70 hp Johnson Won't go into high speed untill idling for 10 minutes or so

by Mike
(Cleveland, Oh)

After fishing for a while my 78 Johnson my 70 hp starts readily but won't go to high speed, almost chokes out but finally picks up good speed, if I stop then it will do the same. when I first start the day it seems fine. Is something over heating or is some other problem with the timing? Always had to warm-up but getting much worse

78 Johnson, 70 HP
Mike Novak Michaeloh9@sbcglobal.net
Hope you can help, Thanks

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