Yamaha RD400 - Modification; Manifold; Piston; Exhaust Pipe & Muffler

MODIFICATION
C
tntet
port
@
Exhaust
port
@
Scauenging
ports
(Transfer)
REMARKS
Due to change of
inlet
port
timing
Better
engine
perf
ormance
ru
5. MANIFOLD
(For
RD400
ON LY)
For better engine
performance,
both right
and
left
manifolds are
provided
with balance
pipe.
t
t
t
7
have
been
t
PORT TIMING
(MM)
77 MODEL
,78
MODEL
A
33.5 <_
B 395 41 5
c
640 68.5
nn
oo
trN
ocn
oo
ffiffi.)
PISTON
(For
RD400
ONLY)
Change
in
shape
EXHAUST PIPE
&
MUFFLER
Both inside diameter and
volume
changed.