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  • Broken engine mount thread

    My friend's bike has always felt really weird to ride and vibrates like crazy. He bought the bike close to six months ago but only recently discovered why the bike felt weird and was because of a missing engine mounting bolt on the right side of the bike. Not only that, but the thread where the bolt went into was half missing!

    http://www.amnet.net.au/~amunday/bike/munted.jpg

    Is there any way to fix this without replacing the engine block? Are there any weld's strong enough to hold this type of thing? I reckon it'll be an expensive fix either way, but if there's a weld strong enough then it would be the cheaper option and least amount of work.

    Any input appreciated..
    PSB Roller - http://soundcloud.com/talon

  • #2
    Not going to be a cheap fix, engine out, build up the missing piece then drill and tap a new thread in.
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    • #3
      We'll probably try removing the engine ourselves to save the labour costs and bring it to an engineering shop to sort out the weld. So a weld is definitely going to be strong enough then?
      PSB Roller - http://soundcloud.com/talon

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      • #4
        Looks to be a common problem after a crash:

        http://www.cbr250.com/cbr250/forum/t...TOPIC_ID=47252

        PSB Roller - http://soundcloud.com/talon

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        • #5
          the old half thread. good for saving weight, but not so good at holding shit together

          sounds like you should be able to get out of it pretty lightly going on what the bloke on the cbr250 said
          Respect is earned, not enforced.

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          • #6
            Yeah luckily won't have to remove the head like he did. Removing the engine though, something I've never done before but keen to give it a try.
            PSB Roller - http://soundcloud.com/talon

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            • #7
              So would it be correct to say that the thread doesn't deliver?



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              • #8
                It will in good time. Just chill..
                PSB Roller - http://soundcloud.com/talon

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                • #9
                  A weld, done properly will be as strong as the origional. When you say half the thread is missing, does that mean its stripped out of the hole or there is a part actually broken off? if its just stripped out, and there is enough metal around it, you could drill it out and put a heli coil in, that will be more than enough to take the torque needed on an engine mount bolt.

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                  • #10
                    Do you really need to remove the motor?

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                    • #11
                      The thread is actually broken off like in the photo.

                      I'm pretty sure the engine needs removing as there's not much room room to play with. Above is a radiator hose and that viewing window is too small to do work like this you'd think? Maybe get the engineer to check it out before hand.
                      PSB Roller - http://soundcloud.com/talon

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                      • #12
                        Originally posted by Desmogod View Post
                        Do you really need to remove the motor?
                        you thinking just weld the engine straight to the frame?
                        Respect is earned, not enforced.

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                        • #13
                          Originally posted by Desmogod View Post
                          Do you really need to remove the motor?

                          lol, tard (10char)
                          If cleanliness is next to godliness, why was jesus a dirty sandal-wearing beardo?

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                          • #14
                            Errr, why am I a tard?
                            Weld it up, shape it with a dremel, drill and tap.
                            Tards lose springs from carbies, not make suggestions.

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                            • #15
                              If the engine can be lowered from the frame enough to do the job, then that'd be great. But otherwise, it'll have to be removed. But yeah, we'll see what the engineer says.
                              PSB Roller - http://soundcloud.com/talon

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