Topic: cb750 cylinder studs and main studs

[KRONUS0100]

have done some reading, but still got a question or 2.  are these new HD studs really that fragile that they are breaking in the head torque sequence?  and will the stock rubber dowel pins and acoompanying o rings go over these studs?  Getting ready to replace the old stock ones on my motor due to recent issues, and am even considering replacing the main bearing bolts with studs as well.  thanks.

[Terry in Australia]

I've built 2 engines with H/D cylinder studs (NOS RC studs on one engine and APE on another) and had no problems with either set. I torqued them down to around 25 ft lbs from memory, with no leaks. They'll work fine with your dowels etc. I'd certainly rather use them than the standard "stretchy spaghetti" OEM schidt studs. I haven't used the bottom case studs yet, but I plan to when I rebuild my engine soon. Cheers, Terry.

[KRONUS0100]

thanks Terry.  wound up with an oil leak on my 72 motor due to reusing the factory studs because money was tight.  doin it right this time round.  goin with a 2cd size over bore job...dont feel the need for an all out 850 kit.  will be using the webcam 41a camshaft, allready talked to dynoman performance about it.

[MCRider]

And I wonder, and its my position, that you don't have to crank all the way on the HD studs. Even though they may be good for 25+, why would you. Stock being 15-18 ft lbs, I think, being able to take them to max +10% in a consistent manner, knowing they won't stretch or distort is enough to accomplish the goal and minimize the chance of breaking.

I say go to 20ftlbs and it won't leak.

Maybe more if a turbo is involved?   

[Terry in Australia]

Yeah, I wouldn't be too leery about 25 ft lbs though Ron, the Ape studs are the same dia as the "Waisted" portion of the studs in my Suzuki GS1000, and the torque setting for them is 36 ft lbs. The Ape studs for my GS1000 can be torqued to 42 ft lbs! Cheers, Terry.  

[MCRider]

Yeah, I wouldn't be too leery about 25 ft lbs though Ron, the Ape studs are the same dia as the "Waisted" portion of the studs in my Suzuki GS1000, and the torque setting for them is 36 ft lbs. The Ape studs for my GS1000 can be torqued to 42 ft lbs! Cheers, Terry.

Yikes! didn't know that. A few here have broken the stud at a much lower torque, around 25ft lb. But that was probably an unfortunate fluke.

[Terry in Australia]

Yeah, I wouldn't be too leery about 25 ft lbs though Ron, the Ape studs are the same dia as the "Waisted" portion of the studs in my Suzuki GS1000, and the torque setting for them is 36 ft lbs. The Ape studs for my GS1000 can be torqued to 42 ft lbs! Cheers, Terry.

Yikes! didn't know that. A few here have broken the stud at a much lower torque, around 25ft lb. But that was probably an unfortunate fluke.

Yeah, I don't know who the guys involved were, or their level of experience Ron, but I torque my studs down in small increments, (and the studs are clean and lightly oiled, as are the nuts) and I haven't broken one yet. Cheers, Terry.