Yamaha R3 Forums banner
1 - 9 of 9 Posts

Registered
Joined
2 Posts
Discussion Starter · #1 ·
Hi, Im new member and Im writing here for some questions about my little r3. Since I changed the stock air filter with a bmc one (not race) and since I put the arrow pro race slip on, I heard some popping sound during my ride. It's not the classic popping sound while decelerating because when I completely closed the throttle, I didn't hear nothing. The popping sounds arrive when I reopen the throttle partially (5/10%). It's like unburned fuel from the previous acceleration. If the bike would running lean I think that the popping sounds would be while decelerating but with throttle completely close. It could be the pair system with fresh air that cause all this situation? Or is it simply unburned fuel? Thanks to all and sorry for my bad english馃ゴ
 

Registered
Joined
1 Posts
i have Akrapovic full system exhaust and OEM filter but every now and then when i deaccelerate, the bike makes that popping sound. I have been told in R3 forum to go for any free flow filter and if possible ecu remapping or flash. i am not using my bike on track but just on the highways. So based on few discussions i feel that one should replace oem air filters with free flow and a full system exhaust or else just let the entire machine stock.
 

Registered
2016 Yamaha R3
Joined
174 Posts
Hi, Im new member and Im writing here for some questions about my little r3. Since I changed the stock air filter with a bmc one (not race) and since I put the arrow pro race slip on, I heard some popping sound during my ride. It's not the classic popping sound while decelerating because when I completely closed the throttle, I didn't hear nothing. The popping sounds arrive when I reopen the throttle partially (5/10%). It's like unburned fuel from the previous acceleration. If the bike would running lean I think that the popping sounds would be while decelerating but with throttle completely close. It could be the pair system with fresh air that cause all this situation? Or is it simply unburned fuel? Thanks to all and sorry for my bad english馃ゴ
Keep in mind that on the R3, when the throttle is completely closed, the fuel injectors cut as well (hence the abrupt deceleration). This prevents any sort of combustion, just spark plugs firing into atmosphere and/or vacuum in the cylinder. You are likely experiencing the same thing as you would when decelerating with a rich mix. No fuel means no combustion or hot gases flowing to the exhaust system. The injectors start firing again when you open the throttle and an ignition source is introduced into the exhaust system which still has unburnt fuel vapor in it. This is 100% conjecture but I feel it's not unlikely. Slip-ons generally don't impact A/F mixture, as you still have the restrictive header in place. You probably are just experiencing this as a function of decreased backpressure and increased dwell time for these vapors.

i have Akrapovic full system exhaust and OEM filter but every now and then when i deaccelerate, the bike makes that popping sound. I have been told in R3 forum to go for any free flow filter and if possible ecu remapping or flash. i am not using my bike on track but just on the highways. So based on few discussions i feel that one should replace oem air filters with free flow and a full system exhaust or else just let the entire machine stock.
Your A/F mixture is likely off. The stock exhaust is obviously a lot more restrictive than a full exhaust. A freer flowing intake would likely just exacerbate the issue, as that is the current bottleneck for more combustion air. Your stock A/F maps are intended for the stock exhaust. A flash or tune will likely net you more power and better fuel economy. This is why most will recommend tweaking your A/F mixture after a full exhaust.
 

Registered
Joined
27 Posts
Your A/F mixture is likely off. The stock exhaust is obviously a lot more restrictive than a full exhaust. A freer flowing intake would likely just exacerbate the issue, as that is the current bottleneck for more combustion air. Your stock A/F maps are intended for the stock exhaust. A flash or tune will likely net you more power and better fuel economy. This is why most will recommend tweaking your A/F mixture after a full exhaust.
I noticed the same with the OEM exhaust system and a brand new 2023 Yamaha.
Popping sounds allover.

Now fitted a full Akrapovi莽 race system.
But after a few days welded an extra muffler below the engine.
Still lower in weight than the low steel quality of the OEM exhaust, but even more silent.
The Akrapovi莽 only was way too loud for me and the local regulations.
Even on the track.
  • Original system 89 dB.
  • Acrapovi莽 full race system 98 dB.
  • Modified Akrapovi莽 system 86 dB.
I will ride on closed circuits within 2 months and test if the popping has gone.
Maybe next week on public roads.
 

Registered
Joined
11 Posts
Not sure why it's not widely known, but when you make any, even small adjustment to a motor and the exhaust is an integral part, you change performance characteristics and not only the exhaust note.

When a motor decelerates the ecu is programed to burn off unspent fuel at that instant due to emissions. So when you alter the exhaust you have results not intended by the stock ecu and stock piping.

That's why some tunes for cars and bikes dump more fuel at that juncture to induce more of the crackle n pop.

It's just as much a fad with exotic super cars that you canswitch on the fly.
 
1 - 9 of 9 Posts
Top