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Won't start cold. Jetting too aggresive?

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    #1

    Won't start cold. Jetting too aggresive?

    I've got an '83 gs650. It has pod filters and shorty mufflers on it with the Dynojet stage 3 kit. Rode great all summer. I let it sit for over a month. It ran a few days ago. I did a few laps around the neighborhood and it went just fine. However, after a while it just would not make hardly any power with the throttle above idle. Now I tried to start it today and I could only get it to idle for a minute on full choke. It is 55 degrees F today in Iowa (Hardly even cold yet). I could try it again with some starting fluid, lighter weight oil, and maybe a space heater.

    Thoughts? Is the jetting just to aggressive for the colder weather? Anyone else with these mods run into this problem?
    Tags: cold start, wont start cold
    #2
    Check your battery.
    1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
    1985 GS1150ES stock with 85 Red E bodywork.

    Comment

      #3
      >Check your battery

      Battery was fine. I will probably have to put it on the charger since I wore it down a bit by cranking on the starter so much.

      Comment

        #4
        Well, if you didn't make any changes, then it's probably bad gas or something got into the fuel and clogged something up. I've seen posts where rust breaks loose from inside the tank and clogs up the needle jets.

        I'd start by draining out all the gas, including what's in the bowls and put fresh gas in. It could be your needles or floats are gummed up and is letting just enough gas in over time to fill the bowls and get it started but not flowing enough to keep up with demand. I would also check all the spark plugs by pulling them and making sure each has a nice fat spark. Also, take a look at the color of the plugs and let us know what they look like.

        If all that checks out and the problem still persists, it's time to pull the carbs and go through them.

        Jetting isn't going to change on it's own and 55 degree's is not could enough to create a major jetting change requirement in my experience.
        1982 GS550M Rebuilt Winter '12 - 550 to 673cc engine conversion.
        1989 Kawasaki ZX-7 Ninja
        2016 Ducati Scrambler Full Throttle

        Comment

          #5
          Make sure you have gas in the tank... sounds stupid, but I've been known to overlook something that simple

          Also, check the fuel line isn't kinked. Is there a fuel filter on the line?
          '85 GS550L - SOLD
          '85 GS550E - SOLD
          '82 GS650GL - SOLD
          '81 GS750L - SOLD
          '82 GS850GL - trusty steed
          '80 GS1100L - son's project bike
          '82 GS1100G - SOLD
          '81 GS1100E - Big Red (daily rider)

          Comment

            #6
            Actually, "aggressive" jetting will work BETTER in cold weather.

            When is the last time you checked your valve clearances?

            .
            sigpic
            mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
            hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
            #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
            #2 son: 1980 GS1000G
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            Comment

              #7
              Tight valves can cause difficult cold starting.
              sigpic Too old, too many bikes, too many cars, too many things

              Comment

                #8
                Tight valves are not going to cause the bike not to accept throttle...And it's hard starting cold, not hot when the clearances are tighter.
                1982 GS550M Rebuilt Winter '12 - 550 to 673cc engine conversion.
                1989 Kawasaki ZX-7 Ninja
                2016 Ducati Scrambler Full Throttle

                Comment

                  #9
                  OK don't check the valves then. That'll work fine.
                  http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                  Life is too short to ride an L.

                  Comment

                    #10
                    Originally posted by Sci85 View Post
                    Tight valves are not going to cause the bike not to accept throttle...And it's hard starting cold, not hot when the clearances are tighter.
                    Not true........
                    1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
                    1985 GS1150ES stock with 85 Red E bodywork.

                    Comment

                      #11
                      I'm not saying don't check them. Its always on the list of must do items. I am saying that based on his description of the problem, tight valves are most likely not the issue. The OP stated the bike ran just fine a few days ago then started having problems. Valves don't get tight and cause a bike to not take,throttle overnight.
                      Last edited by Sci85; 10-30-2013, 01:29 AM.
                      1982 GS550M Rebuilt Winter '12 - 550 to 673cc engine conversion.
                      1989 Kawasaki ZX-7 Ninja
                      2016 Ducati Scrambler Full Throttle

                      Comment

                        #12
                        Originally posted by Sci85 View Post
                        Valves don't get tight and cause a bike to not take,throttle overnight.
                        Maybe or maybe not, but tight valves turn into burnt valves, they can cause all kinds of problems.
                        Can't hurt to check, might be the problem.
                        Might not.
                        It's probably a carburetion issue going by the modified intake and no mention of doing any testing of jetting, but tight valves could certainly be contributing to the problem.
                        Could be anything from ignition to gas tank venting to a clogged exhaust, he didn't give us much information to go on.
                        Last edited by tkent02; 10-30-2013, 05:25 AM.
                        http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                        Life is too short to ride an L.

                        Comment

                          #13
                          Maybe or maybe not, but tight valves turn into burnt valves, they can cause all kinds of problems.
                          True. Didn't think about that one.

                          Hopefully he's done some troubleshooting and will reply back with the outcome.
                          1982 GS550M Rebuilt Winter '12 - 550 to 673cc engine conversion.
                          1989 Kawasaki ZX-7 Ninja
                          2016 Ducati Scrambler Full Throttle

                          Comment

                            #14
                            Either no gas or bad gas (sat idle for month). mine started fine at 42 degrees yesterday and behaved/ran normally unlike me who was freezing!
                            1981 gs650L

                            "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                            Comment

                              #15
                              The bike ran great all summer with the dynojet and pipes/pods.

                              I took the tank off in order to mess with some electrical stuff and it sat for about 4-5 weeks. Is that long enough for the gas to turn bad?

                              Comment

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