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having trouble with my is4000.unit bogs down when under load going up hill, thick grass. Seems to be a problem with governor . I have no idea how to adjust, repair or replace it. I think it is internal. Could someone out there pleeeese tell me how it works and how to access it.previously it...

Recently joined fourm, my is 4000 was running great. Suddenly it started to bog down when going uphill and when cutting thicker grass. Under normal circumstances engin would automatically compensate for load and adjust speed. Please help any info would be greatly appreciated thanks in advance.