Carbs
- Thread starter kruzer52
- Start date
Brett Proctor
Well-known member
Fuel filter plugged #7
Needle Valve stuck #53
Float level wrong
Needle Valve stuck #53
Float level wrong
letterman7
Honorary Admin
Do you have constant pressure of fuel to the carbs? A pressure valve on the line (if you don't - you should - set to no more than 3.5psi)? New (cheap MX carbs) or good used (Italian) carbs?
letterman7
Honorary Admin
Get a rebuild kit for them. You'll need to pull the tops off to reveal the float chamber and the gasket there may not come off in one piece. If they were just run and stored without any kind of prep, all kinds of things could be gummed up. In any case, personally I would pull the tops off and, without the coil hooked up, put power to the fuel pump and see if the float chambers fill. Be careful, of course, but the gas shouldn't spill over if the floats are set right. If gas fills the chamber, then you know you have other issues like clogged idle jets and/or passageways. Like Brett said, it might just be a stuck float valve, but you'll still need to access the floats to fix that.
Peter
Active member
Apart from getting an exploded diagram, jot down a note of each part, location and ref# if any, as you go, then resemble in reverse order.
Never had a Weber apart as DellOrtos are more popular here. but on the Dells you need to take care not to loose the tiny ball bearings in the accelerator pump tubes.
Never had a Weber apart as DellOrtos are more popular here. but on the Dells you need to take care not to loose the tiny ball bearings in the accelerator pump tubes.
letterman7
Honorary Admin
letterman7
Honorary Admin
Maybe. If they've been sitting, and you don't know the history on them, the alcohol in the gas could have eaten away some of the rubber inside, like the accelerator pump assembly. You could try taking off the feed hose, tuck some cloth around the base and spray carb cleaner into the inlet feed. There should be a screen filter (large nut at the feed on top - see 7-8-9 in the diagram) so you'll want to remove that, clean it, then shoot the cleaner in. Hopefully that will work loose any gunk, but really, if it isn't getting any gas at all, they should be torn down and gone through. No sense in knocking debris loose to get caught up in the little ports and causing more issues. Theoretically (and I've done this, but certainly not recommended) you could soak the entire carb in cleaner or lacquer thinner and just shake loose whatever comes out. Work the accelerator pump a few times to make sure the mains are clear; idle jets and float valves you can't do much without removing those.
letterman7
Honorary Admin
*thumbs up* Plugged circuits it is, then. Get the specs on the float levels while you're waiting - might as well set everything up right since you'll have them apart.
letterman7
Honorary Admin
That's the ethanol at work in the gas. Make sure you blow out all the passages from the bottom upwards with a can of carb cleaner. Don't poke anything into those progression holes other than the cleaner nozzle!