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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #31  
Old 2 Weeks Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
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I don't think a 650 Trumpet is worth the price f a few helicoils.

I woulda just sold it for scrap.
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  #32  
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still ride one along w/sporty

https://ibb.co/4K4pYGG
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  #33  
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It's a shame they are such a pretty little engine. If they looked more like a Royal Enfield Crusader no one would ever buy one.

They are a bit like having a 1300 cc sports car. It's all fine until you drive a Corvette.
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  #34  
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Quote:
Originally Posted by Jeff View Post
Lots of good information here, lots of misinformation here. Fun fact: red loctite was designed to have the same viscosity of 20W-50 motor oil, so it can be used interchangeably when torquing "wet" fasteners. Some prefer the motor oil, some prefer the added (but false) peace of mind of the loctite.

It is extremely important to follow the manufacturer's recommendations when torquing any fastener. They, and only they, know if their specification is for a "wet" or a "dry" value. This is all over the map, to the point where it is foolish to say "all head bolts..." or "all rod bolts..." (and yes I know ours don't have them, just an example). Some manufacturers will state things like "unless otherwise specified..." and then never mention again wether their torque specs for a specific application are "wet" or "dry".

Many installations do, in fact, specify a stretch value for the fasteners rather than a torque value. This is actually a more accurate way to do this, discounting thread drag, washer drag, and that sort of thing. It is incorrect to say that once a fastener is torqued to its stretch value that it will not, when loosened, return to its relaxed length. In most applications, we endeavor to not exceed the elastic limit of the fastener, in which case most will return to their relaxed state when loosened and can be reused safely. Again, this is application, fastener, and material specific. The manufacturer knows - follow their recommendations.

There is no "one size fits all" or consistency to any of this. Specific applications simply vary too widely to say "you always...". The only thing "you always..." do is check the spec.
Thanks Jeff.

Sounds kinda like an Aircraft Tooling Engineer

I don't know much about these old beasts and appreciate some of the guys on here that do.

And I listen and learn.

I am an old metal butcher, and I learned a lot when I was young by keeping chuddup listening to the old guys before computers. And making mistakes

Been using loctite blue on the stuff that comes loose on my '81. Turn signals, seat mounting hardware-just body parts that don't get hot.
And I will be getting some nyloc fasteners
if I do any serious motor work now I know how to proceed.

Thanks guys
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Quote:
Originally Posted by Ferrous Head View Post
I don't think a 650 Trumpet is worth the price f a few helicoils.

I woulda just sold it for scrap.
It was an original 59 Bonneville...thats why owner wanted it done. If it a been a unit engine it woulda been junk
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  #36  
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Heh heh, yeah, guilty as charged, Steve. And yes, I freely admit to a more than liberal use of both blue and red Loctite, and nyloc fasteners. I use them all, as appropriate, in those applications that do not specify torque values or methods of achieving those values. Like you say, turn signals, seat mounting hardware, body parts, etc. The stuff that seems to periodically just fall off. I believe HD were a bit negligent with regards to these "ancillary" applications. They could have done better. At a cost, of course, which was no doubt a consideration. As far as the "serious" stuff, however, wherein the engineers developed applicable specs, I will always respect their recommendations. Beyond the obvious technical reasons for doing so, there is, after all, this kind of "brotherhood" thing among us. I write my specs, they write theirs.
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Jeff,

Cost.
Could also say a bit of "lazy engineering"

Still love the old beast
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  #38  
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i can still recall supermoderacer racer Will's signature..''blue loctite,put that sh**t on everything.''
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