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I am pulling the engine soon from my 94 ss to repaint it. I am thinking of doing some other work while it is out. It has rusty head nuts (insert joke here). I am obviously going to do a valve adjust but should I pull the heads and replace the studs and nuts? The motor runs great and has less than 10K on it but those rusty nuts can't be good. And if I do pull the heads should I just do the whole top end while it's out or wait for a problem?
 

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I am pulling the engine soon from my 94 ss to repaint it. I am thinking of doing some other work while it is out. It has rusty head nuts (insert joke here). I am obviously going to do a valve adjust but should I pull the heads and replace the studs and nuts? The motor runs great and has less than 10K on it but those rusty nuts can't be good. And if I do pull the heads should I just do the whole top end while it's out or wait for a problem?
While being aware of "shipwright's disease", I'd just do the things that are known problems, like the studs. I don't have one of these bikes so I'm not aware of any other problems with them.
 

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I'd do a compression test and if it's ok, leave it alone. You could check the torque on the head nuts, but you could break a stud doing that, and if the compression's good, it's not leaking. The rings and valve guide seals should be ok at 10,000 miles.
Joe
 

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Yep, as has been said if it ain't broke don't fix. You don't want a head removal turning into a stud replacement exercise. Yep good advise check the compression and check the valve shim clearances and keep riding.

There is no need to stress about the 900SS engines, my bike clocked up 160,000km's before I rebuilt it (due to a wrong diagnosis of a gearbox problem by my dealer it didn't need to come apart we established after it was disassembled). Just keep good oil in them, and most importantly ride them regularly!
 

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FYI, today I brought my '93 in to my suspension guy's shop for him to set it up for me. While it was on the lift I noticed some oil pooling behind the vertical cylinder head, which wasn't there an hour earlier. I know this beause we discussed the crankcase breather filter on the bike oil misting, and looking right at this area. Sure enough, one of the vertical cylinder head studs had snapped and was sitting there loose and I could just lift it straight up from the head.

It's not the end of the world, as I've got other bikes to ride (and I'm getting a new Multistrada S next week!) and I'm in the process of restoring the Marvic superlight wheels I just got for the bike anyway. It's a grand I'd rather not have to spend, but maybe just a good excuse for high-compression pistons :)

If you've got the engine out of the bike anyway, and your bike obviously has the original head studs, I would go ahead and change them. I was lucky I noticed it at the shop and not 200 miles from home, and to me it's worth the peace of mind. I think it's not a question of if your going to have this problem, but when, and if the motor is out it's a much easier job and cheaper than doing it later. If you don't ride the bike hard or don't plan on keeping it forever then maybe it's not worth it. The other advantage is that if you're doing it proactively you're not going to have to worry about the stud possibly being broken off in the block, and you've probably got a job that isn't nearly as messy.
 
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