I have a B6100 that will not start. For starters when i purchased the tractor it started hard on the first start. Then once warm it would start every time. So i checked glow plugs an the was bad. I replaced all glow plugs. Then it wouldnt start at all. The starter was dragging hard so i replaced it with a new one. Still no go. Checked made sure i had fuel at injectors, seemed weak so i replaced the lift pump. While i was at it i cleaned the fuel tank, replaced all fuel lines an put a new fuel filter an housing on because it had a crack in it. Still wouldnt even try to fire. Smoked like crazy when tried to start it. So i pulled injectors and sent them out to be rebuilt. Guy said one was plugged up an other two was not spraying right. Put new injectors in, bleed fuel at injector pump, and at injectors. All air out and the tractor will still not even try to fire. Now it has a little bit white smoke when rolling over but not near what was before. I have not checked compression yet. Everyone ive spoke to said compression is not the issue in this case. Tried pull starting and wont even try to fire that way either. Im at a stand still an am looking for any advise of what i could check next, try, anything before i take a hammer to it. Thankyou