The 1949 would have had a Carter type W-1 as original. The Carter YF is a replacement.
Carter used a number of different springs. You will need the Carter identification number of the carburetor in order to acquire the correct spring.
Jon.
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
