Super 88 DSL engine speed

I am trying to Dyno my super 88 DSL. I find it is only running 1600 rpm with no load. I understand it should be 1750. I know nothing about
theBosch injection pump on here but how do I increase the rpm. The linkage and the external mechanical stop appear to be functioning well
and do not bottom out. Thanks in advance
 
Throttle lever should hit the stop bolt on the governor cover tab when wide open. Speed is adjusted at the top threaded spring stud, has two nuts for 7/16 wrench to streach the spring more for higher speed. Original Ambac spring SP9013 no longer available, Century Spring # C-171 will work in the notes I have. Some one may have replaced the worn original spring with a lighter one..
 
Thanks dieseltech the old spring was definitely the issue. I have 1750 high idle speed I should have now. Unfortunately I only have about 42 hp. So I am going to change the fuel filter. Unless you have another thought. It runs very well otherwise.
 

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