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Gents,

Im full of questions today.

I have one weber weber That doesnt respond to mixture screws turned all the way in, or idle adjustment screw. No response at all when turned all the way in. I then went to clean both carbs with carb cleaner and one carb would bog down after spraying in and the other (one that doesnt respond to mixture screw adjustment) didnt do anything.

Just looking for ideas on what I can do to remedy this. Thanks in advance.

IDFs (by unfortunate design) funnel anything (water, dirt) that gets by the air cleaners and on top of the carb into the idle fuel circuit, typically blocking the idle fuel jets.

Gauze filters pass fine silt and sometimes much larger even when new and properly oiled. Be aware...One used to be able to buy truly effective synthetic media filters for Webers, but I guess no one "got it", and they were discontinued.

Water can also enter this way, and cause corrosion.

There are several aids for this:
K&N sells a thick silicone grease for use on the rubber air filter seals top and bottom.(I have yet to find this stocked)
Energy Suspension sells what looks to be the same goo for urethane suspension bushings, works well.
Autozone at least carries this, and can be had in a large tube for ~cheap.

ANY sort of thick grease will be an improvement: I used CV grease for awhile.

There is also a product called "Jet Doctors" that act as snorkels for the idle circuits to eliminate the issue.
One should still use the goo on the filters, I RTV'd the lid on mine and just used goo on the bottom.

If your air filters can see rain or a car wash, gauze air filters are ~transparent to water (some would argue to dirt as well...) , and the carbs can fill up, so you need rain covers...

I used Bakers Secret loaf pans, worked great, black teflon coating looked OK.

Piledriver wrote:IDFs (by unfortunate design) funnel anything (water, dirt) that gets by the air cleaners and on top of the carb into the idle fuel circuit, typically blocking the idle fuel jets.

Gauze filters pass fine silt and sometimes much larger even when new and properly oiled. Be aware...One used to be able to buy truly effective synthetic media filters for Webers, but I guess no one "got it", and they were discontinued.

Water can also enter this way, and cause corrosion.

There are several aids for this:
K&N sells a thick silicone grease for use on the rubber air filter seals top and bottom.(I have yet to find this stocked)
Energy Suspension sells what looks to be the same goo for urethane suspension bushings, works well.
Autozone at least carries this, and can be had in a large tube for ~cheap.

ANY sort of thick grease will be an improvement: I used CV grease for awhile.

There is also a product called "Jet Doctors" that act as snorkels for the idle circuits to eliminate the issue.
One should still use the goo on the filters, I RTV'd the lid on mine and just used goo on the bottom.

If your air filters can see rain or a car wash, gauze air filters are ~transparent to water (some would argue to dirt as well...) , and the carbs can fill up, so you need rain covers...

I used Bakers Secret loaf pans, worked great, black teflon coating looked OK.

Thanks piledriver, looks like I need to pull carb and do a cleaning!

You will probably be able to get away with simply pulling the idle jets and blowing them out.
I assure you that gets old, even on a 914 or other vehicle with easy access.
Sealing the air filters properly helps tremendously, the typical CB air filter bases are quite rough as-cast surfaces.

On a T1 with a full body that hasn't been "ventilated" or had jet access doors added (they are a thing) it pretty much requires pulling the carbs to do much.

Hi JMaster,

Webers are great performers, but take a lot of work to keep clean.

There are a few lucky people who can just slap filters on them and they work, but not us. The fouled idle jets alone will have you cussing Webers.

We finally had to just shelve our 44 Webers and go entirely to Kadrons for racing. What we lose in overall performance we make up for in time-on-track with carbs that work.

On trick we found was to wrap some shop towel fabric around the jet stacks which greatly helped keep debris (tire rubber, sand, etc) out of the main jets and because the shop towel covered the idle jet intakes, protected them as well.

FJC