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Basic Specs for single cylinder, aluminum block, flat head engines.

You may be more familiar with the term "side valve" or "L head" instead of "flat head". Aluminum blocks with steel sleeves are included here.

See the table following this one for "Cast Iron" block flat heads.


Some common specs where applicable.
Initial Carb Settings; High speed=1 1/2. Idle=1 1/4.
Ring gap reject size; Compression rings=.035"(Cast Iron=.030")
Oil ring=.045"(Cast Iron=.035")
Spark Plug gap=.030"
Points gap=.020"

Basic Model
Series
Idle
Speed
Armature
Air Gap
Valve Clearance Torque
Specs
Intake Exhaust Flywheel
Nut
Cylinder
Head
Conn
Rod
60000 1750 .006"
.010"
.005"
.007"
.007"
.009"
55 ft
lbs
140
in lbs
100
in lbs
80000
81000
82000
1750 .006"
.010"
.005"
.007"
.007"
.009"
55 ft
lbs
140
in lbs
100
in lbs
90000
92000
93000
94000
95000
1750 .006"
.010"
.005"
.007"
.007"
.009"
55 ft
lbs
140
in lbs
100
in lbs
100200
100900
1750 .010"
.014"
.005"
.007"
.007"
.009"
60 ft
lbs
140
in lbs
100
in lbs
100700
10A900
10B900
10c900
1750 .006"
.010"
.005"
.007"
.007"
.009"
55 ft
lbs
140
in lbs
100
in lbs
120000 1750 .006"
.010"
.005"
.007"
.007"
.009"
55 ft
lbs
140
in lbs
100
in lbs
130000 1750 .010"
.014"
.005"
.007"
.009"
.011"
60 ft
lbs
140
in lbs
100
in lbs
170000 1750 .010"
.014"
.005"
.007"
.009"
.011"
65 ft
lbs
165
in lbs
165
in lbs
190000 1750 .010"
.014"
.005"
.007"
.009"
.011"
65 ft
lbs
165
in lbs
185
in lbs
220000 1750 .010"
.014"
.005"
.007"
.009"
.011"
65 ft
lbs
165
in lbs
185
in lbs
250000 1750 .010"
.014"
.005"
.007"
.009"
.011"
65 ft
lbs
165
in lbs
185
in lbs
280000
except
286700
1750 .010"
.014"
.005"
.007"
.009"
.011"
65 ft
lbs
165
in lbs
refer to
manual
286700 1750 .010"
.014"
.004"
.006"
.009"
.011"
65 ft
lbs
165
in lbs
refer
to manual





Flat Head Cast Iron Specs



Basic Model
Series
Idle
Speed
Armature
Air Gap
Valve Clearance Torque
Specs
Intake Exhaust Flywheel
Nut
Cylinder
Head
Conn
Rod
230000 1200 .010"
.014"
.007"
.009"
.017"
.019"
145 ft
lbs
190
in lbs
190
in lbs
240000 1200 .010"
.014"
.007"
.009"
.017"
.019"
145 ft
lbs
190
in lbs
190
in lbs
300000 1200 .010"
.014"
.007"
.009"
.017"
.019"
145 ft
lbs
190
in lbs
190
in lbs
320000 1200 .010"
.014"
.007"
.009"
.017"
.019"
145 ft
lbs
190
in lbs
190
in lbs


Go To The Lawn Mower Repair Man's "Front Page"
Go to Single Cylinder OHV non Intek Specs
Go to Flathead Twin Specs
Go to Intek Single Cyl. OHV Specs
Go to Vanguard V-Twin OHV Specs