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

[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.

 

[Nessism]

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.

I don't know about the ZZR1200, but MANY bikes with CV carbs can be tuned to run with pods. It's just that some are more difficult than others. Obviously, it's the bikes with sidedraft carbs that are applicable for pods, not the modern race bike stuff with downdraft carbs.

And again, purchasing a Dynojet kit shortcuts most of the trial and error involved in the process. One thing that helps greatly is a more tapered needle.

https://www.dynojet.com/jet-kits/

 

[Suzukian]

I will defer on your knowledge, as it is quite extensive. On the Kawasaki forum I belong to, I helped a guy out by just mounting the pods on long tubes. The extra 5 inches or so created enough of a drop in pressure that allowed his diaphragms to move their full range. Personally, if I had the money, I would put flat slides on all of my motorcycles, but I don't have that kind of money. My ZZR was a "Barn" find. Kept in a temperature controlled room, it has only 4875 miles on it. The guy was 6'4" tall, and purchased it as his first bike. It terrified him, and he parked it. A friend convinced him to sell it, and I got it for $2200 dollars. I don't think he knew what he had. The shop had just rebuilt the carbs and tuned it up.

The ZZR1200 is so insanely fast, the need to modify it seems ludicrous. I did remove the 50 lb. catalytic converters, and with what I put on, removed 40 lbs. of weight off of the bike, I think it looks better too. Those are Radiant Exhaust tips on the end, and the inside has a long baffle with Ceramic Cloth wrapped around it. I think it looks better than the stock can, but the weight savings was why I changed it. The stock pipes are available for cheap on EBAY.



Stock:

 

[Suzukian]

Stock ZZR1200 with stock exhaust:

 

[Big T]

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.

Go to the Gssrchive.bwrimger.com page and you'll find the VM tutorial on the right side of the page

 

[Rich82GS750TZ]

The link Big T meant to post is here: https://gsarchive.bwringer.com/

Or, it's the fist link in my signature. Lots of goodies on bikeCliff's Website for anyone with a 70's-80's Suzuki GS. You want the VM Carburetor Rebuild Guide. Below the Manuals section along the right hand side, 3rd link down. Or, here's a direct link:

https://gsarchive.bwringer.com/bikecliff/images/vm_carb_rebuild.pdf

 

[Guest]

The link Big T meant to post is here: https://gsarchive.bwringer.com/

Or, it's the fist link in my signature. Lots of goodies on bikeCliff's Website for anyone with a 70's-80's Suzuki GS. You want the VM Carburetor Rebuild Guide. Below the Manuals section along the right hand side, 3rd link down. Or, here's a direct link:

https://gsarchive.bwringer.com/bikecliff/images/vm_carb_rebuild.pdf

Awesome, I appreciate your time and help. Looks like it’s time to get back to work!