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Gravely 18-G vs Yamaha YT6700
Verdict: Gravely 18-G vs Yamaha YT6700
The Gravely 18-G and the Yamaha YT6700 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 18 hp. Yamaha YT6700 is the lighter machine (238 kg vs 391 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely 18-G holds more fuel (20.1 L vs 9.5 L) for longer stints between fills. Yamaha YT6700 is the newer design (1990 vs 1988). 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
Gravely
62
Fit score
Best match
Clear
Yamaha
62
Fit score
Best match
Clear
Rated power
18 hp
18 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
GravelyReference
YamahaReference
air-cooledReference
air-cooled vertical-shaft V-TwinReference
Engine
Fuel tank
20.1 LReference
9.5 LReference
Displacement
42.18 ciReference
34.97 ciReference
Bore/Stroke
79 x 70 mmReference
78 x 60 mmReference
Power (gross)
13.4 kWReference
13.4 kWReference
Rated RPM
3300Reference
—
Starter
electricReference
electricReference
Starter volts
12Reference
12Reference
Oil capacity
5.7 LReference
1.8 LReference
Compression
—
8.6:1Reference
Sparkplug
—
NGK BPR5HSReference
Sparkplug gap
—
0.660 mmReference
Transmission
Type
shaft-driven gearReference
belt-driven hydrostaticReference
Gears
8 forward and 4 reverseReference
—
Oil type
SC10W-30Reference
—
Dimensions
Wheelbase
132 cmReference
117 cmReference
Weight
391 kgReference
238 kgReference
Front tire
16x7.50-8Reference
15x6.00-6Reference
Rear tire
23x10.50-12Reference
20x10.00-8Reference
Lawn/turf front
16x7.50-8Reference
15x6.00-6Reference
Lawn/turf rear
23x10.50-12Reference
20x10.00-8Reference
Length
208 cmReference
175 cmReference
Width
109 cmReference
142 cmReference
Height
129 cmReference
104 cmReference
Shipping weight
—
238 kgReference
Front tread
—
73 cmReference
Rear tread
—
72 cmReference
Gravely 18-G attachments
Electrical
Ground
negativeReference
negativeReference
Charging amps
15Reference
7Reference
Battery volts
12Reference
12Reference
Battery AH
42Reference
—
Battery Group
22FReference
—
Charging system
—
flywheel magnetoReference
Charging volts
—
14.5Reference
Attachment overview
PTO & Hydraulics
Mid PTO
—
independentReference
Clutch
—
electricReference
Yamaha YT6700 attachments
YT6700 Serial Numbers
Location:
—
Right side of the tractor frame, above the front axle.Reference
42" Mower deck
Cutting width
—
106 cmReference
Cut height
—
3 to 11 cmReference
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.