What is this carb part?

[Guest]

82 GS650L I noticed these two "hose connections"? one is between carb 1&2, the other between carb 3&4. The carbs are all cleaned up, and ready to go back on the bike. I'm guessing overflow tubes? Thankscarb7.jpg

[Nessism]

Yes, overflow ports. You should attach some tubes to those and then route them up on top of your airbox or similar.

BTW, I hope your photo is the "before cleaning" shot. Those carbs are not clean.

Edit: see note below. Not overflow ports, vent ports.

[chuck hahn]

Actually they are bowl vents.

[Nessism]

Actually they are bowl vents.

Correct chuck. My bad.

[abaton6]

Routed on top of the airbox, or similar?

[Nessism]

Routed on top of the airbox, or similar?

Correct. The tubes need to be routed up and out of the way. Typically up near the airbox.

Edit: I just opened the service manual for your bike and there is a specific diagram showing where these hoses route. You might want to open the manual and find that diagram. It's near the back of the manual in the 1982 L model supplement. Manual available for free download off Basscliff's website.

[abaton6]

Thanks Nessim

[chuck hahn]

As Ed said..up and over top of airbox, then down the backside and stuck between transmission and swing arm. reach under and cut them about even with bottom of oil pan.

[abaton6]

As Ed said..up and over top of airbox, then down the backside and stuck between transmission and swing arm. reach under and cut them about even with bottom of oil pan.

Thanks for the info. But I have to ask why? Why not leave the ports open? What is the function of attaching a hose, and going up and then down? Thanks.

[chuck hahn]

Road debris, rain, water when you wash it can get into the carbs easily ...Down nothing can run uphill.

[abaton6]

Road debris, rain, water when you wash it can get into the carbs easily ...Down nothing can run uphill.

10-4 I'm a retired HVACR Tech, I like to know the why of things. Thanks

[EDGECRUSHER]

Just to add to the explanation... I have built off road buggies and one thing you have to do, because the vehicle will eventually end up sideways or up-side down, is route the vent up the frame as high as you can go and then back down below the vehicle. In the event the vehicle is anything but right side up, that vent will continue to function without allowing gas to run out. When it’s put back on it’s wheels some will escape but there will be no danger while upside down of gas flowing and catching fire. I always picture this as why bikes also do a similar thing. Granted it’s impossible to take it higher than the gas tank but it still slows the flow if the fuel has to travel up from the cabs.

[Nessism]

To add a data point to this discussion, Dynojet recommends removing the tubes when running pods along with their jet kits. I think they are concerned that the vent tubes might become kinked and the bike run lean at high speed.

[abaton6]

Correct. The tubes need to be routed up and out of the way. Typically up near the airbox.

Edit: I just opened the service manual for your bike and there is a specific diagram showing where these hoses route. You might want to open the manual and find that diagram. It's near the back of the manual in the 1982 L model supplement. Manual available for free download off Basscliff's website.

Thanks for that. I don't see the manual for the L model. Only the G, and the E. I'll just rout these as you suggested. I got some 5/16 I.D. tygon tubing today.

[Nessism]

Thanks for that. I don't see the manual for the L model. Only the G, and the E. I'll just rout these as you suggested. I got some 5/16 I.D. tygon tubing today.

Your bike is a GS650GL.