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  • #21
    Their Main jet suggestions are a bit screwy as well.
    A CV Carb, and they have a huge step due to elevation.
    A stock carb has a 165 Main, and their stepping down to a 160, when a stock 165 is already lean with pipes and intake upgrades.
    Even a bone stock carb at WOT, will flow more fuel then the 160 with more elevation on the needle.

    On top of a 50 Pilot, they have the Tech backing the PMS(idle mixture screw) out 3 1/2. They also also refer to it as a Pilot air screw, when it adjust fuel. Interesting.

    Comment


    • #22
      Thank you thank you, I am learning alot, that is why this forum is so awesome.
      Life is tough, it's even tougher if your stupid----John Wayne

      Comment


      • #23
        There’s nothing wrong with the Speedstar kit, just remember it won’t use the same jetting recommendations as those normally recommended for a Barons kit.

        Just my $.02. I’d use a 37.5 Mikuni Pilot. A 172.5 Mikuni Main. 4 or 4 1/2 on the needle.

        I’m just tossing this out, based on davej’s experience with a 1700, and how the jetting changes go with the Barons kits for the 1600 and 1700 motors.

        Comment


        • #24
          I also say Barons kit. There is a known once and done jetting and no fooling around with it again.

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          • #25
            Thank you, the jet kits should be here by the time I return. Going to be out for a few days.
            Life is tough, it's even tougher if your stupid----John Wayne

            Comment


            • #26
              Mike,
              Checking my carb settings and the Yamaha 1600 service manual, the stock pilot jet should be a # 35 for the non California models. I'm not sure what the Calif. models use. I'm running the stock pilot jet #35, 65 main jet, and the needle set on the 3rd clip. The PMS screw is turned out 2 1/4 turns. My profile shows the pilot jet as #27 but it's the stock # 35.
              I did drill the slide, (2 vacuum holes) to 7/64" for quicker throttle response and reamed the bottom 4 holes out .001" on the emulsion tube. Running pumpless w/3mm float valve.
              I am running the Speedstar pistons and heads, aluminum intake, open air box, and Hard Krome 2 into 1 pipes. Spark plugs are indexed and gaps opened to .038". My elevation is 5200'.

              I'm a true believer for the 40mm CV carburetor, and the reason I say this, is my other 1600 RS is set up just alike, but has a HSR 42mm slide carburetor w/TPS on it. It does run well, about the same, but altitude really affects the out put and the best fuel mileage I've had was 38 mpg, where the CV carb wins hands down. I'm getting over 50 mpg if I keep it under 75 and not hot rodding around. With the slide modification on the vacuum holes, I could not feel any difference in acceleration between both carbs.
              I'm just letting you know what I have found out and what has worked with my bikes.
              Duke.

              Comment


              • #27
                Duke, The stock jetting for all 1600's is 35 pilot and 165 main jet not 65. The stock non adjustable needle clip position is at the same spot equal to the 4th groove in a barons and speedstar needle. If You are running a 165 main and 35 pilot jet you are running on stock jet size and if on the 3rd groove on the needle you are also running leaner than stock. I understand that the CV carb will tolerate/compensate for altitude change for the "most part" but at altitude you can also tolerate a little leaner jetting than the rest of us with less or no ill effect. You will also get a little better MPG up there. I also believe the CV carb is a great carb. I also drill the slides for better throttle response. The jetting configuration that most of us have gone to is going up in size on the pilot jet. It works great and it was not discovered by accident and old school guessing by butt dyno. I did a few actual dynos at the dealership to compare jetting changes along with exhaust changes to compare the AFR numbers in relationship to HP & TQ readings. Then I purchased a bike mounted AFR meter to tweak my readings for optimum performance with live real time AFR readings. I have jetted somewhere around 50-60 Roadstar carbs maybe even more, they all get a larger pilot and perform better than with the stock pilot jet. Here is a pic of the live real time AFR gauge. I'm not guessing as to what jetting works best.

                Comment


                • hotrod460
                  hotrod460 commented
                  Editing a comment
                  love to know where you got that AFR gauge ????

