Yes I try to look into fuel tank, see what is on the bottom, and drain it into a big pickle jar with a syphon.....if it's bad drain carb.
This one needed a tuneup as it wasn't getting full revs or cutting properly.
Sorted out the blade plate.......
Fiddled with the springs on the B&S 375, got it revving a bit better. Topped up the old, cleaned the air filter..
They only wanted a $25 service and that's what they got.
cheers
speedy

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........................Keep your blades sharp......................