Deutz MAG SA diesel poor starter F1L 210D

Does anyone have experience with these, I have this engine and before I pull the injector so see whats happening I thought I would ask if some of you guys have worked on these in the past, its a pig to start on the starter, it takes lots of spinning before it fires, at times it hits a spot when its just getting enough fuel to take the load of the starter but not enough to run,  I go out later and have a look to see if I can improve it, it should fire in one or two revolutions,

Tappets checked, fuel lines checked and new filter fitted,

Chris

Cancel the request, I think I was loosing compression at the injector copper washer, its starting a lot better now, still not as quick as some I saw on youtube though,

Update, its not really starting any better, it did after I pulled the injector and put it back together but after a week lying it again took a fair bit on the starter to get it to fire.