Signature 600 chuffing

[Rawze]

pull the boot between the CAC and the intake manifold and crank it up... see if you can hear a distinctive "pop" "pop" "pop" in the intake,.. maybe you have a valve not seating properly?

also run engine on one cylinder at a time after doing...

* An overhead valve adjustment. While your in there, make sure you don't have any sticky engine brake pistons or some other dumb thing.

* followed by an injector leak test. https://youtu.be/Wu_WN8BA-LA

* followed by running the engine on one cylinder at a time to ensure they are all firing the same strength. https://youtu.be/FggtTj645DQ

it is not rocket science,,.. if it passes all that with flying colors then it is not likely anything mechanical inside the engine itself.