an update is in order - title no longer reflects the progress of this issue - and wanted to save you all from reading all the pages to get up to date
1. not stranded anylonger
found c60 injector missing "crown" tip - effectively dumping fuel at all times
replaced with c65
bus ran alot better - a bit of smoke while running
2. smoke still increases with accelleration
way less smoke - no longer "obstructing traffic"
doesnt smoke much until fast idle comes in - and while driving
used to smoke for about 30 - 60 seconds (depending on temp) as soon as it starts but then clears up
3. discovered the bus is no longer getting up to temp
used to be just fine - was fine after for couple hundred miles after injector replacement
found faulty thermostats
replaced with 170F - DD Powercool 50/50 - flushed it out really good - really good
bus runs at 180 again
- and stays there (so far) (just tested today - hope it stays good)
4. isolating smoke issue removed airboxes and found liner parts from an apperently "old injury"
used scope to look in cylinder - liners are in tact and look smooth and shiny
heads dont look beatup
still havent found the injector tip
5. want to check compression - ordered kit from HF - cant wait
So that is where were at now - thanks for hanging in there with my newbie questions. I havent worked on a 2 stroke since a kid (repairing 50cc mopeds). This is alot more metal. I have the original MCI parts and maintenance manuals as well as the electronic version of the DD v71 manual. So im working "from the book" on this stuff and with all your help will hopefully I get to the root of this issue. I would really like to not have to repower this thing. People say if you take care of these old Detroit 2Strokes they will run forever.
Also the bus draws a croud at truck stops - everyone loves to her the Detroit Diesel roar.