walbro carb rebuild question

[bigJake]

I have the carb for my chainsaw apart to rebuild and the rebuild kit contains 2 silver cupped discs that correspond to what I drew the red arrows to in the attached pic. The pic is not my carb but makes the point. the disc on top in the pic is gold, mine is silver and looks the same as what is in the rebuid kit.

I don't know what they are or how to get them out to change (or do I not have to?)

In addition to the pump diaphram and gasket, the metering diaphram and gasket, filter screen, needle, lever and pin, my rebuild kit also has these 2 cupped discs, a very small screen about 3/16" diameter, a retaining ring the same size and the small screen and a gasket that looks like a 1/4" washer.

since I dont know how to remove the silver discs, I don't know if these other things are parts I don't need since it appears to be a generic rebuild kit or are there parts under the discs?

 

[470]

Generally you don't remove those plugs when rebuilding. They are covering passages that had to be machined into the carb when made and have no serviceable parts under them typically(some have filter under them). Some kits have replacement disc some don't. The disc can corrode over time and leak, this will cause tuning issues. I would rebuild the carb and try it, if it can't be tuned or seems like there's a dead circuit then I would drill out the disc and look for corrosion in the passages. If you need to drill it out. Carefully drill a small hole in it and use a hook tool to pull it out. Those plugs are actually called welch plugs.

 

[bigJake]

Thanks very much. The original plugs look to be in very good shape so it sounds like I should be good to leave them in.:cheers:

 

[LouDoo]

Jake, Does Pa know bout you usin one of the new fangled chain saws?

http://www.youtube.com/watch?v=mL7n5mEmXJo

http://www.youtube.com/watch?v=aiVOG199X2c&feature=related

Lou

 

[bigJake]

Lou,
You knows Pa says I'm too dumb ta use one a them there chain saws. I just took the carb off the chain saw ta run on the truck whiles uncle Tony works on the truck carb.

 

[Dr Honda]

Just to verify 470... don't take the plugs out. But, if they are loose, or corroded... then you can replace them.

 

[bigJake]

thanks guys.