1950 M carb

41106 · Mar 29, 2010

My M runs good, but seems like when it's really time to lug down and keep going, it falls a little short....not terrible, but not quite what it should be. The governor is in good shape (reman.), dist. is working order. Today, I removed carb bowl to see if the previous owner had something switched or something. While apart, I noticed that at the very bottom of the bowl, in-line with the venturi of the carb, there was a hole. It looks like some sort of plug is in the actual openning of the bowl, but there is also a hole in that plug that is approx. a 1/8" in dia. Now I have two questions. First, will that hole cause some vacuum loss as my engine rpm's fall to the point that it makes my engine die off? Second, what is supposed to be there, or what's the fix? Thank you for your knowledge and help.

Andy Martin · Mar 29, 2010

The hole in the bottom is a drain hole to let excess gas out when needed. It should have a felt in it to keep from drawing dirty air in but many of them are missing.

Try opening the main jet 1/4 or 1/2 turn at a time. It is adjustable to match the load you are on. With the engine loaded you should open the screw until you just see a little black smoke (very little) then close the screw half a turn. When you are done plowing or whatever turn the screw back in for the lighter load jobs.

1950 M carb

41106

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Andy Martin

Well-known Member

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