The chamber is tDo good for the
competition.
Which is why only Honda can offer
the AutDmatic Torque Amplification
Chamber (ATACTM). A system proven on
our Grand Prix motDcross machines.
Available now on the 1984 CR125R
andCR250R.
ATAC consists of a sub-chamber
attached tD the expansion chamber.
It utilizes exhaust resonance tD dramatically boost low and midrange power.
As rpms build, a simple
linkage system driven
off the crankshaft
gradually closes a butterfly valve on the
sub-chamber.
promising tDp-end .
punch.
A revolutionary
system like ATAC
deserves an engine
that's
just as
ATA C, aur exclusive A utomatic 'Rmlue A mplijicatian
Chamher, 'UJCffks to improve low
and mid-range torgue. The ATAC
system closes offprogressively as
rpms build, leaving high-rpm
duties to aur new expansian
chamher, which is designedJor
maximum peak horsepower.
At ltigh rpm, the sub-chamber is completely closed and only
our new expansion chamber is in use.
It's designed for peak horsepower tD
complement ATAC.
WithATAC, the CR125Rand the
CR250R are able tD deliver loads aflow
and mid-range tDrque without com-
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