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Hello my name is ***** ***** will assist you with your question. So your correct model nr is J140TLCO. This stands for the following:
J - Johnson
140 - 140 HP
T - Trim and tilt Electric Strart
L - Long Shaft 20inch
CO - 1985
As for the parts, here is a link for the part catalogue of your engine:
And here is for the carb repair kit :
If you require further assistance do not hesitate to contact me back.
Ok it looks like blocked jets in the carbs. Ideally get a repair kit and get the carbs rebuilt. To do so, remove the carbs and open the bowls. Remove all rubber parts float and needle and soak in carb cleaner for a couple of hours. Then blow well with compressed air and reassemble the new kit. Replace everything back and it should be ok.