              • #28
                Dave, I'm not saying you are guessing with the jet sizing, and I'm not guessing either. The stock main jet size for our 1600 is a 160, manual says #60. With the mods on my bike and carb, I had to go up 2 sizes (165) to dial it in. No, I haven't had access to a dyno, but using a stop watch and highway markers works fairly well. You say old school, and I say poor boy. I do know how to read spark plugs and yes you could say old school but some of that works as well.
                I use to build dirt track V-8 race engines and used a dyno to help break in the engines, as well as dialing in the timing and carburetors. Haven't done 50 or 60, but have done at least 14 engines.
                I know several bikers that had only changed out the pipes and didn't have to change the jetting, but when changing the air box to a more free breathing box, jet changes were needed.
                I'm not saying you are wrong, I'm just thinking your telling me that I am.

                I'm' just letting Mike know what works on my bike. I give him the numbers, my elevation, and this info for reference for him to work with, not telling him what to do.

                Thank you for your response. Duke.

                Comment


                • Duke
                  Duke commented
                  Editing a comment
                  SORRY Dave, my manual does say main jet is 165. The first time I went into my carb, it was a 160 according to my records. Have you ever herd of dealers changing jets on new bikes? Duke

              • #29
                Actually, the stock 1600 Main for the CV Carb, is a Mikuni 165. Always has been.

                Comment


                • Duke
                  Duke commented
                  Editing a comment
                  I bought it new in Rock Springs, Wyoming, 2001. The carb had a 160 main jet in it from the factory. Manual says # 60.
                  Purchase 2 carbs for that bike off eBay both having 160 main jets.

              • #30
                Been on this forum for 6 plus years and 100’s of people looking for jetting info. The Old forum had been up and running for close to 15 years, with pages of jetting info. Your comment about your stock main being a 160, is a first.

                Just saying.

                Comment


                • Duke
                  Duke commented
                  Editing a comment
                  I don't know why my bike and the carbs I purchased would have the 160 in them if they shouldn't be? I know for a fact that my bike came with a 160 main jet. The dealer took it out of the shipping crate that way. I had to wait a day to pick it up for assembly and service. Just checked Yamaha parts and they do show a 165 jet. I'm baffled!!!!
                  Last edited by Duke; 05-16-2018, 01:18 PM. Reason: Just checking Yamaha parts and found that interesting news

              • #31
                Hi guys , just to add to this conversation,,,,,,,, first of all im in UK and have a standard needle with 5 grooves,,,,,,,,,,im running primary 37.5,,,,main 180 and clip on 4th groove with spacer and one washer, PMS at 1.5 turns,,(aftermarket thumb screw type, has smaller tip),,,im at 167ft with open pipes and S&S teardrop filter.

                This works for me, ive been working on it for a while, and any smaller main runs a little flat at WOT, rest of the throttle band works fine, no problems to date. plugs read ok and pulls hard all the way

                Im not saying this is right or wrong but it works for my bike and my riding style
                Sometimes it takes a whole tank of gas before i can think straight

                Comment


                • SKWEARpeg
                  SKWEARpeg commented
                  Editing a comment
                  If the 180 is a Mikuni, then that bears out my thinking on the Speedstar needle allowing for a fatter Main.
                  The Wildstars came from the factory, with a multigroove needle, and I’d imagine the profile would be more like a Speedstar, then the slimmer faster tapered Barons or DJ.

                • hotrod460
                  hotrod460 commented
                  Editing a comment
                  Yea i guess that too, after reading all about the jetting with baron and dynajet, it was just not working for me,,, then the penny dropped,,,ive got a uk standard needle, so, start from the pms/primary and work up, and it seemed to work.,,,,,yes all mikuni jets

              • #32
                O.K. Got home today and pulled the carb. I ended up using the 170 main from the barons kit, the needle with the clip on the 4th groove away from the blunt end with the spacer and one washer under and the other washer over for the spring to ride on. PMS at 2.5 turns out. I ordered the 37.5 primary from barons with the jet kit but got the wrong one so didn't change that. It seamed to run pretty good, had to use the choke to start it on a pretty warm day, warmed up normal sounded good, will know more after a real ride. So, any thoughts or input, the speed star kit should show up in the mail any day.
                Life is tough, it's even tougher if your stupid----John Wayne

                Comment


                • SKWEARpeg
                  SKWEARpeg commented
                  Editing a comment
                  The bike doesn’t give a shite what the outside temps are, when it has been sitting.
                  You use the ENRICHER to enrich the air fuel ratio at the start.
                  The only difference temperature makes, is how long you have to need some enrichment until the bike operates good without any.

