Briggs and stratton thread type

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Briggs and stratton thread type

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  • #2463
    Hacksaw
    Participant
      @hacksaw
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      #261029
      Hacksaw
      Participant
        @hacksaw

        Misplaced threads end up here ….so I'll start here then !

        I've got a Briggs mower engine needing a new exhaust . Only I'm fitting a non standard one, and need short flanged bolts . Bolt thread is referred to in American youtubes on Briggs as "1/4 – 20 " . Is it just UNC ?

        #261035
        Brian Wood
        Participant
          @brianwood45127

          Hello Hacksaw,

          ​I think that would be the size. All the US threads are 60 degree form, many have the same pitch as British threads of the same series, ie UNC being similar to Whitworth in pitch count..

          Regards
          Brian

          #261054
          Neil Wyatt
          Moderator
            @neilwyatt

            Gratuitously moved to a more appropriate topic devil

            Neil

            #261060
            Hacksaw
            Participant
              @hacksaw

              Bah, couldn't find any unc so I've hammered a Whitworth in it smiley 20ftlb will hold it….

              #261247
              Ian S C
              Participant
                @iansc

                Should be OK.

                Ian S C

                #261252
                Jeff Dayman
                Participant
                  @jeffdayman43397

                  Mufflers are for sissys! if it falls off again leave it. wink 2

                  #261271
                  Howard Lewis
                  Participant
                    @howardlewis46836

                    Many years ago, out Chief engineer would not countenance anything but BSW or BSF, so we had to run a BSW tap into a UNC hole so that we could use BSW bolts and setscrews.

                    IIRC, UNC will screw into BSW fairly happily, but not the other way round, so it might be worth just cleaning out the tapped hole with a 1/4 BSW tap.

                    Howard

                    #261272
                    Michael Gilligan
                    Participant
                      @michaelgilligan61133

                      It's worth mentioning [for the umpteenth time] that a lot depends on the class of the threads.

                      The ubiquitous 1/4" screw thread for camera fitment to tripods was specified as 1/4" Whitworth, but is now 1/4" 20 UNC, to a sufficiently slack tolerance that old & new are deemed compatible.

                      MichaelG.

                      .

                      Ref. ISO 1222

                      Edited By Michael Gilligan on 15/10/2016 18:22:58

                      #261365
                      Ian S C
                      Participant
                        @iansc

                        UNC and Whitworth are the same pitch for all except 1/2", UNC 13 tpi, BSW 12 tpi. With ordinary off the shelf bolts they are fairly interchangable.

                        Ian S C

                        #262434
                        dean clarke 2
                        Participant
                          @deanclarke2

                          LOL 😁 ​I have to agree with Jeff mufflers are for pussys, leave it off next time and put a trumpet pipe on. Haha cheers Dean

                          #262444
                          Jeff Dayman
                          Participant
                            @jeffdayman43397

                            While he's at it Dean he could retard timing a bit on it and get some spectacular gunshot-like backfires.

                            That sort of thing plus mowing at 700 am will satisfy anyone's need to p^ss off their neighbours.

                            (just kidding, hope the OP got their bolts sorted out.)

                            #262464
                            Hacksaw
                            Participant
                              @hacksaw

                              Op did get the mower going quietly !cheeky However , had to look at the fella's bigger ride on that had lost power ..Turning it over by hand , it produced a loud whistle over compression . Fitted a new head gasket , squeaky noise has vanished ,goody goody top banana !! Went to start it with a new battery , but it wouldn't rev up much above idle?? Sounded more meaty ,but not much increase in rpm's..?? It drove though albeit slowly ..

                              Engine is an Intek 16.5hp Briggs .Further investigation reveals the cams have worn so much .the valves only open about an eighth of an inch!! Seems a common issue ,avoid B&S Inteks .. Looking for a big Hondasmiley

                              #262719
                              Jeff Dayman
                              Participant
                                @jeffdayman43397

                                Honda engine would be a big improvement over a B&S Intek. The early Briggs stuff was great and generally very durable and resistant to abuse. The later stuff is pretty iffy – cams made of cheese, crappy electronic ignitions etc – a shadow of its' former self. In the last few years many parts on Briggs engines, if not the complete engine, seem to be made in the far East. In my neighbourhood I fix lots of outdoor equipment on a casual basis. On later model Briggs mower engines I'm seeing weird failures of parts that NEVER failed on early Briggs engines, ie heads with cracks between bosses, split flywheels, broken cams (some cams with the gear and cam are plastic moulded onto a steel rod) and oil slinger gear wheel failures causing jam-up seizures.

                                Yep, Honda are looking good….JD

                                #262733
                                Hacksaw
                                Participant
                                  @hacksaw

                                  I can never fathom out why a G , GX or GXV Honda always seems to fire up first pull, even if it's been stood for months … and the pulley the recoil cord is attatched to , seems a mile to big ,like you have 2 ft of string for about 1 rpm, whereas a briggs might have gone through 2 compressions for the same pull !

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