Broken Motor Mount

[mikeh]

Hi All i was cleaning my bike yesterday an 07 300 gg and noticed that my upper links from the frame to the head on my bike were both broken has anybody expericanced this before? is there another problem i should be looking into? Any help would be greatly appericated..

[stainlesscycle]

that sounds strange - both were broken? i would think the head would break first - is your frame tweaked from a big hit? or does your motor vibrate alot??

[wasp4banger]

Had exactly this problem on my 06 EC300. First thing to check is that all of the other engine mounts are secure and the bolts are tight.
I released all of mine to see how well the motor sat in the frame, if you have more than say .2mm or 8 thou of an inch gap between the motor and the frame, then get this gap shimmed to within this tolerance, otherwise trying to pinch the motor into the frame will distort the frame in induce stress.

The aluminium mounts are likely to fail first as aluminium is far more prone to work hardening.

Vibration may be a part of the cause also, do you get a lot of vibration up through the bars? I had my flywheel balanced up, which helped with the vibes a lot.

[mikeh]

Thanks for the replies, yes both were broke i have checked the motor mounts and the swingarm mounts as well they were tight. I do have a bit of viberation but not more than usual. I think were i went wrong is i don't ride track but did so this last week due to an enduro being cancelled. i think with my settings were to soft and i was hitting pretty hard so maybe that is why..

[nato]

So what was the outcome mate. My 10 300 has the same thing!