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Author Topic: Carburetor and intake hose connections  (Read 258 times)
teppist
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« on: October 06, 2017, 01:06:03 AM »

Hi guys,
I'm having some troubles looking at my carbs that I removed for cleaning due to flooding on bottom carb.
I notice that on the intake manifold there are 3 hoses....one on the top and two on the bottom...
I have an hose that connect top to bottom and the middle is connected to a closed plug on the carb.
Can anyone tell me if these connections are correct?
Looking at the parts manual it seems that there are also an hose connection from air filter....(missing on my bike)..where is this tube connected?
Thanks in advance for any help!
Andrea
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tightwad
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« Reply #1 on: October 06, 2017, 09:02:08 AM »

The hose that runs from top to bottom is to oil the top bearing, it has a one-way value in the middle.  The other nipple goes to the bottom of the air intake and is used to suck pooled fuel back in to be burned, so it doesn't leak into the hull.
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teppist
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« Reply #2 on: October 11, 2017, 02:13:09 AM »

Looking around on the net i found this pic with hose connected....It's different from mine....is that correct?
Are all 3 plugs connected to the manifold or there are someone closed?
Thanks
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teppist
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« Reply #3 on: October 11, 2017, 02:40:48 AM »

the other side....only two holes from outside Huh
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T Rush
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« Reply #4 on: October 13, 2017, 07:05:39 AM »

the third one does have a hole on the inside...but its just a tiny pin hole
...its there to connect a hose to the bottom of the plastic airbox, and will draw any fuel out that 'barfs' out of the carbs and collects in the airbox
....The other nipple goes to the bottom of the air intake and is used to suck pooled fuel back in to be burned, so it doesn't leak into the hull.

you can cap off that third barb on the intake manifold to prevent a vacuum leak  
...if its not connected to the airbox("air cleaner")...or how someone else did it, connected a hose to nothing/something sealed on the carb


I think this whole system was designed to help with the air/fuel pulsing out of the carbs when the reeds snap shut(I called it 'barfing')
...the hose connecting the top(1st barb) and bottom(2nd barb or "middle") manifold is a balance tube, so when one carb/intake is pulling in air/fuel it can help suck the excess pressure from the other intake manifold so it doesnt 'bounce' back out of the carb into the hull(airbox)

you might need to switch which barb the balance tube is hooked up to in your case(so its like the picture), as you describe in the op that your hose connects to the bottom 3rd barb with the tiny pin hole?
« Last Edit: October 13, 2017, 07:33:54 AM by T Rush » Logged
teppist
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« Reply #5 on: October 20, 2017, 12:42:40 AM »

I'll try to connect hoses like attached pics and once the carb will be rebuilt I'll try to check with balancer....
Also will hook hose from air box as original...
I'll keep you informed.....thank you!!!!
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tightwad
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« Reply #6 on: October 20, 2017, 01:11:56 PM »

I'll try to connect hoses like attached pics and once the carb will be rebuilt I'll try to check with balancer....
Also will hook hose from air box as original...
I'll keep you informed.....thank you!!!!

I have used a balance tool and determined that it's easier to use a couple pieces of stiff wire bent in an L shape.  With the wire long enough to go into the carb and be trapped by the butterfly the L portion should be parallel to the ground.  You can tell if the throttle balance is off when you crack the throttle open slowly, watching for which wire rotates first to point towards the ground.  Adjust the linkage until both wires rotate at the same time.
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