Knowing that these things are getting harder to find..is there precautions or prevention that can be done? Watching how much that thing vibrates while running is crazy...padding?

Mj
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'93 MC21 250sp Repsol "Doohan"

Just make sure your PV's are always adjusted and not gummed up with carbon. If you look after them the PGM shouldnt give you any trouble at all.
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If I have to take the carbs off once more...

10-4
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'93 MC21 250sp Repsol "Doohan"

Whats the best way to clean the power valves ?

Take the chambers off and spray some brake clean/carbie cleaner in there ?
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Winning isn't everything, but loosing isn't anything

Remove them completely and wire brush them.
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Andy.
NSR-WORLD.COM

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If you maintain them well though you dont need to remove the cylinders. You can simply pull the power valve shaft out while holding the valves in place with your fingers.

Clean and then replace. Make sure the piston is at TDC though otherwise they can fall into the cylinder
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If I have to take the carbs off once more...

I clean my powervalves on my RS every top end. You would be suprised how much carbon builds up on them so quickly.

I soak them in mineral spirits and then use a flat edge tool to scrape the carbon clean from the flapper valve. I then use some scotch brite to clean them up really good. making sure there is no carbon anywhere on the valve.

Generally the pocket in the exhaust port where the power valve sits doesnt get any build up in there so you don't need to worry that much about cleaning that up. But I do use scotch brite to clean up the entire exhaust port of any carbon build up.

if the power valve is jamming, or not closing all the way, this will put un-needed load on the servo, which will in turn overload the PGM and burn it out. So yes, your power valve operation and adjustment is very important.
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Charles Gallant