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Need your opinion

Discussion in 'Motorcycle Tech Talk' started by CVOLEO, May 31, 2012.

  1. CVOLEO

    CVOLEO New Member

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    My son is the proud owner of a 2005 Sporty 883 Low. We decided to put a set of V&H straight shot slip ons on. Before we went down the rejet road, we did extensive research of the pros and cons of rejetting after new pipes were installed.

    So we installed the pipes and decided to see how the bike ran before we touched the carb or filter. (I have a K&N filter and a 44 and 46 pilot needle in reserve). The bike runs great without any carb or filter modifcations.

    So here's the question. Is there anything to be gained by adding the K&N and potentially rejetting the carb or am I better off leaving well enough alone.

    BTW, I'm from the old school that if it's running right, leave the tools in the toolbox.

    Input is appreciated.
    CVOLEO, May 31, 2012
    #1
  3. Red Rider

    Red Rider Well-Known Member

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    The K&N will increase the air volume throughput, so given that you already have the slip-ons it may run a little leaner. That increase allows for more energy to be available more quickly - AKA, more horses. But if you don't want the power, you can just leave it as is.

    Frankly, I wouldn't have put new pipes on it just for the look/sound, but that is an individual thing.

    It sure wouldn't hurt to have the kid learn to tune his bike, though.
    Red Rider, May 31, 2012
    #2
  4. Lucifer

    Lucifer Well-Known Member

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    If it's a stock replacement K&N filter in the stock breather,gains would be minimal, mixture screw might take another 1/4 out...
    If it's running good and he's happy with the performance as is...I'd leave it alone....Have fun:D
    Lucifer, May 31, 2012
    #3
  5. CVOLEO

    CVOLEO New Member

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    Thanks guys!
    CVOLEO, Jun 1, 2012
    #4
  6. chucktx

    chucktx Moderator Staff Member

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    if you just do the pipes, or aircleaner you should not have to mess with jetting. if you replace both then you will need to address the carburator. the reason is you are letting more air in and more air out. as it stands you are still admitting the same amount of air. these bikes run border line lean from the factory. any changes to the airflow will make it too lean and start problems you dont want to fix/payfor........
    chucktx, Jun 1, 2012
    #5
  7. prodrag1320

    prodrag1320 Active Member

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    a free`er flowing A/C will really help with performance,and anhance the addition of the pipes,dont worry about re-jetting,its no big deal
    prodrag1320, Jun 2, 2012
    #6
  8. chucktx

    chucktx Moderator Staff Member

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    not true........it will make the bike run leaner= hotter! pipes will blue and you could burn pistons, valves, ect........
    chucktx, Jun 3, 2012
    #7
  9. Lucifer

    Lucifer Well-Known Member

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    Heh, chuck I think what prodrag meant was that re-jetting is no big deal...not that he wouldn't need to re-jet if he went with a free flow breather kit....
    Lucifer, Jun 3, 2012
    #8
  10. bikerstud

    bikerstud Member

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    So, we're all in agreement that in the vast majority of cases, it's necessary to re-jet the carb when freer-flowing pipes and air cleaner are used.
    bikerstud, Jun 3, 2012
    #9
  11. Lucifer

    Lucifer Well-Known Member

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    Yep...if you leave the stock air box on and just replace the air filter...you probably won't have to re-jet...free flowing air cleaner kit like the SE breather,Ness Big Sucker or similar,you'll need to:)
    Lucifer, Jun 3, 2012
    #10
  12. JohnnyBiker

    JohnnyBiker Well-Known Member

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    Now that we got that situated. :D
    JohnnyBiker, Jun 4, 2012
    #11
  13. hotroadking

    hotroadking Super Moderator Staff Member

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    Yes and no

    What a lot of people don't know is that the EPA regs don't apply to WOT
    so HD doesn't have to generally skim on the WOT jet or main jet.

    Where you run into issues is the Needle or Pilot Jet and generally you can
    fix them with simply uncapping the Federal Imperial Governments Anti Tamper
    Gas/Air Screw Plug Cap.

    Just drill a little hole, pop off the plug cap, turn in the screw VERYVERY VERY LIGHTLY
    you jam it down you'll fubar the base in the carb. Once it touches turn out 2.5 turns.

    Start, get it warm, hold RPM at 1500 and Turn in counting turns until it stumbles, now turn out it should improve, keep going until it stumbles, then go back 1/2 turns.

    Ie you turn it in 2 turns, then out 4, go back 2. Thats the sweet spot.
    hotroadking, Jun 4, 2012
    #12

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