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Gilson 431 vs Sears 399 Hillary
Verdict: Gilson 431 vs Sears 399 Hillary
The Gilson 431 and the Sears 399 Hillary are both snowmobiles — here is how they stack up on the figures that matter. Both are rated at the same 23 hp. Gilson 431 is the newer design (1971 vs 1969). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
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Fit & specs
Gilson
62
Fit score
Best match
Clear
Sears
62
Fit score
Best match
Clear
Rated power
23 hp
23 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
GilsonReference
OMCReference
air-cooledReference
air-cooledReference
Suspension
bogie wheelReference
bogie wheelsReference
Distributor
—
SearsReference
Engine
Displacement
20.44 ciReference
24.4 ciReference
Bore/Stroke
75 x 76 mmReference
65 x 60 mmReference
Power
17.2 kWReference
17.2 kWReference
Rated RPM
6000Reference
5500Reference
Starter type
manual recoilReference
—
Fuel tank
—
17.0 LReference
Cooling system
—
fanReference
Compression
—
11.5:1Reference
Starter
—
electricReference
Starter volts
—
12Reference
Dimensions
Weight
161 kgReference
—
Length
248 cmReference
255 cmReference
Width
82 cmReference
81 cmReference
Height
99 cmReference
114 cmReference
Track width
55 cmReference
52 cmReference
399 Serial Numbers
Location:
—
Serial number plate on the right side of the tunnel towards the rear.Reference
Electrical
Ground
—
negativeReference
Battery volts
—
12Reference
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.