Join Date: Jul 2008
Location: Chiang Mai, Thailand
Decel popping is the result of unburned gas leaving the combustion chamber, mixing with oxygen and igniting brought on by the heat of the exhaust. To ignite, the fuel/air ratio has to be just right or it won't happen. Straight pipes with little or no baffles allow oxygen to get sucked into the pipes on each return pulse of the exhaust. This oxygen will then mix with the unburned gas and the result is decel popping. I'm guessing that when your PAIR system was in place the oxygen it passed into the exhaust port, mixing with the oxygen coming up the pipes, created a fuel/air ratio that was too lean to fire off. You'll soon find out when you reinstall your PAIR system.
I spend most of my money on motorcycles, women and beer. I usually just waste the rest.