250-500cc Should really clean ya power valves

Whilst pulling apart my bro's 2K WR250 (love playing bike mechanic did l tell ya that :P ), to do a top end, thought l might check the PV action which l've always suspected that they are jamming up.
Pull the thing apart and F me, with amount of carbon on the PV as soon a started cleaning the PV mech's the whole jammed up.
2 hr's later and face that could be seen as a racial slur, managed to clean them up, lube the bloody thing and the whole action is smooth again:
BEFORE:


AFTER:


Question, how many out there pull apart the PV when doing a top end?

I did on my road bike (Yamaha TDR 250), does that count? Hoping I won't have to pull the top end on my 360 for a while (I just jinxed myself) but will surely service the PV's when I do.

Nah I jus clean mine every ride OMG. WFO 1-5th on way back to car for a few seconds!

Seriously mine are never carboned up more jus spoogy/oily(that sweet jet black oil). What oil ratio/jetting/riding style he doin? 32:1 castrol tts with 98 octane never a prob(touch wood)

Tell him to stop riding like a girly man n twist that right grip some more!

Mine were clean after many hours and didn't require disassembly, I believe because of Amsoil and good quality race fuel. On other bikes I have bought used or was fixing for friends I had to take them completely apart and clean them. Easy Off Oven Cleaner works great and so does soaking the parts in a bucket of carburetor cleaner.

I clean mine during top ends, but hear nothing but good things from amsoil.
May start importing it.

thats mostly jetting.....

True story, but the route fuel mix (pre and post combustion) make's it's way to the powervalves is through the venturi.
So yeah pv goop is jetting related me finks.

Yeah a lot of slow riding and the top end is about 120hrs old (118 to be exact), ratio's always been 50:1 but the last time l rode it, felt like the PV's weren't coming on and there was an air leak...see what happens when his pit crew buys a 4t .
Always wondered why he likes taking my 360 more than his 250...brothers

Cus the 360 is hard too beat, anywhere!

You 2 strokers and your finicky valve issues...

Unless your on an electric bike or peddle then you cant talk.

+1 on the easy off oven cleaner- was told that by a friend who has done it. Thanks Russell.
Agree- Amsoil seems to be clean stuff- I'm running Interceptor 40:1.

Have tried oven cleaner in the past but on this particular PV, wasn't game to leave it overnight as its got a nasty habit of eating away the surface...wirewheel and dremel so much easier!!

Carb cleaner, petrol old tooth brush
Or wire wheel its all good aslong as the pv gets some love.

I pulled my power-valve covers off today (on my new-to-me 07 wr250), lots of carbon...decided to pull the power-valve assembly and clean everything.
Right side did not want to rotate at all...Left side rotated partially.
Thanks to penetrating oil, I now have them rotating completely...but still can't pull them out.
I think I'll leave them in, and proceed with cleaning everything else.

Looks lean to me. Hot/dry/gray.