Blowers · part-number series 4203

BR 340, BR 340 L, BR 380, BR 420, BR 420 C

13 exploded views, 406 part numbers.

Factory tuning settings

Idle speed	3,100 rpm
L screw (low speed)	1/4 turn
H screw (high speed)	1/4 turn
Confidence	sourced

Screw figures are turns open from lightly seated. Set the final mixture by ear and tachometer against the machine in front of you — running a two-stroke lean to hit a published number is how pistons get scored.

A Crankcase, Cylinder 33
B Rewind starter, Muffler 31
C Air filter, Ignition system 37
D Carburetor HD-28A, HD-29, HD-45 43
E Carburetor BR 340 L WT-580 38
F Fan housing 19
G Backplate 45
H Pleated hose, Blower tube 19
J Control handle 33
K Control handle (46.2001) 27
L Control handle BR 420 C (46.2001) 28
M Vacuum attachment 16
N Conversion kit BR/SR 37

Others on part-number series 4203

These share the powerhead, so a sheet you cannot find here may be filed under one of them. That does not make every part interchangeable — check yours.

· BR 320, BR 320 L, BR 400 10
· SR 340, SR 420 12
· SR 320, SR 400 12

Parts are not interchangeable across series — check yours before ordering.