Honda UMK431 User Manual

TECHNICAL & CONSUMER INFORMATION
Air cleaner
3,100 +200 rpm
Idle speed
single element, semi-dry
I FRAME I
UMK422K1
UMK431 K1
Engine switch
Slide type
I Throttle control I Two motion trigger style I
Main pipe diameter
solid 0.28 in.
(7 mm)
Drive shaft
0.08 in (2.0 mm)
0.06 in
(1.5 mm)
Main pipe thickness
1.02 in (26 mm)
0.94 in (24 mm)
Shaft support bushings
3-1 /I 6 inch, 7 spline
2-1/8 inch, 7 spline
Clutch type
4,400 rpm
Clutch engagement
Sealed ball bearings, helical cut gears, no shims required
Gearbox type
1.33
1.31 Gearbox ratio
7
5
Tuneup
ITEM
No other adjustments needed.
Other specifications
See your authorized
Intake:
0.1 2 k 0.02 mm
Valve clearance (cold)
(0.60 - 0.70 mm)
Refer to page: 28
0.024 - 0.028 in
Spark plug gap
MAINTENANCE
SPECIFICATION
Exhaust: 0.15 f 0.02 mm
Honda dealer
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Honda UMK431 Specifications

General

Brand	Honda
Model	UMK431
Category	Trimmer
Language	English