vacume on carbs

[Guest]

hello again. im wondering if the vacume on my carbs was so far out ,my question is would the bike run bad? gs750 1979 if it sounds like a stupid question, please understand im NO mech. ive done everything else so the next step will be setting this in the morning. ill get back and let you all know.

[azr]

Yes, it will run bad if it would start at all.

[tom203]

Do you have VM carbs (3 screws holding tops on)? If you hold one hand across one carb intake and press starter button, you should feel a slight "vacuum" on your hand as engine cranks. If it starts, it's got vacuum; getting it to run right involves lots of issues.
You say "ive done everything else ... " like what?

[captrise]

vac gs750e 1979

the other things ive done ,complete carbs rebuild ,dyna s ignition complete kit, timing set, plugs, fuel lines, filter ,peacock new battery. when I rebuilt the cabs I set them to factory specs ,with the needle I set it at #2 with the little clip. it was on the third space before but the guy I picked the bike up from had them so messed up that I decided to go with factory setting. starts right up and idles great, then I go down the road with alittle throttle and the bike seems to be starving ,like bogging down. maybe its not getting enough fuel.the fuel metering screw is at 2 turns out ,the air is at 1 1/2. the bike did have k/n pods but I put the air box back on . the bike ran fine in the past then started missing,popping etc. I change plugs ,which were black and it seemed to help ...for 5 miles then it started again. my thought was the coils were getting hot and failing .that's why I went with the dyna s figuring this was it. well, the next step is setting the vacume , . ive bench sync them already. that's about it . I,ll try tomorrow the main 102, the pilot air #15 with the coils I figured the spark wasn,t hot enough and it caused the plugs to get black, sooty thanks for getting back to me . I truly am thankful,Captrise

[captrise]

vac gs750e 1979

the other things ive done ,complete carbs rebuild ,dyna s ignition complete kit, timing set, plugs, fuel lines, filter ,peacock new battery. when I rebuilt the cabs I set them to factory specs ,with the needle I set it at #2 with the little clip. it was on the third space before but the guy I picked the bike up from had them so messed up that I decided to go with factory setting. starts right up and idles great, then I go down the road with alittle throttle and the bike seems to be starving ,like bogging down. maybe its not getting enough fuel.the fuel metering screw is at 2 turns out ,the air is at 1 1/2. the bike did have k/n pods but I put the air box back on . the bike ran fine in the past then started missing,popping etc. I change plugs ,which were black and it seemed to help ...for 5 miles then it started again. my thought was the coils were getting hot and failing .that's why I went with the dyna s figuring this was it. well, the next step is setting the vacume , . ive bench sync them already. that's about it . I,ll try tomorrow the main 102, the pilot air #15 with the coils I figured the spark wasn,t hot enough and it caused the plugs to get black, sooty thanks for getting back to me . I truly am thankful,Captrise

[tom203]

You've been busy for a "NO mech" guy. Let's bump you up and get someone more familiar with these VM's than me. Was running Ok ,but now running rich real quickly as you open throttle.

[Steve]

OK, I am just going to comment or ask questions in a copy of your post.

the other things ive done ,complete carbs rebuild ,
what kind of "rebuild"? Did you buy 'rebuild kits' or did you get the o-ring kit from cycleorings.com?

dyna s ignition complete kit, timing set, plugs, fuel lines, filter ,peacock
Now there is a first.

new battery. when I rebuilt the cabs I set them to factory specs ,with the needle I set it at #2 with the little clip.
Is the rest of the bike stock? Pod filters? Header? #2 might not be the best place for the clip.

it was on the third space before but the guy I picked the bike up from had them so messed up that I decided to go with factory setting. starts right up and idles great, then I go down the road with alittle throttle and the bike seems to be starving ,like bogging down. maybe its not getting enough fuel.the fuel metering screw is at 2 turns out ,the air is at 1 1/2.
Depending on how "stock" the rest of the bike is, the fuel screws should be out 3/4 to 7/8 turn, and the air screws double that.

the bike did have k/n pods but I put the air box back on . the bike ran fine in the past then started missing,popping etc.
OK, this answers one of my questions.

I change plugs ,which were black and it seemed to help ...for 5 miles then it started again.
Black plugs show you are running rich. With your fuel screws out 2 turns, that is not a surprise at all.

my thought was the coils were getting hot and failing .that's why I went with the dyna s figuring this was it. well, the next step is setting the vacume , . ive bench sync them already. that's about it . I,ll try tomorrow the main 102, the pilot air #15 with the coils I figured the spark wasn,t hot enough and it caused the plugs to get black, sooty thanks for getting back to me .
The spark will not be any "hotter" in a clean-burning engine, they are getting sooty because you are running REALLY rich.
You should also be sure to have the stock plugs in there, B8ES.

I truly am thankful,Captrise

.

[captrise]

carbs

yes Steve, got your answers I see where your going. I,ll try and see what happens. Thats some family . nice set of rides. really great collection. I have 76 kz900 86 1100 virago both are really great shape.sooner or later this gs will get done ,then on to the next bike being on disability, I have a lot of time. Captrise