Introducing theFZ engine. Just
safe to leave the
board.
One way to tell you what
our new FZ750 engine is, is to
tell you what it isn't.
What it isn't, is another
high performance powerplant.
You can find oneofthoseonany
canyon bike you care to name.
What it is,isa radicallynew
engine concept lurking beterior ofa
neath the familiarex
liquid-cooled,in-lineDOHCfour.
And because the valves are amounts of fuel efficiencyand
extremelylight,the engine revs flexibility along the way.
to an extraordinary 11,800 rpm.
It doesn't.
Conventional wisdom also
While our five-valve engine
has it that the cylinders be nearly vert ical.
Yamaha wisdom
has it that with the cyl- I
\
inders set at 45~ the \
•
I
•
I
engine will chum out
~ .". ~
".~
unthinkable amounts
,
I
I
I
I
I
I
I
of horsepower.
'Iechnology has gone
It does.
·11· l ama/lOSexd usire 5-rah'('Q"lilldrr head - 3 intake, exha ust -«
to our head.
Because tl1e cyI1 dramatically increases horsepower tillvughoptimum/2lid combustion.
Conventional wisdom has del'S lean so far forward, the FZ develops more horsepower
can use special downdraft car- and torque than a comparable
it that the four-valve cylinder
~\,Which, in effect, four-valve engine, it also uses
uretors.
"
head is the way to go.
"
Yamaha G{!:~
£/('0 ram the mix- less fuel.
wisd?m has it ~ ~ /-;;:;:;:? tur~ into the
~~
And even though top speed
1 ~\~
~
,{ , engmefor even is just this side of a Formula
that Ifa fourVI ' : 'dI~J , > " \ more efficient One racer, the FZ has the lowvalve system is
good, then a
~;~~r~':)iif~
'I' combusti~n.
speed tractability of a Schwinn.
five-valve sys~,
i_
And sll1ce
Tiltillg thr
45°
. '
. ht weII be bettet. FZll rarlyaolilUlcrsuxighthdpslfil~thr the mtake pott s
50150
distribution.
tem mig
It is.
are nearly straight,the mixThe FZbreathes with as- ture doesn't make horsepowertounding efficiency. The three robbing detours along the way.
intake and two exhaust valves,
Fmally, conventionalwisdom TheBqmm dOl('1uiraf/ C 1Tcarburetors "ram"themixtur e
in combination with the hemi- assumes that in order for an en- intothe enginefor bettorcombustion.
So much for conventional
spherical combustion chamber, gine to produce the aforemendeliver better fuel combustion. tioned amounts of horsepower, wisdom.
See you at the track.
Translation: more horsepower. it has to give up significant
, 0;
. '
.
.,
".
".
