From:Duane Taylor Electronic:duane -A- taylorclassiccycles.com
Subject:RE: 165 ST surges then dies Date:Tue Jul 21 11:35:33 2009
Response to:12743
The description sounds like fuel flow restriction.
If you have a newer tank valve it is a frequent problem as the valve diaphragms were crudely/improperly made. If the valve is original, it still may be a diaphragm failure because of aging.

The valve solution now is a 3/8 NPT brass, on/off valve you can get at most auto parts stores for $10-15. It will do the trick until a good valve comes on the market.
Duane Taylor
duane -A- taylorclassiccycles

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I was riding my '57 165 ST when it started to run erratically- like starving for fuel- then bogged down. It will restart and idle for a bit, then surges and cuts out. I've taken apart the carb and cleaned everything, replaced condenser, checked all connections and it still does it. Anyone have suggestions?