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Advice on Jetting

Discussion in 'Motorcycle Tech Talk' started by IceFire, May 13, 2007.

  1. IceFire

    IceFire New Member

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    I installed a set of V&H Big Shot staggered pipes along with a Hypercharger on my 97 Heritage. Had the HD shop rejet the stock carb and it seems they may have over jetted it. When I am crusin around 120 kms especially up hill I can smell gasoline and also seem to be using more gas since they did the work.
    How hard is it to put a smaller jet in and how can I insure it is the right size ?
    Any help would be greatly appreciated !!
  2. Peyts

    Peyts New Member

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    Not sure about installing the jet kit on a Heritage specifically, but I am about to untake the rejetting on my Sporty sometime within the next week or so. I had a buddy of mine "demonstrate" it for me by "stripping" the bike (removed the gas tank, air cleaner kit and carb)... didn't really seem bad at all. The big thing to be careful of is nut stripping out the bolts and jets... I guess that it is not real difficult to strip them out. I bought the jet kit off eBay for like $20... everyone I have spoken to via eBay who bought and installed the jets have been BIG TIME impressed. Good luck, bro!
  3. chucktx

    chucktx Moderator Staff Member

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    if you have your service manual, it is a piece of cake to change the jets....it has pics and great explanation.....
    a readers digest condenced version.....remove the bowl on the carb, carefully remove the old jet and install the new one.....it does sound like you may be a bit on the rich side.....
  4. kenfuzed

    kenfuzed Administrator Staff Member

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    Most are able to pull the carburetor without removing the fuel tank, so that could save some time and hassle. Once you have the carb pulled off, rejetting is fairly straight forward. Following these Harley Carburetor Jetting instructions should get you going.
  5. IceFire

    IceFire New Member

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    Chucktx
    A 175 main was installed, do you know what a stock main is ?
  6. mwelych

    mwelych Active Member

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    Not sure but I think either 160 or 165 main is the right one...:)
  7. chucktx

    chucktx Moderator Staff Member

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    if i remember correctly, 165 was the stock one....
  8. kenfuzed

    kenfuzed Administrator Staff Member

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    Personally I don't think a 175 main jet is too large for your Evo Heritage, and a jet that size shouldn't have that much effect on mileage. The main jet kicks in between 3/4 to full throttle. If you are smelling gas and mileage is suffering that much then I suspect other problems. Could be the float level is set too high allowing fuel to be overflowing through the vent. Another problem could be the check ball in the accelerator pump nozzle is not seating, and fuel is being syphoned out.

    Have you checked your plugs yet for fouling?
  9. IceFire

    IceFire New Member

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    Yes, I changed out the plug's before my last run. Started to smell gas right after the shop re jetted it so it looks like the 175 main is the issue. I tried to lean it out a bit yesterday which caused it to sputter. What's your thought on installing a Stage 1 kit ? Heard this is the alternative to getting the stock HD carb back to where it should be, as HD had to follow emmission guide lines over the past years.
  10. kenfuzed

    kenfuzed Administrator Staff Member

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    On a typical 80" Evo a 175 main jet is not that big. You may find after changing it that you are still having the same problem. Just my theory, but as mentioned before I still think there is something else going on causing this problem.
  11. HarleysLR

    HarleysLR Active Member

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    Listen to Ken, he is right that the 175 jet is not to large, we have a 1990 EVO with a modified CV Carb and we run a 180 main jet and it get 50+ miles per gallon all the time. Ken knows his stuff, he modifys these carbs all the time.
  12. tinsin

    tinsin New Member

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    jetting

    I've re-jetted the carb on my dyna a couple of times trying to match it with the pipes I happen to have on. My 'gas smell' problem went away after removing a .030 shim off of my needle valve. I still have a .030 shim on it (nothing more than a very small washer) and the smell dissappeared, or isn't as bad. The main jet on my Kiehin is at 190 and the slow jet is at 45 and getting around 43-46 mpg. with Khrome Werks slip ons. All of that on a '01 TC.
  13. SkyKing

    SkyKing New Member

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    I don't really have anything to add for IceFire. For Chucktx I do:

    I have a heck of a hard time reading the posts that follow yours. I find myself staring at your Avitar, and waiting to see those puppies pop out. Damn good bra, I guess.

    :roflmao:
  14. ringo912

    ringo912 Active Member

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    Yeah...what SkyKing says. Not that we don't care, but ya sure make it tough for us to pay attention to what you have to say.:p :D
  15. chucktx

    chucktx Moderator Staff Member

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    hey sky and ringo........does my new one help ya read the posts better???:roflmao: :D
    if not i think i can put another one up!!!!;) ;)
  16. ringo912

    ringo912 Active Member

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    Not really....I like the other distraction better. It just took a little longer to read your posts. Here's how it went, read a word look at avitar, read another word look at avitar, read another word and go see if the wife is in the mood.:devil: If she wasn't then read another word look at avitar. :roflmao: :roflmao: :roflmao:
  17. chucktx

    chucktx Moderator Staff Member

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    :roflmao: :D :roflmao: ok, see if this one works....;) ;)
  18. ringo912

    ringo912 Active Member

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    Awesome...but I gues I'm on my own, the wife's at work.:(
  19. hotroadking

    hotroadking Super Moderator Staff Member

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    Sounds to me like the float may be off, when they changed jets they removed the float bowl and they have to get the pump rod back in the right place.

    175 isn't too big, but the main is usually rich on the stock carb anyway, there is not an emission test for WOT, so the 165 is usually ok for a filter and some pipes.

    It might be a bit rich for those long shots, had to rejet my carb when pulling off the thunderheader and putting on my longshots, bike couldn't pull through 70 MPH.

    Best bet is to bump the pilot jet one size, leave the main alone and drop in a sporty needle, adjust the air mix screw. That's all there is to it.

    If you smell fuel your gas line is leaking or the float may be sticking.

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