Announcement

Collapse
No announcement yet.

Hesitation Help !

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Hesitation Help !

    1980 750E

    Bike was a time capsule, all stock configuration. Was stored INSIDE a basement for 20 years. Carbs were rebuilt by suppose'd "shop" and then sat for 10+ years and never installed. Owner prior to me opened them back up and when I bought the bike we went through them carefully each jet ( the carbs were spotless clean to start with) and he sent me on my way.

    Bike runs but is hard to start, always requires a full choke regardless of conditions and hesitates in the low rpms. Get it out on the hiway and let it loose and pulls like a freight train from about 4,500 to redline. Changed the plugs yesterday and gave the plug caps a good lookover, probably should just change if I can find the ones I need. A friend suggested I may be running lean but he also said could be electrical too.

    I'd take any thoughts, you guys are the experts

    Thanks in advance

    #2
    Is the bikes maintenance all up to date?

    BTW, please check the Newbie Mistakes thread linked in my signature as a reference of things to look out for.
    Ed

    To measure is to know.

    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

    Comment


      #3
      Originally posted by Nessism View Post
      Is the bikes maintenance all up to date?

      BTW, please check the Newbie Mistakes thread linked in my signature as a reference of things to look out for.
      Yes, previous owner was meticulous about his record keeping. At some point about 10 years ago or so he apparently decided to get it "up to date", carbs were rebuilt, valves adjusted, chain, fluids, etc but then never followed through. Only thing that was not specifically mentioned, plugs and plug caps. I changed the plugs but old ones appeared nearly new, plug caps I ordered today.

      Comment


        #4
        Originally posted by old750 View Post
        ...always requires a full choke regardless
        That part is normal. Battery got a nice full charge?
        1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

        2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

        Comment


          #5
          Yep, what Rob said. Around here, if we ever had the carbs off, would go up a size or 2 on pilots to help the starting problem..
          1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

          Comment


            #6
            #1 rule on a new-to-me bike is that I don't trust anything the previous owner says regarding maintenance, even if there's paperwork or a log. If the work was done, how would I know it was done correctly? Whenever I get a bike, I go through all the maintenance items so that I know for sure the bike is up spec. That means a full fluid change, carb rebuild, airbox inspection, valve clearance check, clean all electrical connections, and so on. Even when the bike looks terrific, I always find something that was clearly overlooked.

            The symptoms that you're describing are carburetor problems, my bet is clogged idle jets. But you won't know for sure until you dig in.

            There's a link in my signature that leads to all the info and tutorials you could ever want about maintenance of these GSes.

            Oh, and welcome! We'd love to see pictures of what you have.
            Charles
            --
            1979 Suzuki GS850G

            Read BassCliff's GSR Greeting and Mega-Welcome!

            Comment


              #7
              Originally posted by old750 View Post
              Yes, previous owner was meticulous about his record keeping. At some point about 10 years ago or so he apparently decided to get it "up to date", carbs were rebuilt, valves adjusted, chain, fluids, etc but then never followed through.
              10 years ago? Hope you don't consider that up to date.
              Ed

              To measure is to know.

              Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

              Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

              Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

              KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

              Comment


                #8
                Hesitation can be from too lean at idle OR too rich. May be pilot size..or not. FIRST thing i would do is gently seat the mixture screws and set them 2 full turns out and test ride.
                MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                Comment


                  #9
                  Originally posted by Nessism View Post
                  10 years ago? Hope you don't consider that up to date.
                  Bike was never ran again, carbs were never even put back on bike. Something went awry with the original owner ( in his life) and he never touched it again after that. The person I bought from had for a short time and basically passed it through to me as he has dozens of bike projects & running bikes and he wanted to see it back on the road.

                  With my sellers blessing and assistance I contacted the original day one owner, fantastic guy with no reason to lie about anything as it was NOT him he sold it to me. I have seen the receipts, he kept everything. We have talked extensively about the bike, he can talk GS750E for days but at this point can't offer much. He thinks probably carbs.

                  Comment


                    #10
                    Originally posted by chuck hahn View Post
                    Hesitation can be from too lean at idle OR too rich. May be pilot size..or not. FIRST thing i would do is gently seat the mixture screws and set them 2 full turns out and test ride.
                    Yes, I guess this is probably the most logical place to dig in, 2 turns out is very good information, thanks!

                    Comment


                      #11
                      Originally posted by eil View Post
                      #1 rule on a new-to-me bike is that I don't trust anything the previous owner says regarding maintenance, even if there's paperwork or a log. If the work was done, how would I know it was done correctly? Whenever I get a bike, I go through all the maintenance items so that I know for sure the bike is up spec. That means a full fluid change, carb rebuild, airbox inspection, valve clearance check, clean all electrical connections, and so on. Even when the bike looks terrific, I always find something that was clearly overlooked.

                      The symptoms that you're describing are carburetor problems, my bet is clogged idle jets. But you won't know for sure until you dig in.

                      There's a link in my signature that leads to all the info and tutorials you could ever want about maintenance of these GSes.

                      Oh, and welcome! We'd love to see pictures of what you have.
                      When I bought the bike the carbs were off the bike in a box. Me (with the sellers assistance) literally stood there and pulled each jet and ran wire through them all, they are all clean. The carbs had been rebuilt years ago but never reinstalled, no gas had been through them. They were pristine. I am thinking though maybe some crud in tank could have made it down...maybe.

                      Comment


                        #12
                        Originally posted by Rob S. View Post
                        That part is normal. Battery got a nice full charge?
                        My 850 required a good choke but when it was hot it was choke on for about 5 seconds and off, this 750 needs it for at least a minute, maybe longer. I will check the battery again but it seems to be in good working order and charging system is putting out right at 14 volts which seems to be about typical

                        Comment


                          #13
                          If its taking a minute to catch i would be checking the timing advancer is free and snaps back when manually twisted. Then get it running and throw a timing light on it. Hard to start is also an indication of tight valves. I would also be doing an adjustment. In the services section we have a shim club. find out what shims you need and Ray will send them. Then send him your old ones. DO NOT turn the crank without a shim in the bucket.

                          Store this place for future use. i would google a service manual online if none of the ones hehas listed fits your bike,

                          MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                          1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                          NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                          I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                          Comment


                            #14
                            Originally posted by chuck hahn View Post
                            If its taking a minute to catch i would be checking the timing advancer is free and snaps back when manually twisted. Then get it running and throw a timing light on it. Hard to start is also an indication of tight valves. I would also be doing an adjustment. In the services section we have a shim club. find out what shims you need and Ray will send them. Then send him your old ones. DO NOT turn the crank without a shim in the bucket.

                            Store this place for future use. i would google a service manual online if none of the ones hehas listed fits your bike,



                            http://members.dslextreme.com/users/bikecliff/
                            Ding, Ding, Ding, we have a winner! Chuck, tried your previous 2 turns out on the mixture screws and now the bike starts up right away. Still running a bit rough, think a carb sync is in order. This bike had its valves adjusted by odometer about 300 miles ago, but in time many years ago. This bike also does not use the shim pads the way my 850 did, it has adjusters and I haven't looked into it yet but believe the valve cover needs to be removed to do it.

                            Did also look at advancer and it is in good condition and snaps right back

                            Thanks for the help!

                            Comment

                            Working...
                            X