MODEL 125 and MODEL 165 CARBURATOR (marked "L&L")
There were several models of L&L carburators used on the Model 125s and Model 165s. See the Carburator Chapter in How-To-Restore for details.
Before starting the bike, hold down on the Priming Pin (tickler) for a few seconds until gas starts leaking out. If no gas comes out, you've got a clog somewhere - clogged gas cap, clogged petcock, or clogged carburator from sitting for years without running. Once cleaned and properly adjusted, the carburator is seldom the problem.
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The Service Manual contains complete dis/assembly instructions. If you don't have one, you really need one. Harley Part# 99444-93 is available from your local dealer. $40 gets you a Service Manual, a Parts Catalog, and much much more.