Carb hoses

[Monkhouse]

Hello,
I have a '78 GS1000, That I've recently started wrenching on. I was wondering what to do with the rubber hoses that come off of the carbs. My friend and I think that they might be for primer fuel, but I don't have the part to connect these to the petcock. Can some one out there set me straight on these?
http://farm5.static.flickr.com/4095/4756140544_e3158ebe83.jpg

 

[Suzuki_Don]

These are vent tubes to vent the float bowls. There should be two of them and they should exit between 1&2 and 3&4.

 

[Monkhouse]

I don't think these are the vent tubes. Don't they come out the bottom? I have four of those on the bottom of the carbs, but these are towards the middle, and there are three of these between 1&2, 2&3, and 3&4. They do suck in air when the motor is running, but it seems to idle better when they're plugged up. The middle one seems to draw in more air. thanks for the help though. Can anyone provide a picture of the gas tank hoses and petcock with them all connected? It seems there are lot's of little hoses hanging out under there.

Monkhouse

 

[kdo58]

http://members.dslextreme.com/users/storagecliff/images/hose_locations.html

 

[Monkhouse]

ok, thanks a bunch!

 

[KEITH KRAUSE]

ok, thanks a bunch!

The pics kdo58 showed you are NOT your carbs.
The '78 GS1000 comes with VM carbs, not CV carbs as shown earlier.
From left to right, sitting on the bike...
The hose connected to carb 2 is for float bowl venting.
The hose connected to carb 4 is for float bowl venting.
The hose connected to carb 3 is for vacuum (if used with non-vacuum petcock this needs to be capped).
The four smaller lines, one under each bowl, is for fuel overflow if the bowl level(s) get too high. Their hoses should be routed so fuel will drip on the ground instead of a hot motor.
The fuel line goes between carbs 2 and 3.
The two vent lines must be routed under the seat, no kinks, to allow adequate bowl venting.
IF you ever change to POD filters, REMOVE the two vent lines and leave the ports open to breath. This helps eliminate fuel starvation when running pods. This is required by Dynojet in their jetting info for your model. The vent lines do not allow proper venting at all times when used with pods.

 

[tas850g]

+ 1 for what Keith says. I have the VM carbs and Keith describes it very well.

 

[BassCliff]

Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. Monkhouse,

You'll probably find a factory service manual for your bike on my website, as well ad a VM carb manual. They may answer a lot of your questions too.

I just stopped by to welcome you to the forum in my own, special way.

If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", the Carb Rebuild Series, and the Stator Papers. Now let me roll out the welcome mat for you...

Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff