Topic: Do front corner cylinder studs stick more often?

[Grinnin]

The studs in 2 different engines have stuck studs at the right front corner.  One engine they all came easy with less than a day of penetrant (except the stuck stud).  The other engine they all needed 4 to 8 days of penetrant.

Looking around this site I find more pics of front corner studs stuck or broken off.  There are some pics of other studs, but they seem to be a minority.  Straight chance would have corner studs broken about 1/8 of the time and what I see is closer to 1/2.

Are front corner studs really more likely to be stuck or break off? Or do I have a simple sampling error?

If so, why?  (Ignorant guess: more cooling airflow means less heat cycling when the motorcycle was running??)

I'll get these studs out after taking the cases apart so I can heat the case evenly and cool the studs.  I started the thread as a place for science or speculation instead of yet another how-to.

[MCRider]

what model and year range?

[Grinnin]

One is a CB750 K5 mfd in Oct, 1974.  The other is slightly earlier but I don't recall the exact year.

This site has photos of other, non-750 engines with stuck/broken corner studs.

I just noticed another factor.  The corner studs are short as are the two front-center studs.  Those 4 studs are the only ones not protected by the valve cover.  The two front-center studs would be less exposed to rain than the corners where rain and corrosion could cause more stuck studs.  I don't know if this applies to the non-750 engines shown with stuck/broken studs.

[Garage_guy_chris]

These two? it seems moisture can get to these two somehow because i have disassembled 4 engines and in all 4 these were significantly more rusted. on my engine build engine both front ones broke off.  they both came out after welding nuts to the broken stud but still with much resistance....




look at the base of the stud in the bottom left corner of the photo