1st time DIY Weber rebuild advice?

[deathpunk dan]

Hello
I will be rebuilding my pmo webers as soon as the rebuild kit and other misc parts arrive. I do have the Haynes manual and the 101 projects book, as well as print outs of the exploded views of typical Weber 40s (which I assume are extremely close to the PMO ones, especially for reference sake).

The only carbs I've ever worked with are various Keihin and Mikuni motorcycle carburetors.

I'm not worried that I will be in over my head per se, but was wondering if those of you that have done this job before have any specific advice or tips?

Thanks

[Rich76_911s]

Be careful when you loosen the copper nuts and bolts. Copper is a fairly soft metal and will strip easily. IF you strip one you can find replacements easily and cheaply at:
http://youroil.net/weber_carb_parts.html

*I don't think pelican carries those parts. If they do I will gladly edit that and inform you of where to find them in the pelican catalog.

The other hitch that I ran into was that the gasket set I bought from pelican didn't fit that well. I don't know if the gaskets should be soaked first to soften them up a bit or what the solution to that problem would be.

Other than that take pictures of the order of things as they go on the accelerator pump. Actually here is a picture of the accelerator pump for you:




When you are done rebuilding them t-bird gives a great deal of information on tuning carbs half way down the first page of this thread:

Weber rebuild

Good Luck
Rich

[dweymer]

Be very careful if they have been sitting. I ruined a body by breaking off 2 main jet holders, and an idle needle. I drilled out one jet and could not get the others out.

[katigbr]

Just rebuilt my Weber 40's this past weekend. Fairly straightforward. The only challenging part was removing the float valve caps (2 per carb). The easiest method I found was to loosen them while still attached to the manifold. Not sure if PMOs are different.
Other than that it was a straightforward remove, clean and replace gaskets. I used a combination of brake/carb cleaner for most of the bodies and used vinegar soak and brushing to clean the jets. All parts/assemblies were blown out with compressed air prior to reassembly.
The best advice I can give is have a wide clean worksurface available so you can lay everything out in sequence when you disassemble then match the replacement gaskets/parts ahead of time to reduce the guess workwhen reassembling.

I did find a stuck accelerator pump valve and "popped" it loose with a plastic pen cap tip (gently). Soaking in vinegar and compressed air did not loosen it.

No real problems or mysteries to solve.

[shbop]

How many actually remove the throttle shafts, and if you do, how difficult was re-assembly? I'm concerned with ruining the plastic bushings, while soaking the carb body.

[Mo_Gearhead]

Shbop

I've rebuilt many carbs. over the years, including my Webers. I would NOT recommend a DIY home removal of the throttle shafts. If the shafts are worn and need to be replaced or bushed ...IMO send them to a qualified Weber or PMO expert.

[Rich Lambert]

Be careful tightening the float bowl drain plugs, they're hollow soft metal and can snap off pretty easily.

Yes, I did that.