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Bike doesnt return to low rpm and camchaintensioner is moving

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    Bike doesnt return to low rpm and camchaintensioner is moving

    So i got a beautiful gs 400 from 1977 as a gift that had been sitting for over 15 years. I got it running again, cleaned the carbs and some other minor fixes. It idles fine but when i'm riding and close the throttle the rpms dont return to normal. The only way to lower the rpm is to stop and slowly open up the clutch. I suspect a vacuum leak somewhere. Am i right? i hope not because the rubber parts are a **** to come by in the Netherlands especially the ones that go from airbox to carb.

    The Camchain tensioner also moves, i already took it off the bike to reset it and wound up the big spring an extra turn, but it still moves.

    This is my first dive in the world of motorcycle repair so I am kind of clueless on what to do next so I hope you guys can lend me some of your knowledge.

    #2
    Unless your throttle cable or throttle linkage on the carbs are sticking, your rev hang is likely due to air leaks in front of and/or behind the carbs. Sorry.

    The cam chain tensioner is supposed to move. At least bounce a tiny bit while the bike is running. That’s its job. Not sure winding the knob an extra turn is best practice. Maybe take a look at the tensioner rebuild tutorials on BikeCliffs website, linked in my signature.

    Welcome to the site, and to the wonderful, fun world of vintage motorcycles.
    Rich
    1982 GS 750TZ
    2015 Triumph Tiger 1200

    BikeCliff's / Charging System Sorted / Posting Pics
    Destroy-Rebuild 750T/ Destroy-Rebuild part deux

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      #3
      You don’t sound that clueless....camchain tensioner fools a lot of folks during reinstall...make sure you do it right
      1981 gs650L

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

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        #4
        For intake air leak, maybe you need just the o-rings (that are up against the head).

        When get o-rings also get another set of bolts-screws for the boots because likely to destroy some of them Getting them out.

        Maybe check with “cycle o-rings” (a fine member here) to see if he does international shipping.

        Had 850G for 14 years. Now have GK since 2005.
        GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


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          #5
          Thanks for all the helpfull replies. I am going to order some new parts and hopefully that solves it because i really want to ride this beautiful bike.

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            #6
            Originally posted by Teun View Post
            Am i right? i hope not because the rubber parts are a **** to come by in the Netherlands especially the ones that go from airbox to carb.
            Aren't these guys still around?

            CMSNL specializes in Honda Motorcycle Parts, Kawasaki Motorcycle Parts, Yamaha and Suzuki OEM and Aftermarket Motorcycle Parts for Classic Bikes, Dirt Bikes, ATV's, Snowmobiles and more
            '83 GS650G
            '83 GS550es (didn't like the colours in the 80's, but they've grown on me)

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              #7
              Yes, many of my friends in japan use that site to buy oem Suzuki parts.
              1979 GS425

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                #8
                Or maybe these guys. https://www.motorcyclespareparts.eu/en
                The big guy up there rides a Suzuki (this I know)
                1981 gs850gx

                1999 RF900
                past bikes. RF900
                TL1000s
                Hayabusa
                gsx 750f x2
                197cc Francis Barnett
                various British nails

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                  #9
                  I had something like this on a BMW R100,it turned out to be the timing back plate had moved during rebuild and the timing was way too advanced

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