SOHC.co.uk Forums > CB750

Over torqued?

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Trigger:
The center bolts on the cam towers strip for fun and i always helicoil as standard. You have to be careful as some of the cam tower bolts are longer than the others. If you put them in the wrong hole then, they will punch out the bottom of the threaded holes and the head will leak oil.  ;)

6 ftlb is ok for these M6 bolts and make sure the towers go on without the rockers in as, this puts pressure on the threads .

One thing i have noticed from your picture is : I thought you were rebuilding a K3 ? The head in the picture is late K1/ K2 head.

Johnny4428:
Thanks Trigger yes was centre tower bolts that stripped. I knew it wasn’t the correct head because of the standard dowels/knock pins were too long. Interesting that it is a K1/K2 although it is a K3 as far as I know the plate is stamped late 72. I thought the head might have been a later k4 - K6. Yes I did notice that there was two different lengths of bolts in towers. Thanks for help!

ST1100:
I'd go with Time-Sert, a tad pricey but more reliable...

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