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Offline Dilbert

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Re: Source of engine mount screws.
« Reply #10 on: July 19, 2019, 10:50:02 AM »
Justin
what length bolt did you use, Heed is 90mm, Probolt only goes to 80mm that I can see ?
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Offline Paulhere

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Re: Source of engine mount screws.
« Reply #11 on: July 19, 2019, 12:57:21 PM »
Stainless steel reacts with aluminium which can cause the aluminium to corrode. Also galling can occur causing seizure of the bolt in the thread. Hence why manufacturers do not fit st/st into aluminium threads. Ok into steel threads as in fairing fasteners & other situations eg mudguards. Do it at your own risk, you might get away with it. I'd do as the manufacturers do, they generally know what they're doing.
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Offline healdem

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Re: Source of engine mount screws.
« Reply #12 on: July 19, 2019, 05:54:06 PM »
*Originally Posted by Paulhere [+]
... I'd do as the manufacturers do, they generally know what they're doing.

C'mon guys, what sort of advice is that to post on a bike forum...  :084:
'they generally know what they're doing.'

I mean next you will be saying read the instructions, let alone use the recommended oil.
Or use the recommended break in regime.

 :125:

Offline Paulhere

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Re: Source of engine mount screws.
« Reply #13 on: July 19, 2019, 06:30:32 PM »
*Originally Posted by healdem [+]
C'mon guys, what sort of advice is that to post on a bike forum...  :084:
'they generally know what they're doing.'

I mean next you will be saying read the instructions, let alone use the recommended oil.
Or use the recommended break in regime.

 :125:

Ha, just trying not to upset anybody. It's standard Engineering practice.

But you can refer to bike forums if you prefer.
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Offline cwadej

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Re: Source of engine mount screws.
« Reply #14 on: July 19, 2019, 09:27:11 PM »
Maybe that's why the factory puts a copper anti-seize on them?


*Originally Posted by Paulhere [+]
Stainless steel reacts with aluminium which can cause the aluminium to corrode. Also galling can occur causing seizure of the bolt in the thread. Hence why manufacturers do not fit st/st into aluminium threads. Ok into steel threads as in fairing fasteners & other situations eg mudguards. Do it at your own risk, you might get away with it. I'd do as the manufacturers do, they generally know what they're doing.

Offline tauzero

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Re: Source of engine mount screws.
« Reply #15 on: July 20, 2019, 12:45:23 AM »
*Originally Posted by Paulhere [+]
Stainless steel reacts with aluminium which can cause the aluminium to corrode. Also galling can occur causing seizure of the bolt in the thread. Hence why manufacturers do not fit st/st into aluminium threads. Ok into steel threads as in fairing fasteners & other situations eg mudguards. Do it at your own risk, you might get away with it. I'd do as the manufacturers do, they generally know what they're doing.

The manufacturers, of course, might be simply saving a little bit of money on every bolt, which adds up to a lot of money.

The oldest bike I have conveniently to hand with stainless steel fasteners is a Trident that I put s/s fasteners on - forks, swinging arm clamp bolts, handlebars, brake reservoir lids, and so on. That was 20+ years ago, no sign of issues. I'm 62 so at that rate any s/s fasteners I put on a bike now are unlikely to have any problems in my lifetime. Conversely, the reason I put s/s on was that the steel bolts had corroded in place and if they'd stayed in place much longer would have wrecked the threads  in the aluminium. So I'm sticking with stainless.
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Offline Paulhere

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Offline tauzero

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Re: Source of engine mount screws.
« Reply #17 on: July 20, 2019, 11:40:15 AM »
Haven't had any problem with galling. Have had plenty of problems with non-stainless fasteners rusting into place. Have you ever owned an old bike?
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Online Rtwo

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Re: Source of engine mount screws.
« Reply #18 on: July 20, 2019, 11:55:51 AM »
I'm generally happy using SS fasteners in aluminium alloys as long as copper grease or Loctite etc. is used

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Online Stevie.P

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Re: Source of engine mount screws.
« Reply #19 on: July 20, 2019, 12:03:35 PM »
*Originally Posted by tauzero [+]
The manufacturers, of course, might be simply saving a little bit of money on every bolt, which adds up to a lot of money.

The oldest bike I have conveniently to hand with stainless steel fasteners is a Trident that I put s/s fasteners on - forks, swinging arm clamp bolts, handlebars, brake reservoir lids, and so on. That was 20+ years ago, no sign of issues. . So I'm sticking with stainless.

:0461: I love using S/S whenever/wherever possible.  :017: :028:

All the threads, many cut straight in to the sandcast alloy engine casings, without inserts, were already 15yrs old before I renewed every fastener with S/S (and CopaSlip) in 94 and then and since also fitted any other item available in S/S to my Bonnie (cyl head studs/bolts, bars, mudguards, brake pistons, brake parts, rims & spokes, wheel spindles, etc, etc.). So now 40yrs since July 78 manufacture and 25yrs of S/S fitted and still not one solitary damaged or repaired thread on the bike .... my Tiger will be lucky to get to 5yrs old before the standard fasteners are causing issues to remove/refit.



There is even a specific (silver) CopaSlip for aluminium if that concerned .... but we only have the standard stuff in work  :164: and it has done me alright on alloy to S/S (or plain steel).
Also owned my 1979 Bonnie T140E from new!

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