hey guys so right now I'm rebuilding a 2002 rm250 and one of the most
time-consuming things with rebuilding an engine especially a two-stroke engine
with an exhaust valve is getting all of the carbon buildup off the parts so
today I'm going to show you how I go about getting all that crap off so here
we have all the exhaust valve parts from the rm250 stuff is pretty gummed up I've
seen worse though but either way the method I'm using should rip all this off
without doing too much scrubbing so first thing you want to separate the
aluminum parts from the steel the aluminum will kind of get damaged if you
use some of these methods that piece is aluminum as well we're going to separate
this two for the steel we can use stuff that's pretty aggressive but for the
aluminum we don't want to damage it so we're gonna use something else you can
check these parts of the magnet to make sure they are steel or aluminum that one
is aluminum and that one is steel and I've already got the cylinder off the
spike all cleaned up you can see how well all that carbon came off of there
inside the exhaust valve areas just absolutely spotless now one thing I will
say before I get going is if you have access to a vapor blaster that's gonna
work the absolute best for getting all this crap off now like many of you I
don't have one at my disposal they're pretty expensive so I'm gonna
show you guys how we can clean up the stuff without having expensive equipment
now for the steel parts we're gonna drop them into a pan and then place the pan
into an oven now obviously you don't want this to be an oven that you're
gonna be using later on for cooking so drop the parts in there for about a half
hour to heat them up
alright the parts should be up to temp by now now we're gonna want to bring
these parts outside or in a well-ventilated area and then we're
gonna hose them down while they're still hot with oven cleaner
you can see some of that carbon is already starting to melt off there so
I'm gonna leave the cleaner on there until the parts are completely cool to
the touch now I'm just gonna spray the parts down with some degreaser to get
all of the rest of that off now after the first round I would say about 90% of
the carbon is off the parts still a little bit left in areas especially
inside of there now if you don't want to do any scrubbing or scraping you can do
a second round and it'll pull the rest of that carbon off so that's what we're
gonna do now now after a second trip to the oven this
stuff came out spotless not one speck of carbon left over so this oven cleaner
really did the trick he was only like dollar at the dollar store imagine that
but yeah a cheap way to clean up your parts now it's time to clean up the
aluminum parts we can't use the oven cleaner on this stuff this cleaner is
pretty caustic it'll actually eat away the aluminum so we're gonna use
something a little different we have a couple different options for cleaning up
these parts the first being this simple green degreaser from Home Depot I've had
some luck with that but what works even better is mag wheel cleaner that's what
I've got in this bucket here I don't have a ball to show you guys it's
actually pretty similar to this stuff here but I ended up buying a bunch of
bottles and just dumped them into a bucket so I'm gonna soak these parts in
the magwell cleaner if you don't have a bucket of it like I have just spray the
parts down let them soak for a while and come back and it should be eaten up
pretty good alright let's see how this stuff is coming along I got a feeling
we're gonna have to do some scrubbing unlike the oven method where it just
wiped right off but see we can do
looks like a good amount of this carbon came off here still quite a bit inside
just cover all right so that magwell cleaner is working but not quite as well
as I would have hoped and I hate to sit in your scrub in every little part for
hours so I'm gonna try something different all right now what I've got
here is some water with a little bit of that simple green degreaser at a rolling
boil it seems like heat is what helps loosen up this carbon now obviously if
you're gonna put anything at a boil like this especially a degreaser you want to
make a hundred percent sure that is not flammable
so let's give this stuff a shot it's been about a half hour let's take a peek
at the stuff looking pretty good wow that's a huge difference this cover was
really nasty before yeah the heat seems to have done the trick once again now
this batch turned out really good all the carbon basically just wiped right
off didn't take too much scrubbing stuff is pretty much spotless now this whole
thing was kind of an experiment in itself so if I were to do it again I
would probably grab everything steel and aluminum drop it into the pot on the
stove let that thing boil with some simple green degreaser and that would
pretty much just rip it all off and come to think of it you could probably do
some really heavy-duty degreasing if you wanted to drop a crankcase or a cylinder
clutch cover even like a transmission into a pot with some of that degreaser
get it up to a boil and it'll rip everything right off now if you're
wanting to clean the carbon out of an exhaust pipe like an expansion chamber I
would spray the oven cleaner at both ends of the pipe let it soak kind of
shake it around hose it out you could maybe even drop it in the oven or apply
some heat to it he always seems the help now at this point the parts are pretty
good everything is basically spotless and carbon free but there is another
level we can go with this stuff let me show ya
after a quick buff got this stuff looking really good almost better than
new now on the actual valve itself there's a pretty good sized Nick in the
face here I was able to smooth that out with the buffing pads now obviously I
didn't want to go ahead and burn off all the coating on this valve so just
hitting the face was fine but the rest of these parts that looked absolutely
awesome especially the aluminum covers looking fricking sweet now why didn't I
just use the buffing pads right from the get-go on some of these parts it's
pretty tight to get in there and the pads we want to be able to get all that
carbon off and also I didn't want to buff on them too much
just in case the pads kind of distorted the metal or wore away the surface but
just a quick buff was plenty enough to get them looking good now if you guys
would like to pick up those buffing pads they use throughout the video or the
simple green degreaser I will have both link down below the video in the
description thank you so much for watching the video guys hope this one
helped out and I will see you next time
you