Actually, this problem applies to ALL DLTX 67-71 carbs as used on late A's and B's. John Deere knew about this back in the 1950's and issued Service Bulletin 216, (206?) showing a mickey mouse fix. Their fix involved fabricating a brass jumper tube from the rear of the vent passage over to the other side of the body, thus creating an atmospheric vent for the bowl. I always make sure the vent passage is clear from the choke end, and from the throttle end. Takes 2 different size drill bits to clear the entire passage. .150" from the front; .180" from the rear. Most common cause of plugging is dirt by-passing the air cleaner. M.
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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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