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My low-hour but out-of-warranty GC1705 has developed hesitation and stumbling at power above 1800rpm. Did the basics: drained and flushed tank, new filter, bleed everything to the Injector rail, had the injectors cleaned and tested, all with no effect. Only clue I have is that when you first...

Besides the higher RPM to get the additional 2.5 HP, what is the difference between the GC1705 and the GC1715? (besides the $1000 price difference). Dealer says they are the same (but only has the GC1705 so that is what he is pushing). I swear the seat looks very different in the brochure for...