Mark Ulm Profile Topics Started Replies Created Engagements Favorites Search topics: Topics Engaged In Viewing 2 topics - 1 through 2 (of 2 total) Topic Voices Posts Last Post Jinma 284 heavy exhaust smoke (blue) Started by: Mark Ulm in: Tractor Troubleshooting 3 7 2 years, 8 months ago DavidPrivett Jinma 284 engine knock Started by: Mark Ulm in: Tractor Operation And Maintenance 6 24 9 years, 3 months ago Bob Rooks Viewing 2 topics - 1 through 2 (of 2 total)