NX250 bolt broken on the engine - exhaust pipe

[scrambler]

Yes, the new Triumphs are metric like our Hondas. The thread of the brass nuts is M8x1.25 like the stud bolts

[hhgfnx]

Thanks scrambler for great advices!

[hhgfnx]

I have been looking for new stud bolts, as I only got one that is still ok. Seems originals are nowhere to be found, does anyone happen to know if there are some non-OEM equivalent available somewhere, or do I just need to make one myself from threaded bar?

[scrambler]

I have been looking for new stud bolts, as I only got one that is still ok. Seems originals are nowhere to be found, does anyone happen to know if there are some non-OEM equivalent available somewhere, or do I just need to make one myself from threaded bar?

Stud bolts M8x1.25 are standard and come in many variants (some reading viewtopic.php?p=15578#p15578 ).



I would take high-strength ones that are copper-plated. I didn't find it in 41mm length, but in 40 or 44mm https://www.ebay.de/itm/154938751744?ha ... R7jAtr37Yg. But you should still use ceramic paste http://nx650.nx250.de/albums/userpics/1 ... olzen2.jpg.

NX250 high-strength copper stud bolts.jpg

[hhgfnx]

If I haven’t said this forum is golden I’m saying that now.. thanks!

If buying those Triumph capped brass bolts, which of these two lengths would be better? Will 44mm be too long?

With open ended nuts it doesn’t matter I guess.

[scrambler]

Since the brass nuts are a few mm longer, this should work with the 44mm stud bolts. But no guarantee, not tried yet

[hhgfnx]

Ok, 40mm on safe side then perhaps

Someone asked me if I considered the electrochemical pair if installing brass nuts, and copper bolts. Well, no I didn’t! Aluminum is even “lower” that steel isn’t it, but still the aluminum block is not corroding away usually. But not sure what to think of it.

I would have thought that anything to do with bolts and nuts would be dead simple! Don’t feel that currently.

[scrambler]

I would have thought that anything to do with bolts and nuts would be dead simple! Don’t feel that currently.

Since a ripped of bolt causes quite a bit of trouble viewtopic.php?p=29285#p29285 , it's worth giving it a little thought. The copper bolts come from automobile manufacturing, so I think that's ok. The ceramic paste prevents salt water from penetrating, so not much can happen. You can also use zinc plated bolts, with at least strength 8.8.

Interesting fun fact - the stainless steel manifolds of the AX1 have a neck made of normal steel. Probably because stainless steel also has a corrosive effect on aluminum. By the way, the original manifold gasket is also made of copper https://www.cmsnl.com/honda-nx250-domin ... 291254000/

[hhgfnx]

Yes, me fighting one week with that broken bolt made me think this carefully

But as you say probably applying paste already saves from much trouble, no matter what material the bolt is. I'll get few stainless steel ones that probably are of right size, but I might still buy couple made of normal steel or copper, and use those.