It was for someone who had a carbed bike be he did an excellent job explaining it :cheers thanks again RedlineRedlineR6 said:Yep, you're right. It is unburnt fuel, just like on our FI bikes with AIS. I don't even know if the 99-02's have a AIS system, but on our bikes, the AIS system creates a "LEAN LIKE CONDITION OF A CARBED BIKE"
It happens on decel because you just got done literally COOKING your headers (HEAT).....theirs always enough unburnt GASOLINE along with other BY-PRODUCTS of combustion such as CO which is also a flammable gas (FUEL)....... no one ever thinks about other flammable products other than gasoline.
So you have HEAT, FUEL, what about the oxygen? When you get the right mixture of all....WOOF, or in this case a backfire sound.
On bikes WITHOUT AIS systems, it's hard to say where the correct amount of oxygen is coming from. It can only come through the intake or exhaust. Which is another reason why aftermarket exhaust might make it more noticeable for they not only breath better going out, but in, it could be a possibility.
On FI bikes, no better reason than to blame it on the gay ass AIS which is intended to give it the right O2 for combustion in the exhaust ports and pipe. I'm a firm believer in not adding emission shit. Old fashioned.
Ok.......so you get that i hope.
This is all depending on the condition of your valves...exhaust valves to be correct. If you are noticing constant popping through a wide range of deceleration, one of the exhaust valves is not seating and your combustion chamber now extends into your headers... Make sense?
One, maybe a couple quick pops right after a hard run is normal, you get many of them, you need to start seeing if you have a seat problem, weak springs, bent valve etc... Or just a lean condition that is causing everything to reach much higher temperatures.
I'm betting that it's just a regular deceleration pop, but if you think it's a valve issue you need to have a leak-down test done, don't just go tearing into your engine.
Sorry guys, i'm a freak. :drink
Sorry if i forgot anything, I got into NOVEL MODE....