I am new here but I have been reading all the topics published so far and I am building a 2001 DS 650 and I am in dire need of the Torque specs for the internal and external head bolts can anyone in here help? Thanks

 

Welcome. I believe they are 24 ft-lbs for the outer 8mm bolts and 44 ft-lbs for the inner 10mm studs. Careful not to over torque the 8mm!

 

Thanks I am sure there will be others.

 

Those torque specs are correct, but I could have swore my stud bolts were 12mm and the outers were 10mm......

 

8mm and 10mm refers to the thread size not the socket size.

 

The socket size is 15mm and 10mm. The service manual says exactly what Scooby told you. For about $50 you can replace the OEM studs with hardened ones and buy brand new nuts. (talking about the 4 main hold downs)

44 ft lbs is huge! Most of the race shops I know don't torque that far because it isn't necessary........even on high compression. If the threads on the nuts have any stress, they will pop at about 40 lbs. I start with replacing the studs, once you do that you should never have to do that again. That is a one time purchase for insurance. I always keep some brand new nuts around and I never put the old ones back on. I torque the small bolts to 20 ft lbs and the main stays to 39 ft lbs. The allen bolts on the timing chain side I just tighten past snug a bit by feel.

This is all done with a Cometic multi-layer steel gasket. I follow the torque sequence religiously and this has always worked well for me.

Good luck!

 

thanks guys i got my parts and put it all back together, all together with the bike i have 800.00 in so i cant wait to ride. i appreciate the comments on here they all helped my greatly.