Specifications—300R HD
300R HD MODELS
Attribute 300R HD
Horsepower 300
Kilowatts 221
Full throttle RPM range 5800–6400
Idle RPM in neutral gear* 600
Idle charge compensation** 600–725
Troll control RPM limit 550–1000
Number of cylinders 8
Displacement
4.6 Liter
4,576 cc (279.2 cid)
Cylinder bore 92 mm (3.62 in.)
Stroke 86 mm (3.38 in.)
Spark plug NGK LKAR7C‑9
Spark plug gap 0.9 mm (0.035 in.)
Spark plug hex size 14 mm
Sport Master ratio 1.75:1
137 mm (5.4 in.) ratio 1.75:1
Gearcase
capacity
Sport Master
RH, LH
620 mL (21.0 fl oz)
137 mm (5.4
in.) RH
720 mL (24.4 fl oz)
137 mm (5.4
in.) LH
680 mL (23.0 fl oz)
Recommended gasoline
Refer to Fuel and Oil
Recommended oil
Refer to Fuel and Oil
Engine oil capacity with oil
filter replacement
6.6 Liter (7.0 US qt)
Required battery type 12‑volt absorbed glass mat (AGM) battery
Battery
type***
USA (SAE)
800 minimum marine cranking amps (MCA)
with a minimum reserve capacity of 135
RC25 rating
International
(EN)
975 minimum cold cranking amps (CCA) with
a minimum 65 amp hour (Ah)
GENERAL INFORMATION
eng 17
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