Single use bolts/washers/etc on this bike?

[SneakyDingo]

Something @dmonkey mentioned

Per Honda's service manual, these are single-use bolts and to be replaced each time they are removed.

Got me thinking: is there a list of the single use items for this bike? So I could do something like get that list, find where it's used, and then generate a second list of maintenance items where I need to be aware that I should replace something rather than reuse it? For example, brake pad replacement, oil changes.

 

[dmonkey]

In the Service Manual, torque values start on page 1-12. If you go through the few pages of torque specs you will see "Pre-coated (ALOC) bolt, replace with a new one." called out in the REMARKS column for some fasteners, which are the single use ones rather than it saying "Apply locking agent." for reuse.

There are also a few cotter pins used in various places such as the rear master cylinder assembly, brake linkage, footpeg pivots, and center stand. Best practice would be to consider those single use since bending weakens them, but if they're carefully removed they can be reused in a pinch. Very inexpensive to replace, and you can likely match them by eye to something at your local hardware store if you don't want to order and wait on OEM Honda parts.

 

[Cpd419]

I’ve re used crush washer on vehicles for years without a problem knock on wood. I inspect them first though.

 

[m in sc]

theres no shear failure worries, id stuff blue loctite on it and reuse it. Not about being cheap, but realistic. there's no need for new hardware every time, that's a CYA for the dealerships protocol, probably because at some time in the past i'd bet a tech didn't tighten one on another bike & they made a sweeping engineering change order.

as far as crush washers, i swap them out with stat o seals.

 

[dmonkey]

That makes sense. Same as brake hardware on other bikes and cars being "single use" in service manuals, it would mitigate the risk (and their liability) of someone forgetting to re-apply the thread lock.
A benefit to using a new bolt is that the torque spec provided is for that replacement ALOC bolt with thread locker pre-applied. Liquid thread lockers often include lubricants (yes, really, lubricants in an adhesive) which can result in a overtightening if not taken into account.

 

[m in sc]

id never even bother checking toque on a slider pin. tight, good to go. next.

 

[dmonkey]

id never even bother checking toque on a slider pin. tight, good to go. next.

The slider pin / hangar pin isn't one with thread lock applied, so not an issue.

 

[m in sc]

other bikes, do, and they are considered one use as well. but r clips, etc, pfft, they are fine as long as they aren't mangled. hell i have soem bikes with original r clips that havent ever been changed that are 50 years + old and have been off a bunch.

the -only- (vehicle) hardware i would ever consider truly 'one use' is the stretch head bolts some vehicles use. that's it. I have never, in 35 years of wrenching, ever seen the actual use for it anywhere else except where it self destructs on removal, like staked screws in a throttle butterfly, etc, an thats across cars and bikes.

 

[dmonkey]

R clips or hairpins are certainly reusable. There are some cotter pins used on the CT125 that are split bent and not very malleable, bend them back and forth just a few times without heat and they'll break.
You're probably right that there aren't any single use "yield" bolts on the CT125 that remain permanently stretched after use. For the low cost I'd buy the replacement ALOC bolts just to have peace of mind not overtightening anything using the provided torque specs. The torque skew can be up to around 20% which is significant, I sure wouldn't intentionally torque something to 120% of what the manufacturer says, since the whole reason I use a torque wrench is to not have something be too loose, nor have it be so tight that something breaks.

Stretch bolts (silly name since all bolts stretch) or torque-to-yield fasteners that are permanently elongated after use, are commonly used to secure con rods in liter bikes, and they're all over in cars and trucks. Not just on heads and con rods there, but main bearing caps, drive shafts, body mounts, ball joints, tie rods, steering knuckles, etc. Those fasteners aren't exclusively torque-to-yield, just some uses where they often are. Having built motors, you're probably more than familiar with aftermarket reusable replacements (not torque-to-yield) from ARP, Fel-Pro, etc that are often installed to a low torque spec, then finally tightened to a torque angle.

 

[m in sc]

I actually used to run the NA division of desoutter tools service division (division of cp under atlas copco), one of my employees was sent to Kazakhstan to oversee the implementation of training for GE powertrain division contractors.. we actually had to develop the protocols for yield testing and service application for locomotive use diesel rods....long story short, yeah, im aware of the applications probably more than most. 'stretch bolts', in particular as i referred to them, do NOT have the ability to return to shape as some of the others do. the 1st time i ever saw this was when i was working for honda MANY years ago at a (car) dealership.
ARP rod & head-bolts, like i have in my big block ford, are absolutely reusable. Most hardware used in these applications will have max and min lengths dictated to when they need to be replaced. the general 'cover your ass' replace every time protocol is usually BS except in very specific and high performance applications, and that's just a fact. Hell, to be technically correct, nylocks shouldn't be used more than once either.... lol.

 

[SneakyDingo]

Admittedly I haven't serviced all of the bike yet, but where it's convenient I generally try to swap new hardware in if it's suggested. Does it cost a few extra dollars? Yeah, but that's not a concern I'm majorly worried about. I won't stress over it if I have to reuse the thing, but I'll use such notes to add it to my next Revzilla order or stick a note under my seat so the next time I'm near a Honda dealership I can ask them for parts.

The other problem is I live somewhat close to the ocean in a wet area, and corrosion is an issue I have to contend with. So swapping out bolts, pins, etc. isn't a terrible idea from that perspective.