The chamber is too good for the
competition.
Which is why only Honda can offer
the AutDmaticTorque Amplification
Chamber (ATACTM). A system proven on
our Grand Prix motocross machines.
Available now on the 1984 CR125R
and CR250R.
ATAC consists ofa sub-chamber
attached to the expansion chamber.
It utilizes exhaust resonance to dramatically boost low and midrange power.
As rpms build,a simple
linkage system driven
off the crankshaft
gradually closes a but- -'"
terfly valve on the
sub-chamber.
ATA C, our exclusive Automatic Torque A mplijication
Chamber, works toimprooe lou:
and mid-range torque. The ATA C
ff
system closes o progressively as
rpms build, leaving high-rpm
duties to our new expansion
chamber, which is desianedfor
maximum peak horsepouer.
At high rpm,the sub-chamber is completely closed and only
our new expansion chamber is in use.
It's designed for peak horsepower to
complement ATAC.
With ATAC, the CR125R and the
CR250Rare able to deliver loads oflow
and mid-range torque without com-
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promising top-end
punch.
A revolutionary
system like ATAC .
deserves an engine
that's
just as
