Inspect your nuts!

[RODeo]

Just my 2p..........
 Ive used mostly nyloc nuts on the trike ,all new stainless steel. For some reason I used the correct imperial thread,but ordinary nuts ,not nyloc,(possibly cos they were out of stock when I ordered all my bolts)on the propshaft.I checked all the bolts for tightness after the first run out,but these are coming loose again ,even though they have the correct washer on them.Im putting this down to the vibration caused by the hadtail effect. Due to the prop being sort of buried under the seat and other stuff making it inaccesible(sp?),its an area which could be overlooked with dire consequences! So make sure all nuts are nyloc and arent able to loosen off.

[mouse]

i use thread lock mate
http://www.ebay.co.uk/itm/230742472982?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

[Manky Monkey]

I assume you're using a spring washer under the nut Rod? (made of sprung steel, it holds the nut in tension against the thread so it doesn't come loose). Nylocs work just as well, but obviously not in any situation where they're likely to get warm, (Nyloc- nylon insert in a normal nut. The bolt cuts a thread into the nylon as you tighten it, locking it against the bolt)
I haven't had a hardtail on the road for a couple of years now, but the regular Sunday morning maintenance check was part of the fun of riding & gave me something to tinker with after the initial build was finished.
If you're really worried, you could go the old fashioned racing route & wire lock the nuts. Tighten them up, then use a small drill to drill right through the side of the nut, bolt & out the other side. Thread a length of wire through & twist the ends together. Check the race/kitcar suppliers, such as Merlin Motorsport & you'll see they sell reels of wire & special lock wire pliers for the job. On a purely cosmetic front, lock wires can give a very retro race look to vintage vehicles too.   

[RODeo]

Yeah thread lock is one way to go,but I have occasionaly had probs with that over the years.

[snafu]

this site covers all aspects of nuts, bolts, washers, well woth a look

http://www.boltscience.com/pages/info.htm?

[RODeo]

Interesting info,will have aread of that later,thanks

[fifer]

I have inspected mine for hairline cracks 
.
.

[RODeo]

Must be the cold weather up there!

[BikerGran]

Mine's a softail but I once got to a rally and found I had LOST one of the bolts from the flange that joins the two parts of the propshaft - and the others weren't very tight!  Threadlock has dealt with the problem though I do still check now and then....

[spanners]

 found two pairs of ,,nutcrackers ,,,,,     today

[Bus Boy]

be carefull useing threadlock in areas where ya wouldn't use nylocs.....i.e. high temperature areas , cos the recomended way of undoing fasteners which have been threadlocked is to heat them up to break the bond! so be aware!

[Bus Boy]

this may be of interest...........all metal locking nuts

http://www.conceptfasteners.com.au/Products/ThreadLocking/Assets/Documents/Profile2-BX.pdf

have used them quite a bit at work......good in hot areas where nylon lock washers would met and threadlock may give up. another advantage is that they aren't very tall so should be good for limited space areas such as prop uj's!

[spanners]

bus-boy = nuts are we talkin 10 stud and  -badk -to-slack ,,