Stainless Steel Exhaust Studs.

[Megadan]

I figured I could share this one with you guys since I know there has been a couple of recent exhaust stud failures.

For starters, the exhaust stud thread size and pitch for the CG250 is M8 x 1.25

Second, I found some nice stainless steel studs with flanged nuts from an ebay seller that have a hex drive on the end in grade A2-70 (304 high tensile cold worked). This will be much stronger than mild steel, especially at high temps like on an exhaust system.

https://www.ebay.com/itm/Stainless-Steel-Exhaust-Manifold-Header-Stud-Kits-Metric-M8-x-1-25mm-A2-70/232494547577?ssPageName=STRK%3AMEBIDX%3AIT&var=531805757483&_trksid=p2057872.m2749.l2649

You can't buy two, either 1 3,4 etc. Which is kind of annoying. I went ahead and ordered 4 and will stash the other 2 away as backups.

These are the 40mm studs installed on my ported head, seated fully in the cylinder head. They are very nice quality pieces. The threads are smooth and consistent.

https://scontent-dfw5-2.xx.fbcdn.net/v/t1.0-9/35166829_10156383900751992_1863552963608313856_n.j pg?_nc_cat=0&oh=b96a48cf9ec5e92a19eb7a37184c96f7&oe=5BB2906D

[JerryHawk250]

Nice!:tup:

[blanc12]

I am about to put the new exhaust on. I will be updating my studs with these when I do it.
Thanks Dan

[Weldangrind]

What do you recommend to prevent galvanic corrosion?

[Megadan]

What do you recommend to prevent galvanic corrosion?

The same thing that has been used for years. Anti-sieze.

If you order 4 studs they actually toss in a little single use tube of Loctite C5-A copper anti-seize with the studs.

In any case, even generic anti-seize compound has never failed me, and I have run stainless steel studs in all of my bikes.

One very nice feature of these studs is the 4mm hex drive on the front. It's cut pretty deep into the nose of the stud, so it should aid in removing the studs if necessary. Plus, being grade A2-70, it means the studs are a 304 grade stainless, so they will not weaken from constant thermal cycling anywhere near as bad as mild steel studs.