Sean,
The switch is under the throtle body-take it off completely to inspect/clean. 
There should be a plastic snap on cover to protect from dirt-if it�s not on, 
the cam lobes get dirty and the switch may not turn on and off correctly. The 
adjustment is simple- no dissassembly required-just loosen the 3mm allen set 
screw (the one with a washer) and turn the 3mm screw next to it to adjust. 
The switch should audibly switch as soon as you give throtle and switch again 
at the end of travel.

Ra�l Cisneros
Nyack, NY
87 Syncro Westy
86 Syncro GL