Hedge Trimmers · part-number series 4237

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC, HS 86 R, HS 86 T

14 exploded views, 391 part numbers.

Factory tuning settings

Idle speed	2,800 rpm
Max speed	9,100 rpm
H screw (high speed)	3/4 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 24
B Ignition system, Clutch 18
C Rewind starter 19
D Rewind starter ErgoStart/Easy2Start 18
E Air filter 25
F Carburetor C1Q-S225, S218, -S196, -S197, -S105, -S111, -S115C, -S116B 35
G Carburetor C1Q-S198, C1Q-S140B 29
H Handle frame, Fuel tank 28
J Control handle HS 81 17
K Control handle HS 86 18
L Gear head HS 81 T, 86 T 21
M Gear head HS 81 R, 86 R 25
N Cutter bar HS 81 50
O Cutter bar HS 86 64

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