LCT 79cc - General Specifications

Copyright © 2018 Liquid Combustion Technology, LLC LCT Engine Service Manual: 79, 136, 179, 208, 254, 291, 306, 369, 414 & 420cc 5
General Specifications
Item 291cc 306cc 369cc 414cc 420cc
Maximum Speed 3850±50rpm 3850±50rpm 3850±50rpm 3850±50rpm 3850±50rpm
Idle Speed 2050+/-50rpm 2050+/-50rpm 2050+/-50rpm 2050+/-50rpm 2050+/-50rpm
Compression Ratio 9:1 9:1 8.1:1 8.1:1 8.1:1
Displacement 291cc 306cc 369cc 414cc 420cc
Compression Release yes yes yes yes yes
Cast Iron Sleeve yes yes yes yes yes
Bore x Stroke
3.15" x 2.28" (80mm x
58mm)
3.22" x 2.28" (82mm x
58mm)
3.34" x 2.55" (85mm x
65mm)
3.54" x 2.56" (90mm x
65mm)
3.54" x 2.59" (90mm x
66mm)
PTO Rotation
CCW (measured from PTO
side)
CCW (measured from PTO
side)
CCW (measured from PTO
side)
CCW (measured from PTO
side)
CCW (measured from PTO
side)
Fuel (DO NOT USE E85) regular unleaded gasoline regular unleaded gasoline regular unleaded gasoline regular unleaded gasoline regular unleaded gasoline
Low Oil Shutoff if equipped if equipped if equipped if equipped if equipped
Fuel Shutoff Valve yes yes yes yes yes
Oil Fill Capacity 32oz 32oz 38oz 38oz 38oz
Spark Plug Gap 0.7-0.8mm (.027-.030 in.) 0.7-0.8mm (.027-.030 in.) 0.7-0.8mm (.027-.030 in.) 0.7-0.8mm (.027-.030 in.) 0.7-0.8mm (.027-.030 in.)
Ignition Air Gap
(At Flywheel)
0.4 +/- 0.2mm 0.4 +/- 0.2mm 0.4 +/- 0.2mm 0.4 +/- 0.2mm 0.4 +/- 0.2mm
Valve Adjustment
(gap) Intake
.15 +/- .02mm (.005-
.007in)
.15 +/- .02mm (.005-
.007in)
.15 +/- .02mm (.005-
.007in)
.15 +/- .02mm (.005-
.007in)
.15 +/- .02mm (.005-
.007in)
Valve Adjustment
(gap) Exhaust
.20 +/- .02mm (.007-.009
in.)
.20 +/- .02mm (.007-.009
in.)
.20 +/- .02mm (.007-.009
in.)
.20 +/- .02mm (.007-.009
in.)
.20 +/- .02mm (.007-.009
in.)
Dry Weight
(Summer Engines)
57.32 lbs. (26kg) 57.32 lbs. (26kg) 69.45 lbs. (31.5kg) 69.45 lbs. (31.5kg) 69.45 lbs. (31.5kg)
Dry Weight
(Winter - Gen II / PW2)
61 lbs. (27.7kg) 61 lbs. (27.7kg) 72 lbs. (32.7kg) 72 lbs. (32.7kg) 72 lbs. (32.7kg)
Dry Weight (Winter - PW3) NA NA NA NA NA