I have the 7021, model 917-376823 and according to the manual, it is also supposed to have a fuel shut-off but I cannot find one. I have to do work on it because it stopped running properly after a few months of use, mowing 1 - 3 times each month. That shut-off valve would be useful. I also wondered if its ommission from the product is contributing to my problem of the mower only running for a few seconds before stalling.
Roger,
I cannot tell you how to modify our machinery. I can only offer advice to bring the equipment to factory specs or tolerances. I do not know how this shut off would effect the unit.
Thanks for your question