I personaly never mess with tapping threads and trying to find the right bolt and all. I simply use a self ----DRILLING screw with a hex head. I put it in a battery powered drill and spin it in till it is snug, then wrench it out the rest of the way. I should add a fender washer works good to put on the screw. Always check with your finger to make sure it is moving as you tighten. Heat is always your best friend with those carbs.
That nozzle in simple terms is what gives the tractor a extra shot of gas when you dump the throttle fast so it does not sputter.
I always bead blast every carb, including the nozzle passage before I try to pull it through all that rust, as a common sence issue.
I think three different carbs have showed up with taps broke off inside, then I get to try to fix them. I feel selfish always wishing I got to try first before they twist off every drill plug etc. Taps are very hard steel and you have to heat them a few times to soften the tap.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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