quote Garry in Tampa:
Those idle cavity welsh plugs come with the tune up kit. I wonder why people are so reluctant to use them. . . 🙄
Well; I am not particularly reluctant to use them; but it has always seemed to me that if I can remove the slow-speed needle and spray carb cleaner through there…..and watch it spray through the three orifices in the carb throat….then that **usually** means that removing the welch plug will reveal a clean cavity. Not always though lol….
BTW….the very late model 9.5’s came with a plastic "filler" that went in behind the welch plug. Can anyone tell me why that was used? What function did it have and if it is an advantage….can the plug be used in the earlier motors? OMC #312909
