❏ When rebuilding or freshening
up your engine, servicing the cylinder can be an overlooked process.
You may think that a cylinder that is
smooth to the touch is good to go with
the new piston kit, but it could be a
ticking time bomb. It takes very specialized measuring tools and a lot of
knowledge to see if the cylinder bore
is truly round and not just a bit oval.
The cylinder walls might not be parallel for the full distance of the bore. We
had an older Yamaha Warrior cylinder that was on the second overbore.
There is a third overbore available,
but they are rare, and there is no
fourth overbore. In other words, the
bore could be repaired by boring the
steel sleeve, but if the cylinder wore at
all, there was no other repair option
other than buying a new cylinder.
You see, we often say this or that
is “hard as steel” or “hard as iron.”
Compared to marshmallows or even
aluminum, iron and steel are very
hard. But, a ceramic-metal composite
like Millennium Technologies’ propri-
etary Nickel Silicon Carbide (NSC) cyl-
inder plating process is much harder.
Since we couldn’t afford to have the
cylinder wear any further, we opted
to have Millennium Technologies
precision-bore the iron sleeve, and
then plate the fresh bore to make
sure that the cylinder will last for a
good long time. The cost to overbore
and plate a single-cylinder engine is
$249.95. Simply re-plating a cylinder
to repair a worn or peeled surface
is just $209.95. Millennium can do
more than just bore a cylinder. If you
have a plated aluminum cylinder,
as most modern high-performance
quads and UTVs do, the company
techs can repair damaged cylinders,
then bore the aluminum back to size
and plate the bore like it was from
the factory but better. It can also do
all sorts of two- and four-stroke crank
and head performance mods, head
rebuilds, valve seat and combustion
chamber repair, and a lot more.
WHAT WE THINK
Oftentimes Millennium can repair
things you wouldn’t think possible.
If you have damaged engine parts,
check to see if they can do the repairs.
In our case, they saved and added
longevity to a cylinder that was otherwise beyond saving.
Contact Millennium Technologies
at (888) 779-6885 or visit www.mt-llc
MILLENNIUM TECHNOLOGIES CYLINDER SERVICE
There are still many of Yamaha’s Warrior
350s on the trails today as well as other
older quads. Millennium Technologies
provides a good way to keep them running for years to come.
A good engine rebuliding option
By the staff of Dirt Wheels
This is what the cylinder looked like before we sent it to Millennium Technologies. It
looks okay, but it needed to be bored to make the bore itself perfectly straight and
When we got the cylinder back, the new surface looked perfect. All we needed to do
was clean it and reassemble the engine.