Help! Carburetor/fuel mixture problem (I think) 1979 GS1000

[Guest]

[zed1015]

The carbs on the bike are cable actuated, so I don?t believe they are the CV carbs. The service manual tells me they are VM26SS.

Correct. Your 79 GS1000 has VM slide carbs..
Not CV's.
CV's came in 1980 but not on all models.

[Guest]

Correct. Your 79 GS1000 has VM slide carbs..
Not CV's.

Thanks for confirming.

[Guest]

So, I'm in better spirits today, but still quite lost with what next steps I should take. I've been reading through some forums and it seems like the starting system on the carbs may have something to do with this. I'm not too sure what exactly would need to be done however. The plunger and everything that I can see looks to be in good shape.

[allojohn]

Send your carbs to Ed then adjust your valves. Get those two steps done and you're nearly there.

[Big T]

When you say you cleaned "all parts" does that include the carb bodies? And, how did you clean them?
did you follow the valve adjust and VM carb cleaning tutorials?

[Nessism]

Are those CV (Constant Velocity) carbs, in other words, do they have a diaphragm? If so, you will have to make an air box to build up vacuum to get the diaphragms to function, otherwise,it will never work. I just went through this with someone on a Kawasaki forum, same thing CV carbs will not run with air pods.

Use google and search "dynojet jet kit". One of these kits, with quality pods like K&N's, and CV carb bikes run perfectly.

Regarding the OP's bike, did I read correctly that you are running an open header? No muffler at all?

[Nessism]

Correct. Your 79 GS1000 has VM slide carbs..
Not CV's.
CV's came in 1980 but not on all models.

Suzuki GS bikes make a clean switch in 1980 to CV carbs and electronic ignition. The 400/425/450 were always CV.

[Guest]

Use google and search "dynojet jet kit". One of these kits, with quality pods like K&N's, and CV carb bikes run perfectly.

Regarding the OP's bike, did I read correctly that you are running an open header? No muffler at all?

I've seen those dynojet jet kits before. Do you think it's worth the money?

As far as the exhaust system, I have the 4-1 pipes from delkevic but without the muffler.

[Guest]

When you say you cleaned "all parts" does that include the carb bodies? And, how did you clean them?
did you follow the valve adjust and VM carb cleaning tutorials?

No, I have not cleaned the carb bodies. I'll need to do some research on how to do so. Tomorrow I'm planning on dong one more deep clean of the carbs aside from the original cleaning, gasket replacement, and o-ring replacement.

[Big T]

Go back up to Nessism's post and click on the Top Newbie mistakes. Go to 1b. That's all the research you need. Also, when you're at the Basscliff site, download a factory service manual.

[Guest]

Go back up to Nessism's post and click on the Top Newbie mistakes. Go to 1b. That's all the research you need. Also, when you're at the Basscliff site, download a factory service manual.

Thanks for the info on the carb cleaning page, but that is for the CV carbs. My bike has the VM carbs. If there is a similar resource for the VMs, that would be awesome.

[zed1015]

Suzuki GS bikes make a clean switch in 1980 to CV carbs and electronic ignition. The 400/425/450 were always CV.

I was refering solely to the GS1000's to which this thread applies not the whole suzuki range and depending on country the GS1000GL custom retained the VM carbs for 1980..

[Suzukian]

It's good to know that Suzuki CV carbs can build up enough vacuum without an air box to provide it, and "Pods' will work. They won't work on Kawasaki bikes, or on my Kawasaki ZZR1200, and tons have been written on that. No vacuum, I wonder where the Diaphragm gets is suction. The Mikuni VM link I gave was pretty comprehensive. Hope you checked it out.

[Nessism]

I was refering solely to the GS1000's to which this thread applies not the whole suzuki range and depending on country the GS1000GL custom retained the VM carbs for 1980..

In the US market, all GS bikes were on CV's by the 1980 model year. I'm not sure about the UK, or other parts of the world, though.