1st time DIY Weber rebuild advice?
 

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

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:

http://forums.pelicanparts.com/uploa...1190121692.jpg


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:

http://forums.pelicanparts.com/showthread.php?s=&threadid=67957&highlight=Weber+R ebuild

Good Luck
Rich

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.

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.

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.

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.

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

Yes, I did that.