This is a thread in an attempt to curb all the double posting as well as provide a centralized solution for individuals to find what they need to do to correct the issue...
So you are riding your 4th Gen and feel a cylinder drop out while riding and your inline 4 now feels and sounds like you're riding a twin. This is happening irregardles of what you were doing and how long you have been riding. The problem seems to come and go, uncommanded.
-There is an issue in the firmware versions that is causing one of the cylinders to drop off and basically stop functioning.
How to fix?
The only two verified ways to stop the issue, is upgrade your Dynojet firmware to either the 1.6.10 or 1.9.2 versions. If you have a Secondary Fuel Module (SFM) this will need to be updated as well.
Where can you get the firmware versions?
You can get the latest official release from Dynojet:
These versions are hosted separately. Testing results are in bold. (Updated 27JUL13)
1.6.10 --> https://dl.dropboxusercontent.com/u/...0V0.1.6.10.zip Confirmed to work
1.9.0 --> https://dl.dropboxusercontent.com/u/...o_V0.1.9.0.zip Issue still potentially exists with this version, use 1.9.2 instead!
1.9.2 --> https://dl.dropboxusercontent.com/u/...o_V0.1.9.2.zip Confirmed to work
1.10.4 --> https://dl.dropboxusercontent.com/u/..._v0.1.10.4.zip Untested as of 27JUL13
1.10.6 --> https://dl.dropboxusercontent.com/u/...1.10.6.pvu.zip Untestested as of 14JAN14
188.8.131.52 --> http://www.powercommander.com/downlo...5_v184.108.40.206.zip