Starting up carb’d monster after 5 years

[joshuajcrouch]

What is vacuum pitting?

The tech was concerned that the pitting at the bottom of the bowls could have compromised the drain screw's ability to maintain vacuum.  Not sure how he would test for that, or how I would verify that on my end.

Once again, I am just repeating what the tech told me.  There is a reason I took my carbs to someone else to deal with

[ducpainter]

What is vacuum pitting?

Something zooom made up.

[zooom]

Something zooom made up.

DURNED TOOOTIN......LOL


thanks for the credit, even if it wasn't me!

[ducpainter]

I hope that this isn't their tactic.  I really cannot see how they can position themselves to charge me more for anything.  If these two ideas they have don't work, you better bet they are going to take another look at the carbs.

He mentioned that the varnish at the bottom of the bowls causes some light pitting, and didn't know if that could effect the vacuum.  That is why he wants me to try swapping the drain screws.  Seems a little odd to me.

if he in fact did the highlighted and underlined portion....and he set and balanced everything, then the supposed vaccuum pitting problem would have revealed itself at that time would it not?....I am not a carb expert...I am just asking in the basis of some practical line of thinking

DURNED TOOOTIN......LOL


thanks for the credit, even if it wasn't me!

was too you...

you said vacuum but meant varnish.

[zooom]

ooh...I guess I did mess that up...that's what I get for working at the same time as posting...LOL

[Howie]

Something zooom made up.

I was more curious how pitting on the bottom of the float bowl affects vacuum

[JoeB]

I am more curious as to why the tech guy thinks there should be a vacuum in the float bowl 

[ducpainter]

I am more curious as to why the tech guy thinks there should be a vacuum in the float bowl 

...because this was the first carburated bike he's ever worked on?

[joshuajcrouch]

...because this was the first carburated bike he's ever worked on?

Thank you guys for all the support   I will let you know how the next conversation goes with this Tech...

[joshuajcrouch]

I am wondering now if the Tech meant that the bowl drain screw wasn't seating properly.  After I pulled the drain screws I noticed one is slightly shorter than the other.  Now I am curious to know how the overflow works?  Does it share the same line as the drain screw?

I drained the bowls and swapped the screws around.  Still drips out of only one side of the overflow.  Swapped the screws back around and it still only drips out of the same side.  If the issue was the screws, wouldn't the overflow change to the other side when I switch the screws?

I also noticed that once I cut off fuel to the pump and let the bike run off the fuel in the floats the dripping stops.  Once I hooked my fuel source back up to the fuel pump the dripping starts again.

I also tried tapping the carb bowls and still NOTHING.  Looks like I have to tear this thing apart again.  I am getting really tired and need a breakthrough!  I am sure you guys are tired of me posting on here as well...

[JoeB]

I am wondering now if the Tech meant that the bowl drain screw wasn't seating properly.  After I pulled the drain screws I noticed one is slightly shorter than the other.  Now I am curious to know how the overflow works?  Does it share the same line as the drain screw?

I drained the bowls and swapped the screws around.  Still drips out of only one side of the overflow.  Swapped the screws back around and it still only drips out of the same side.  If the issue was the screws, wouldn't the overflow change to the other side when I switch the screws?

I also noticed that once I cut off fuel to the pump and let the bike run off the fuel in the floats the dripping stops.  Once I hooked my fuel source back up to the fuel pump the dripping starts again.

I also tried tapping the carb bowls and still NOTHING.  Looks like I have to tear this thing apart again.  I am getting really tired and need a breakthrough!  I am sure you guys are tired of me posting on here as well...

Could be more than a few things there…

1. fuel pressure too high, solenoid / tap not shutting off properly
2. needle / seat damaged not sealing properly - overfills and leaks
3. float level set way too high - overfills and leaks
4. your carbs need a proper rebuild by someone who knows what the f*k they are doing


EDIT:  Back in the days of gravity fed carbs, on older bevels and BMW's Lavs etc, you had to turn the fuel tap off or this would happen. instant flooding. You only did it once, because filling a cylinder full of fuel and having to pull a plug and kickstart it out all over the engine taught you to remember to turn that useless f*ker of a fuel tap OFF.

boy does that bring back some memories...

[Howie]

Did I miss the video???  That hose is from the float bowl drain.  Screw is not sealing.

[joshuajcrouch]

Did I miss the video???  That hose is from the float bowl drain.  Screw is not sealing.

Haha this is exactly why I posted the video.  Did no one watch it?  Yes the drips are coming from the same line as the float bowl drain.  Doesn't the drain share the same line as the overflow?

What still doesn't make sense is that when I cut off my fuel supply to the pump, and let the bike run off the fuel in the bowls, the dripping stops.  I was really convinced this had more to do with float levels.

[RAT900]

maybe some FCRs will solve the problem?

[JoeB]

Did I miss the video???  That hose is from the float bowl drain.  Screw is not sealing.

I think we both did.