Originally Posted by fuelmoto

Decel popping can happen for a number of reasons, and there are a number of tuning strategies to alleviate it. Lets say there are absolutely no exhaust or intake leaks and you are getting popping on decel, this can be caused by a lean or rich mixture and here are a couple of tuning strategies to help resolve this phenomenon primarily related to exhaust gas temp (EGT). The most common technique is to add fuel thru a combination of the AFR table, VE tables, and decel enleanment table; a slighly lean mixture will hyper ignite any hydrocarbons in the exhaust stream, by adding fuel you are lowering EGT and in many cases this will take care popping that is present. Note that because injector duty cycle is so small during decel it may take a pretty big change to see results, this is normal and what appears to be a big change in a tuning table is a small amount of fueling under decel. If richening the fuel does not resolve the popping we will try to remove fuel in the same table(s), this will simply put less ignitable elements in the exhaust, however many times the popping will get worse due to the raise in EGT. Another tuning parameter that can be used are the spark tables and closed throttle spark, adding timing will many times reduce decel popping as well. To make things more complicated many bikes use a decel fuel cutoff (DFC) where the ECM turns the injectors off under certain parameters under decel, when DFC is causing popping you need to work the various tables to tune what we call the "landing" when the injectors come back on, and also note that even when the injectors are shutting down it is still possible to get residual fuel causing popping.

In the end while an exhaust leak or tune issue can be the root cause by far the biggest issue and contributor to decel popping is exhaust and muffler design. This all varies by combination however large, open, enormous mufflers & baffles can/will lead to issues. They also "greatly" affect low/mid RPM performance and tunability, an effect of the loss of velocity. Hope this info helps

Originally Posted by OddJack

LA _ Dog,

Thanks for the tip. In quick tune>>tweaks, which boxes should I check before adding 10% to decel? There is adaptive, knock control, close loop boxes.

I am using the stock sensors so the close loop should be checked. How about EITMS and autotune mode?

Originally Posted by LA_Dog

you can check all of the boxes in the Tweak tab, if EITMS is not checked then it's ok to leave that unchecked for now then read up on it later in the WinPV help section. Do not turn on AutoTune.
Go to the fuel tab, add the +10 to decel, then go to spark and add +3 to decel. save, done, ride and test. take a good ride so the bike gets fully warmed up.

Originally Posted by OddJack

Under tweaks tab, the knock box was not available, and there was no "continue" option to change the decel level.

I went under fuel tab and added 7% to decel. Rode the bike and after the temp reached 300 there was no pops, I will check on it tomorrow again.

Any idea why under tweaks there was no "continue" option? Maybe the auto tune was on, I have to check on that.

Originally Posted by LA_Dog

I don't think there are any continue options, you just make settings changes in the different tabs, then save. try going the full +10 on the decel fuel and also do +3 degrees on decel spark.