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Im going to kick myself, I know..

  • Thread starter Thread starter Planetsmasher
  • Start date Start date
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Planetsmasher

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It seems like one of those questions that has a simple answer but its beyond me.

I have done a by-the-book carb disassembly and clean and I am trying to fine tune a bit before I put it back together. My tank is off and to the side and I have a length of hose so that I can use the real tank as my remote tank while I play around. I turned the petcock to prime to fill the bowls, but nothing would flow through the hose. I know it is not the petcock, because when I remove the hose from the petcock nipple, fuel flows out of there like hell wouldnt have it. So it seems like there is an air lock. However aren't the vent hoses (X2) on the carbs meant to allow for liquid to freely flow through the system just like a plumbing drain stack?
 
How long are you waiting with the petcock on PRIME? If things are working properly, fuel flow should stop rather quickly.

Does fuel flow if you remove the hose from the carb side?
 
are the carbs fuull? if so its normal for there to be air. open the drains on one of the carbs.
 
lol, i really dont know mate. are you sure you have the pipe connected up on the carbs correctly? i am guessing now as i have no idea why the fuel shouldn't flow?
 
Yes, the petcock is definitely letting fuel through, and the hose is brand new transparent hose.. so there are no blockages from gunk or debris. I can see through the hose, so I know it's not moving through unless I take the hose off momentarily at the carb side and let some air in.
 
give the bike a good shake from side to side and tap the float bowls with a mallet and see if that helps at all
 
Yes, but I did make my own gaskets which is making me nervous. I traced them from the one surviving gasket I salvaged from the tear down, and I was pretty fussy with it, but you never know.
 
Does the hose dip lower than the carb fuel inlet tube?
If it does you may have to "prime" it. You know, sucking on the end of the hose to get the gas moving to the carb, like syphoning.

I had to do that with this redneck set-up. (make sure you choose a good flavor of gas).
 
I had quite a short pc. of tubing so I didn't need all that razamanaz... I don't know what the frick now. I had those carbs sitting on a bench for a week waiting for Mr. Barrs O-ring envelope (which came tickety-boo, thanks very much Robert!) and was stoked to get it all up and running again. I am now soaking my sorrows in a glass of whisky and conceding defeat (for today). son of a bitchin thing.
 
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Take the carbs back off, flip them over so any fuel in the bowls will run out the vents and shake them around a little to be sure they are drained.

Remove the bowls and one by one, VISUALY verify the float needles move up and down and do not hang up..do this a dozen times per carb to be sure they are faultless. Hold the carbs upright as you lift and drop the floats.

Next, recheck the float to be sure the innner edges of the gaskets are not snagging on them. Also check that the floats are in the right way. Youll notice that there is a little tab bent at a 90 degree to the brass base plate. This tab stops the floats from falling too far down and allowing the float needles to fall too far and jam up...or fall completely out!!.

The tab should be visible right against the one post the float hinge pin goes thru. If you do not see this tab against the posts, flip over the floats and recheck the float hts..with no gaskets installed in the carbs.

Recheck the float ths anyways since the bowls are open again.
 
I believe it's together right..

I believe it's together right..

Chuck, does this look about right? I checked everything. The gaskets might have gotten in the way, but unlikely. I will trim up new ones anyways with absolutely not a mm extra just to be sure. Hell, maybe the flaot bowls were simply full, and my problem with starting is from something entirely unrelated to carbs.
 
Another look..

Another look..

All of them this time, and no I didn't forget the air filter. That is the old one I replaced.
 
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