Join Date: Jun 2017
Location: Denver CO
Model: GL1500 Aspencade 1980 GL1100 STD Vetter
The end of the camshaft where the fuel pump lever rides is round, but it is off-center (eccentric) so as the cam turns it works the fuel pump.
The timing belts really should be changed on that 1100 unless you know they've been done recently. Plenty of "How-To's" to do it yourself. And while you are in there it isn't that much more to change out the camshaft, the 1100 is relatively simple in that area, no hydraulic lifters to mess with. You will want to readjust the valve clearance settings before you button it up. There's "How-to" articles on that, too.
Seems to me though that the 1100 should run just fine on the electric pump. It's possible your rough idle is nothing more than the rebuilt carburetors needing synchronized. If "Carb Carl" is local, take the bike and see if he'll synchronize them for you.
Do fill in profile, maybe there's another member nearby willing to help!
1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL1000 (2002-2006) sold
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)