              • #33
                So you just ignored the 1700 recommended settings given to you by Davej? What is it that John says?

                Comment


                • MikeyC
                  MikeyC commented
                  Editing a comment
                  I have a 1600, but, I didn't follow exactly as someone had posted because I didn't have the correct primary? 37.5 jet? So improvised. There was 3 of us standing around and the consensus was what I ended up with, see below.

                • roadiemort
                  roadiemort commented
                  Editing a comment
                  My mistake thought you were 1700, oops.

                • MikeyC
                  MikeyC commented
                  Editing a comment
                  No problem, wouldn't have been my first f*** up. See what John says.

              • #34
                So, on the ride to work this morning bike seamed to run like a raped ape. Sounded good and ran good in town, thru the twisties and on the freeway, I don't think this bike has ever run this good. Will have to do the tail pipe swab tonight or tomorrow to get an idea.
                Life is tough, it's even tougher if your stupid----John Wayne

                Comment


                • #35
                  Originally posted by MikeyC View Post
                  So, on the ride to work this morning bike seamed to run like a raped ape. Sounded good and ran good in town, thru the twisties and on the freeway, I don't think this bike has ever run this good. Will have to do the tail pipe swab tonight or tomorrow to get an idea.
                  Put the 37.5 pilot in it when you get it and it will run even better. If you have a speedstar kit on the way ,send it back and stay with the Barons kit and needle you have now. Just change the pilot jet to a Mikuni 37.5.

                  Comment


                  • MikeyC
                    MikeyC commented
                    Editing a comment
                    Is that why I got the wrong one? I have to specify Mikuni 37.5?

                  • SKWEARpeg
                    SKWEARpeg commented
                    Editing a comment
                    Yes. The DJ 37.5 Pilot is the same size as the 35 Mikuni you have in the carb stock.

                    Mikuni 37.5

                • #36
                  There were no pilot jets in that kit I wonder if they left it out on accident?

                  2000 Roadstar 1600 - BAK, Pumpless, Curt's manifold, Mikuni HSR42 Freedom Combat Pipes Jumbo Strong bags, PPG 'HellFire' Paint.

                  Comment


                  • #37
                    You have to order pilot jet separately
                    You have to be odd if you are number one

                    Comment


                    • MikeyC
                      MikeyC commented
                      Editing a comment
                      Ya, I ordered it separately but I got this big jet with a thumb screw knob on one end. I just said I needed it for a 1999 Yamaha Road Star. I will say Mikuni Carb next time. One of those lessons learned

                    • SKWEARpeg
                      SKWEARpeg commented
                      Editing a comment
                      It’ll look just like the stock Pilot. The difference will be in what’s stamped on the side. Just make sure it’s a Mikuni.

                    • MikeyC
                      MikeyC commented
                      Editing a comment
                      Think I got the right one coming this time. It had a picture with it and everything. No thumb screw.

                  • #38
                    An update.
                    So I finally got my 37.5 Mikuni pilot jet. I had put the 170 main in and it was a tad rich buy the tail pipe swab test. ( I hate getting my tail pipe swabbed) So as I had to open it up anyway I did what was recommended and put the 167.5 main in with the 37.5 pilot and it seams to run good, have to put some miles on her now, We will get close to 1000 miles this week end. Oh, ended up with the Barons kit. With the recommendations on that I don't expect any problems.
                    Thank you all for your input and help.
                    Life is tough, it's even tougher if your stupid----John Wayne

                    Comment


                    • #39
                      The 170 Mikuni Main, is a good choice if you’re using a 1700 ignitor or a Dyna 3000 with the rev limit set to 5000. The little extra fuel over the 167.5, helps when you want to go-go.

                      A Roadies tailpipe is always gonna be black. Especially if the AIS is gone. The only time it may lighten a bit, is if you are on an extended road trip, and look at it at a fuel stop.
                      If the carbon build up in the exhaust gets to a fuzzy ‘you can drag your finger lightly and leave a path’ type build up, you may have an issue.
                      You’ll always get black on the ridges of your finger prints just lightly pulling your finger on the inside.
                      They run a bit rich at idle, which the AIS took partial care of, and they run rich on the start up.

                      Comment

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