Well there's no indication of which smokes are caused by what, but if this statement is correct:
If I keep the classfiles I have your explosions but got those smokes only when fuel is burning engine smokes are then thin as you can see in pics where Me-262 burns
it would mean that burning fuel smoke is "blackheavy" which you already have working. If you want to change a different smoke the way to do it would be as described above:
If you copy them all you can then overwrite the text with the text from blackheavy until you have the effect you want, and the ones you don't want you can copy the original text back into the files to put it back to how it was before.
This will enable you to create whatever effect it is that you want.
I cannot know for sure which smoke you want to change but I would GUESS that the smokes you are looking for are "blackheavy" for fuel and "engineheavy" for engine. It is simple to test the effect as described above for all smokes,
blackheavy
engineheavy
blackmedium
blacksmall
enginesmoke
and if you don't like it you can change it back. I estimate it would take less than 60 seconds to change each one.
Good luck!