Idles bad

[Anonymous]

I have a 1977 gs750 and i cant get it to idle below 2000 rpms without it dieing out. i mess with the idle screw and it either idles at 3000 rpms or goes down to 1800 at which point it start to die and stall. Any tips, oh yeah i have pod filters and straight pipes and not sure if the guy who put them on before i bought the bike rejetted it. (could that be the problem?)

[SqDancerLynn1]

In a word YES You need to check the jets to see what is in it

[Anonymous]

still idles bad, need help

ok i checked the jets and they were 100 and 25 so i changed them to main jet: 115 and pilot jet 17.5. it still wants to stay at 3000 rpms and wont stay under that. any tips?

[SqDancerLynn1]

Ok You may have a vacuum leak Check the intake rubber boots / O rings, spray them with liquid I use windex/409 cleaner. DO you have the petcock vacuum connection hooked up (#3 carb) & Make sure the choke linkage is turning off completely

[Anonymous]

i checked all those and i think it may be that one carb is running extra lean. do you think that could be it? Oh and the top speed on my bike (1977 GS750) is only like 100mph is this normal?

[SqDancerLynn1]

I think you have more than one problem, CHeck this chart for jetting Info

http://www.thegsresources.com/_forum/viewtopic.php?t=17814

add up your changes

[Detman101]

Is your bike idling correct now? If so how did you fix it. Mine idles at 5000 rpm without choke and with the idle screw all the way out.
I don't know how to fix this and perhaps you can help me understand what the hell is going on with my bike.


Dm of mD

[SqDancerLynn1]

Re: sync the carbs if still not having any luck You may have to remove the carbs and do a mechanical sync first If they are WAY out of adjustment

[Detman101]

I think that I have my pilot screws (ones with the caps over em) too far out. Dynojet said to turn them 5 turns out. I guess that would affect the idle speed if the mixture is too rich. I'm going to recheck my float level and needle-seat o-ring and report back.


Dm of mD

[robinjo]

I think that I have my pilot screws (ones with the caps over em) too far out. Dynojet said to turn them 5 turns out. I guess that would affect the idle speed if the mixture is too rich. I'm going to recheck my float level and needle-seat o-ring and report back.


Dm of mD

Do you have enough slack on your throttle cable?

[Detman101]

Yes. I believe I do but I will recheck them again. I could have adjusted them too tight when I ptu the throttle cable back on the bike.
Actually...you know what? I think that may be the problem!
I had to change the settings on it to get the carbs back on the bike and the cable back in the little holder thingy. If this is the problem I'm going to smack myself with some rebar.
I adjusted the idle screw all the way out. If the throttle cable is holding the throttle assembly too tight of course its not going to touch the idle adjustment screw!!! Eureka! THANK YOU!!!!!
Time to bust out the flashLight and check this...


Dm of mD