carb kit, other wise you will be wanting to blame the new kit for not working correctly. the new kit will just improve upon the correct settings and jetting. it wasn't meant to be a fix all for a poor set up. JMO!!
  7. Sporty01

    Sporty01 New Member

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    I am completely with the both of you on this. But, the one question I have is what would have made it start shooting out the flames as of a month or so ago? I have had the baffles out of the pipes for about 4 years now and it has never shot out flames and I put the cone airfilter on about one year ago. That is why it has my mind boggled on why or what has cause it to shoot out flames just recently. Trust I do like the loud sound, and hate the flame popping with a passion. Any thoughts?
  8. cowboy

    cowboy Moderator Staff Member

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    sound's like it's sucking air right into the head from the exhaust port the cold air will mix with the hot air& unspent gas & cause a pop/flame . also how do the spark plugs look & how old are they ?
  9. kenfuzed

    kenfuzed Administrator Staff Member

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    Also check that your float level is ok and that the float needle (plunger) is still sealing. Since you mentioned that this suddenly came on without any changes made it is possible that excess fuel is washing down into the intake and becoming ignited in the exhaust. A check of the plugs is where I'd start.
  10. hotroadking

    hotroadking Super Moderator Staff Member

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    Also the exhaust manifold might not be sealing to the head, new gaskets
    might be in order.


    JMO put the baffles back, tune the carb and it will pickup a lot more
    street power, straight pipes are for the track not the street.

    IF you MUST run them un-baffled put the lollipops in the muffler, it's an old trick that works well:

    1) if a cop wants to hassle you on loud pipes with no baffles you get
    the night stick up the pipe and a big ticket.. lolly pop will stop that
    2) the lolly pop will help create the pressure waves you need
    to improve the savaging of the pipe (pulling of old exhaust gases out) and new mix in
    resulting in more power

    What you do is get a threadded rod, weld a small round flat washer with a hole to the end of it, it should be no greater than 1/3 the diameter of the exhaust, put a nut on it, run the threaded rod down through the baffle mount hole, and put a nut on the outside

    now you can adjust the height to center it in the exhaust, remember locktite is your friend.

    do both mufflers and you'll see a good gain, put it on a dyno and you'll see the numbers improve.
  11. hotroadking

    hotroadking Super Moderator Staff Member

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    Found a drawing of the lollipop for you

    [​IMG]
  12. Sporty01

    Sporty01 New Member

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    Thanks for all of the suggestion and I took almost all of them into consideration. I just installed the Stage 1 kit this past weekend with a 48 and 195 according to the table in the instructions, couldn't tell what the old ones were but looked to be 48 and 190. The old slide needle was on the 3rd notch and also had 3 washers, so I think that is where my main problem was at with the way the carb was set up. With the new kit throttle response is awesome. I rode it three times after installing the kit and had to do some fine adjustments to get the idle just right, I am sitting at about 3 1/8 turn out. But each time I rode her it was for about 20 - 30 min and at least once during each ride it would cough but couldn't tell if it was coming from the carb or exhaust, but it sounded like an air fart and it would only happen when coming to a stop and down shifting from 4th to 3rd. Any ideas? As far as the exhaust goes I still have the popping and flames but not as bad as before the carb kit, I was going to put in the baffles but I guess I through them away so now looking at either 2 into 1 Rineharts or Hooker Rebels, any thoughts? I replaces the exhaust gaskets and there doesn't seem to be a leek, but could the clamps be bad and not keeping pressure on the headers inside the head. I do appreciate all of you helping me with this issue. Thanks
  13. HarleysLR

    HarleysLR Active Member

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  14. Sporty01

    Sporty01 New Member

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    Anyone else have any suggestions? I am going to order those baffles from big Thunder.
  15. FLHTbiker

    FLHTbiker Moderator Staff Member

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    I had a set pf Sampson pipes with a lolly pop baffle in them, worked fine.
  16. HarleysLR

    HarleysLR Active Member

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    I have a set for 2" pipes if your interested PM (Private Message) me. $50.00 you pay shipping.
  17. Sporty01

    Sporty01 New Member

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    Loving the CV Performance Stage 1 kit, not only do I feel the throttle response, but my gas mileage has improved greatly. Still trying to get it adjusted right though, when it is cold I will get a little cough out of the carb. So still trying to get that adjusted just right by the EZ adjuster. But I don't think it will be perfect until I get the new exhaust on. Just purchased a set of brand new Supertrapp Mean Mothers off ebay for a steal of $112 couldn't believe I got them for that. Once I get the pipes then I should be able to adjust the carb to where it needs to be. Anyone have any experience with the MeanMothers good or bad?
  18. cowboy

    cowboy Moderator Staff Member

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    that's good news , just keep trying on the carb , but just barly move it then try it & once you get the new pipes on you'll need to move it again good luck & lus know how it all comes together
  19. hotroadking

    hotroadking Super Moderator Staff Member

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    Meanmothers are good pipes...
  20. Sporty01

    Sporty01 New Member

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    Received the new pipes and they were just the Supertrapp mean mothers drag pipes and didn't have baffles in them. So I went ahead and put them on and they sound great, there are not any flames and no popping. But I am still getting some coughs through the carb when she is cold. I am thinking of getting the Big City Thunder baffles to give it something, but I also found these baffles by Sampson in the J&P Cycle catalog that are about three inches long and have a rod welded in the center of them. Would these work the same as the Big City Thunder ones?

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