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Flat $9.95 Shipping on ALL parts orders

We offer flat $9.95 shipping on ALL parts orders. (Complete Engines, Lower Units, Sterndrives, and Oversize items excluded). In addition, orders over $89 have reduced cost express shipping available at checkout.

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Honda Lawn Mowers All Years HR HR21 SDA Parts
HR21-SDA

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Engine Specifications for
HR21-SDA

ModelModelHR21
TypeSDA
EngineEngineGV150 engine # 2029059 & subsequent
Engine Serial Number PrefixHR21
Engine Starting Serial Number1000001
Engine Ending Serial Number1051093
Valve ClearanceSee GV150 engine.
Compression85 ~ 144 psi
Engine OilNULL
Engine Oil Capacity0.65 qt.
Oil FilterNULL
Engine SpeedIdle: 1,700 rpm (blade disengaged) 1,400 rpm (blade engaged) Maximum: 3,100 ± 150 rpm (blade engaged)
TransmissionTransmission Oil CapacityNULL
FuelFloat Level8.2 mm (0.32 in.)
Fuel FilterNULL
Fuel StabilizerNULL
IgnitionSpark PlugNGK BM6A NGK BPM6A for CDI
Spark Plug Gap0.6 ~ 0.7 mm (0.024 ~ 0.028 in.) 0.9 ~ 1.0 mm (0.035 ~ 0.039 in.)
MiscGear OilNULL
Gear Oil CapacityNULL
Power Trim FluidNULL
GreaseNULL
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