LRP Nitro Engine Z.21R Spec.3 Pullstart

Tower Stock# LRPG2172  •  Manufacturer Stock# 32172
LRP Nitro Engine Z.21R Spec.3 Pullstart (large view)
Notes from our tech department:
This is the LRP Z.21R Spec3 .21 cu in (3.49cc) Glow Engine
with Pull Starter.


For use in 1/8 scale truggies, buggies and RTR cars
XTEC PowerCarb 14S-2 slide valve carburetor with 7.5mm venturi and
aluminum body
Specially lightened high silicium alloy piston
Oversize extra strong aluminum connecting rod
Round rear exhaust outlet (exhaust system not included)
ABC piston and liner construction "A"luminum piston fitted to a
"B"rass cylinder liner that is "C"hrome plated
12.0/9.0mm bore SG crankshaft, lightened crankshaft pin area
Ninety day limited warranty through LRP beginning at date of purchase


Z.21R Spec3 .21 cu in Engine with Pull Starter
LRP Standard R5 Glow Plug
Two Decal Sheets
Instruction Sheet


Fuel: 2-stroke model car fuel with 25% nitro content, do not exceed
36% nitro content
Exhaust System: Depending on vehicle
Glow starter, air filter, track equipment


Displacement: .21 cu in (3.49cc)
Bore: 16.40mm
Stroke: 16.40mm
Number of Ports: 3+1 (3X transfer, 1X exhaust)
Power Output: 2.12 PS
Max RPM: 34,900
Weight: 14.4oz (410g)
Carburetor Settings: Note, carburetor is preset at factory and should
only require small adjustments
Idle Screw, 0.5 - 1.0mm open
Mid Range Needle, 3 turns open from fully closed
Main Speed Needle, 3 turns open from fully closed
Distance between Mounting Holes Same Side: 0.83" (21mm)
Distance between Mounting Holes Opposite Side: 1.4" (36mm)
Height, Bottom of Crankcase to top of Cylinder Head: 4.3" (109mm)
Height, Bottom of Mounting Tab/top of Cylinder Head: 3.7" (95mm)
Length, Starter to Front Bearing: 3.1" (80mm)
Length, Starter to end of Crankshaft: 4.4" (112mm)
Width at Mounting Tabs: 1.7" (43.8mm)
Width of Crankcase below Mounting Tabs: 1.2" (31.1mm)

jxs 12/15/16

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