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199 Model 1931 Carb Questions

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tomj View Drop Down
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Joined: Jan/27/2010
Location: los angeles
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Aug/13/2019 at 8:59pm
OK well i guess i'm a party pooper! lol

i just read the entire thread again.

it's good that you got AutoLine to send you the correct throttle shaft that accepts that front-mounted return spring. it's a safety hazard without it.

if you are still unable to make it idle right, next time you have the carb off, see if the throttle shaft is loose in the body. it should not "rattle" or have excessive play. that will leak enough air at idle to prevent proper idle mix setup.

on nearly any carb, the idle mixture screw setting should be fairly "sharp" -- when you're close to the right mix, 1/4 turn too lean (screw in) will audibly drop the idle speed. (quarter too rich will be "softer" but should also drop idle speed.) i don't know the 1931's; but the mix screw should not be out more than two turns. if it is, that's also indicative of air leak.

on mine, the linkages around the two idle speed screws ("stop" screws, the left/front one with the big w3asher is all-warmed-up idle speed (speed, not mix) were wrong or bent. there's a little bent tang on the throttle lever that was striking the choke unloader (the lever with the weight towards the valve cover) and causing the choke to move and increase speed. it was hard to see and visualize. i had to bend the throttle lever to increase clearance. this should absolutely have been caught by even a modest rebuild job; operate the linkage to check for interference. sheesh.

i'm dismayed with AutoLine. junk quality.

i bought parts for my Carter YF from Mike's Carburetor. i emailed them abourt the flat-accell-pump-rod Holley 1931; they have no parts for it. so i bought from Rockauto hoping i'd get a round-shaft carb, but instead this junker (already sent back).

Mike's is a small shop. quality all around. no bull. and no replacement parts for the 1931.  at least they didn't lie to me.

if you ultimately give up on this carb, there is a Carter YF with the right throttle linkage. it's a far, far better design, parts are widely available. the catch here is that the air cleaner for the 1931 will not fit. you'll need an air filter with a 2-3/4" opening. it's only slightly taller. i had to bend the choke stove to fit. 

Edited by tomj - Aug/13/2019 at 9:03pm
1961 roadster american, 195.6 OHV, T5
1968 american, 199ci, T96

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