- Hey guys, this is Justin with Rocky Mountain ATV/MC
and I wanna show you the Tusk Crankcase Splitter.
Alright, so if you need to get
to the bottom end of your motorcycle,
whether you're messing with your crank,
or you've got a gear that's gone out in your transmission,
if you've gotta split the cases,
you've gotta have a case splitter.
And this Tusk Case Splitter is gonna work on
all your two-stroke and four-stroke engines.
And it works really easy, I wanna show you how to use it
and give you a couple tips on using it.
So, the tool is really easy to use.
Pretty much, these three ears of the tool are adjustable.
They're going to mount to your crankcase
and then, this center bolt
is going to press against your crank
and you're going to pull the case off the crank,
is essentially how this thing works.
Now, I wanna point out a couple things when using this tool.
First of all, the steel used on this tool is extremely hard.
You don't want the steel to flex
and you know, throw this bolt off
and push on your crank funny,
so that's why this material is really hard.
With that said, there's not gonna be a lot
of give to this material,
so if you misuse it, you could actually break it
or damage your motorcycle
and you don't wanna be doing that.
So, let me show you how to use this.
It's really simple,
you're gonna set the tool over your crank.
I'm gonna loosen the bolt up a little bit
because I want the ears of this tool
to fit either flush on my case
or as close as possible.
No matter what you do,
you want the ears parallel to the case
because you want the bolt on this tool
to be pushing on the crank straight,
you don't want it to be pushing crooked or anything.
So, I'm gonna set this tool on
and I'm going to pick three mounting holes.
In this case, this is a YZ250,
I'm going to use three of the holes
that hold the flywheel cover on
and I want to space those out
as evenly as I can.
These three holes seem to work pretty good,
and I'm going to put my bolt in.
Now, this tool comes with two sets of bolts.
One's a six millimeter set
and the other one's an eight millimeter set.
And so, it just depends on what your bike has
and which holes are most accessible.
This one's all six millimeter,
so I'm going to install the six millimeter bolts in each ear
and I wanna thread these in as far as I can.
You wanna grab as much of the case threads as you can.
Now, you'll notice, these are really long bolts.
That's just to make the tool more adjustable
for different applications.
I'm gonna thread this in as far as I can
and then I'm going to put the nut,
thread the nut down on top of the little ears here.
So with the bolts in,
and the tool centered over my crank,
I'm gonna tighten these little nuts down.
And make sure you have all the bolts out of your case.
We're ready to split the cases now,
but if you missed a bolt,
you're gonna have a really hard time getting this apart
and you're probably gonna break something.
So, with all the bolts out, I'm ready to split the case.
Alright, so I'm gonna use a 17 millimeter socket or wrench,
put on the tool and I'm going to start tightening it.
Now, a lot of these cases, like this Yamaha case,
they don't use a center gasket,
they're actually glued together, pretty much.
And so, the cases can stick pretty tight.
You also have the bearing on the crank sticking
and even the bearing on your countershaft
sticking a little bit.
So, you know, when a bike's been together
for a long time, things stick together.
You end up putting a lot of force on this
and you need to be careful
because if you put too much force,
you know, you could maybe throw your crank out of wack,
but you could also break the tool.
Like I said, this is really hard steel.
It's not gonna give much,
it's gonna break before it bends.
So, one thing I like to do
when I get pretty decent amount of tension on there,
I like to take a hammer,
rubber mallet or hammer,
and give this a tap,
like so.
I don't wanna pound on it and hurt anything,
but if you give it a little tap like that,
even on your countershaft, a tiny bit,
it shocks the cases, shocks the bearing a little bit,
and kinda breaks things loose
so you're not putting a ton of force on this crank splitter.
So, as you can see, the cases are starting to split apart
but you'll notice that it's splitting apart
more in the front than the back,
so something's hanging up in the back here.
And we want this to come apart
as evenly as possible,
so we don't wanna go too far without that back coming out.
So, something you can do, again,
with a rubber mallet or a dead blow,
kinda hit on the countershaft
and then that worked.
I'm kinda pulling up on the case.
There's a little tab back here I'm pulling up on.
That's got me pretty even,
sometimes you actually have to take the dead blow
and hit that little tab.
There's a dowel in here where your swingarm bolt goes in,
it kinda holds the case together sometimes,
so, you know, sometimes you just have
to tap it apart a little bit,
but the goal is to get the case,
the cases to come apart evenly.
Whatever you do when you're pulling these apart,
you never wanna get a screwdriver or anything
and wedge it in between your cases to break them apart.
That's going to ruin the gasket sealing surface,
so a dead blow's nice
and it usually just takes little taps to get it apart.
And that's pretty much it.
Once the cases are split,
you can tell that the cases are apart
because that tool's really easy to turn now,
so I'm gonna go ahead and take the tool back off.
Now we can go ahead and pull the two case halves apart.
Course, I always watch for any washers
that may be on in the bearings
and the transmission.
But anyway, that's it.
So,
nice tool to have,
it's a must tool if you're gonna get inside your engine.
Now, to get the crank out,
I would just do the same process
on the other side of the crank
and push it out of the case from the other side.
Be sure and subscribe to our YouTube channel.
Check out the other videos we have there.
I've got a video where we totally do an engine tear-down,
so you can check that out.
If you wanna see more,
be sure and check out our website
for tools like this and others
to help you maintain your motorcycle, ATV, and UTV.
Thanks for watching.