Hello everybody,

some days ago I did a regular inspection on the bolts of my cilinder.

For my surprise, I found 2 totally un-torqued bolts and one that was broken. It happened just after my mechanic issued a rockerarm change (because I run out of oil) and a valve adjustment.

The broken bolt is 5 in this photo, and half of it is, of course, inside the hole:

http://images.cmsnl.com/img/partslists/suzuki-ls650-1994-pr-cylinder-head_big...

For reference and to help you locate the function of nē5:
http://i.imgur.com/hyVOc5d.jpg


What can happen with this broken bolt? Do I have to worry too much?

Of course, I killed the mechanic.

My 2 cents...I agree that it's a head cover bolt, however, the cover is also the top half of the cam journals so I'd guess it's good to have all the bolts in and be even. Having said that, the #5 bolt is not real close to the cam so my vote would be to keep an eye on it and watch for leakage in that area. I'll be interested to hear what others say.
I was using a cheap torque wrench from (guess what tool store) and I broke one of mine. they do snap off very easily. Luckily the motor was sitting on my bench so it didn't hurt quite so bad to take the cover off and start over. 

There is a torque range listed for about every nut,bolt and screw,but that doesn't mean you've gotta use a torque wrench. When you are working on things,small bolts into aluminum threads,you're ahead using a 1/4" ratchet, and when it starts to come up snug, put the thumb on the ratchet head and
Feel the bolt as you just use the little finger and ring finger. A stout fourth grade girl can strip these out. And which is better? Fixing a stripped thread, getting a busted bolt out or not getting something perfectly tight and having to go back and fix a leak?
The bolts aren't the highest quality, the castings are just aluminum,,

That rocker arm wear is not from running out of oil.....as the cam journals fail long before the cam lobes and rockers do when there is not enough oil flow (and the piston/cylinder fail even faster).  The wear on the cam and rockers is from using oil with too little ZDDP in the oil for an extended period of time.

You need to be using a motor oil with 1,200 - 1,400 ppm of ZDDP if you want the new rockers to survive.

What kind of motor oil have you been using?

We do not like oil made for modern bikes, not enough ZDDP.
this includes zuk oil.
And the problem with racing oil are lack of additives to clean and balance the oil.
can't speak about the castrol in particular.

If you're burning oil, check the top of the piston for deposits.  if there's a lot, then it might be time to replace your rings.

HovisPresley wrote on 06/02/15 at 08:50:54:


I was reading the Suzuki LS 650 Savage 86 to 04 Service Manual Clymer and there's a section that says:

CAUTION:
Do not add any friction-reducing additives to the oil as they will cause clutch slippage. Do not use an engine oil with graphite added. The use of graphite oil will void any applicable Suzuki warranty. It is not established at this time if graphite will build up on the clutch friction plates and cause clutch problems. Until further testing is done by the oil and motorcycle industries, do not use this type of oil.

What about this comment and ZDDP?