by Mutt » Fri May 12, 2023 10:12 am
Ok, to start off with, prior to 1958, NO 125,165 or HUMMER came from the factory with a brake light switch; unless it was specifically ordered with one, one installed by the dealer or bought as an Accessory and installed by the owner. Look at any Factory Pohlman Studio photo. BUT, 1955-57 B models never came with a brake light switch regardless. They were never offered for 55-57 B, because of the problem you have. The magneto didn't put out sufficient current to run the motor and the high draw of the 21c.p. tail light bulb. In 1958, the Department of Transportation mandated that ALL vehicles sold in the USA MUST come with brake lights. Harley then resigned the ignition system, removing the ignition coil of the 55-57 B model and installing a lighting coil in place of the former and a standard external coil under the tank. Problem was solved. A 125 should have at least 90 psi, but will run will far less, say maybe 55 or 60 psi. Is the motor rebuilt? Did ya install new cranks seals? Were the crank shafts pitted or grooved in the area on the shafts exactly where the seals ride? Did ya start with the lower (high speed) needle out 1 full turn from lightly seated? Do you have the correct main nozzle and tube in the carb? Is the carb the correct model or equvilent (MT43A)? What happens when you open the lower needle up 1/4 turn more or 1/4 turn less?