First Post. Have had my '91 ST1100 for a year. LOVE IT! Just had to replace a cylinder head coolant outlet nipple that cracked - replaced both sides and hoses while I was under the carbs (thank you Bike.Bandit!!). Now it runs like crap. Rechecked everything. Last night I pulled the 1&3 plug leads - NO CHANGE in idling. Separate 2&4 pulls killed it instantly. I'm running on two cylinders!!! Getting gas and spark on the plugs. Tearing out little remaining hair. All I can think now is that the fuel air is off on one 1&3. Will a synchronization fix this? How do you do it? my service manual and owners manual make references, but no proceudre. Love some help.