Yamaha TRX850 Enthusiasts Forum

Hi All, Newbie here.
I am in the process of refreshing/rebuilding my TRX which I bought last year as a project. However when putting the engine back into it's freshly powder coated frame I managed to snap the top rear engine mounting bolt . I didn't get anywhere near the torque setting before the thread stretched and then the bolt snapped on the thread.
My question is - Have any of you used stainless steel replacements if so where did you get them from and how much? I can get some OEM replacements from a dealer but was wondering if any of you had used anything better? I intend to replace both the top and bottom rear mounting bolts.
Kev.

My choice would be an OEM bolt from Yamaha or find one at a wreckers.

Stainless would not be the bolt of choice there Vec, it will work harden and snap.
See if you cannot find a plated one from somewhere and double check your torque wrench

Thanks for the advice guys. Guess I'll order the OEM ones from yamaha.

Follow the torque specs too from the manual.
.. it can be downloaded online from here..

Are they different from those in the Haynes manual?

No, they should be the same...

Hi Vek,
A couple of years ago I did tear away the thread on the lower bolt of the rear shock absorber of my TRX, and I was not using really a lot of force.
Just a couple of months ago I did snap the bolt of the rear brake of the CBR (while removing it!) in a way similar to what happened to you: it stretched first (diameter of the thread in the stretched area was 7.30mm vs 7.80mm elsewhere) and then snapped.

In the latter case I did a mistake I will avoid in the future: I did not use Svitol before force application.

I discussed with a friend that is into metalworking and in his opinion the bolt had the risk of snapping during normal use anyway.
He's kind of an extremist: in his opinion after so many years (20)and miles (50k+) nuts and bolts should all be replaced with new ones for safety reasons because we don't see with the eye the metal fatigue, but is there nonetheless.