Service Manual

SPECIFICATIONS
2
Specifications
Engine Specifications (All dimensions are for a new engine)
Item DuraForce R tek
Type Reed valve 2-cycle Piston ported 2-cycle
Bore
Stroke
Wrist pin diameter
Crankpin diameter
End play (crankshaft)
.
0 - .017" (0 - .431mm) Walk mower
.
0 - .017" (0 - .431mm) 1998 Snow
0 - .0215" (0 - .533mm) 1999 and
later Snow
Side play (crankshaft) near lower main
Piston cyl. Clearance (tightest loc.)
Wrist pin hole diameter
Bottom ring thickness, new
End gap, new (both rings)
Displacement
Horsepower 6.5HP 4 or 5HP
Compression ratio
Compression
Carburetor
Dual-circuit Lawn-Boy with fixed jets, float type with primer and choke
Fuel required
Mix ratio 32:1 50:1
Recommended Oil
.
Lawn-Boy Generation II 2-cycle
oil or NMMA TCW3 Toro 2-cycle oil or NMMA TCW3
Fuel tank capacity
Ignition type
CD Pack air gap
Spark plug / air gap
Start system Rope rewind or 12 VDC Rope rewind or 120 VAC
Governor
Governed Engine Speed
.
2900 +
300 rpm
.
4HP runs at 3700 +
300
CCR 2400 - 3700
5HP runs at 3800 +
300 rpm
CCR 2450 & 2500 - 3800 rpm
CCR 3600 - 3900 rpm
CCR 3650 - 4000 rpm
Snow Commander - 4000 rpm
All snow engines are +
300 rpm
Idle Speed 2200 - 2800 rpm N/A
A
ir Cleaner
.
Oiled foam type with Centrifugal
pre-cleaner N/A
Air vane
Unleaded regular (87 octane R+M/2):2-cycle oil
Varies with product
Solid-state CD Pack, magneto type
NGK projected nose / NGK BPMR4A .030" (.76mm)
.010" (.25mm)
.016/.008 in. (.40/.20mm)
8.6 cu in. (141cc)
5.8:1
Approximately 115 psi. Service limit 80 psi.
.0006" + .0003 - .0006 (.015mm + .008 - .015)
.0035" to .0059" (.089 to .150mm)
.500"/.5005" (12.705mm / 12.712mm)
.0600 +
.0005 (1.52mm + .013)
2.5000" +
.0005 (63.5mm + .0127)
1.75" (44.45mm)
.5000" + .0000 - .0002 (12.70mm + .000 - .005)
.7427" + .0003 - .0002 (18.85mm + .008 - .005)