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  • #21
    Hi I'm new to the clinic. I have a 2007 roadstar. My question is I have HK 3 in Long shot pipes k&n high-flow air filter stock carburetor what is the best main and pilot Jets to use. I live in northeastern Ohio if that helps

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    • #22
      from California.

      Using Mikuni jets; if you have baffles in your HKs, 172.5 main, without baffles, 175 main. 37.5 pilot. Also, if you still have a stock needle with only one groove, get a Baron's needle, it comes in their complete jet kit, along with all the jets you need. Put the C clip on the 4th grove from the blunt end of the needle and turn the Primary Mixture Screw 2.5 turns out from lightly seated. A Baron's PMS makes life a little easier when doing the fine tuning.

      If you're K&N filter is in a housing that resembles anything like the photo below, swap out your air bleed jet on top of the carb, under the big plastic cover, and replace it with a stock size Mikuni B30/97 1.0 air jet. You can get the air jet on eBay.

      Click image for larger version  Name:	$_3.JPG?set_id=2.jpg Views:	1 Size:	20.4 KB ID:	67942
      Last edited by Doc_V; 04-18-2019, 08:28 PM.

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      • davej
        davej commented
        Editing a comment
        the stock size is 2.0
        2. Pilot Jet, Air (2.0)
        239-14172-20-00

    • #23
      This is my filter

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      • #24
        Thanks doc for ur replies, I'm new here

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        • #25
          No problem I just didn't want to re-write that entire post on your other thread. Glad to be of help.

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          • #26
            Hey guys I'm trying to jet my '02 with a big air kit and pipes with open baffles. The previous owner installed a jet kit that looks like a barons but I'm having some issues tuning it and I think someone may have gotten too aggressive in cleaning it in the past so I'd like to replace the main and pilot to be sure. I saw someone posted the part number for the mikuni pilot jet is N224.103.37, does anyone know what the part number is for the 172.5 main? Should I go with a little bigger 174 or 175? Jetsrus has a stick up their behinds about returns/exchanges so I'd like to be sure before I order. Thanks

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            • davej
              davej commented
              Editing a comment
              on a 02 don't go any larger than a 170 main jet. In fact only use a 170 if you don't have any baffles in the mufflers at all. You will get better performance with baffles installed and then use a 167.5 main jet and the 37.5 pilot. using a Barons kit. If you are guessing that it is a Barons kit and are wrong you are on your own trying to figure out what jetting will be best due to the difference in length, diameter and taper of the different brand aftermarket needles.

          • #27
            Originally posted by Scottyxbones View Post
            Hey guys I'm trying to jet my '02 with a big air kit and pipes with open baffles. The previous owner installed a jet kit that looks like a barons but I'm having some issues tuning it and I think someone may have gotten too aggressive in cleaning it in the past so I'd like to replace the main and pilot to be sure. I saw someone posted the part number for the mikuni pilot jet is N224.103.37, does anyone know what the part number is for the 172.5 main? Should I go with a little bigger 174 or 175? Jetsrus has a stick up their behinds about returns/exchanges so I'd like to be sure before I order. Thanks
            For a 1600 you want 167.5 main and 37.5 pilot...Muse adjustable baroness needle with clip on 4th groove (Needle 4th groove from short end with washers and spacer in stock position 1 silver washer and plastic spacer under the clip)

            and turn PMS to 2m5 turns out....should be about right on there with warm idle set at 950
            "I'm Ricky Bobby. If you don't chew Big Red.....then Fuck You"

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            • #28
              Whoops thats right, 167.5 main, does anyone know the mikuni part number to order on jetsrus? I'm gonna keep it free flowing and loud, I don't mind a few horsepower lost, also I'm cheap and not gonna spend the money on baffles. Should I go with a 168 main?

              Where can I order a barons silver washer and plastic spacer?

              What model of carb do we have on an '02? I've seen both mikuni 38 and 40, nowhere do I see the model name like hsr, bn, bds, etc. Thank you guys again

              Comment


              • roadiemort
                roadiemort commented
                Editing a comment
                The carb for both 1600 & 1700 bikes is a Mikuni BSR40. There were a couple of insignificant changes thruout the years but all the inner parts are interchangeable for jetting or rebuilding purposes. As per DaveJ

              • davej
                davej commented
                Editing a comment
                no such thing as a 168 mikuni main jet for our carb. IMO if you are gonna stay with no baffles you are very safe in using a 170 main with a 37.5 pilot jet. the plastic spacer and washer should be on the needle that you are using right now.

            • #29
              I pulled my carb apart tonight, it was jetted for a 1700 with a 172.5 main and 40 pilot, the diaphragm was all distorted and out of shape too. No wonder I was having issues. I measured my main and it looks like I have N100.604 Genuine mikuni large round style in there, so I'll replace it with the correct size

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