90-824052R3 JUNE 2002 POWERHEAD - 4A-1
Powerhead Specifications
Block
Type 60° V, 2 Cycle. . . . . . . . . . . . . . . . . . . . .
Displacement
135 and 150 122 cu. in. (2.0 Litre). . . . . . . . . . . .
175, XR6/Mag III, 200 153 cu. in. (2.5 Litre). . . .
Reed Valve Opening
Reed Stand Open (Max.) 0.020 in. (0.50 mm). . .
Cylinder Bore
(105 Jet, 135, 150)
Dia. Standard 3.125 in. (79.375 mm). . . . . . . . .
Dia. .015 in. Oversize 3.140 in. (79.756 mm). . .
Dia. .030 in. Oversize 3.155 in. (80.137 mm). . .
(140 Jet, 175, XR6/Mag III, 200, 150XRI, 175XRI,
200XRI, Pro Max/Super Magnum 150, 200, 225)
Dia. Standard 3.501 in. (88.925 mm). . . . . . . . .
Dia. .015 in. Oversize 3.516 in. (89.306 mm). . .
Taper/Out of Round Max. 0.006 in. (0.152 mm)
Piston
(105 Jet, 135, 150)
Dia. Standard 3.115 in. ± .002 in.. . . . . . .
(79.121 mm ± .051 mm)
Dia. .015 in. Oversize 3.130 in. ± .002 in..
(79.502 mm ± .051 mm)
Dia. .030 in. Oversize 3.145 in. ± .002 in..
(79.883 mm ± .051 mm)
(140 Jet, 175, XR6/Mag III, 200, 150XRI, 175XRI,
200XRI, Pro Max/Super Magnum 150, 200, 225)
Dia. Standard 3.494 in. ± .001 in.. . . . . . .
(88.748 mm ± .025 mm)
Dia. .015 in. Oversize 3.509 in. ± .001 in..
(89.129 mm ± .025 mm)
Compression
All Models – Using a fully charged battery,
throttle shutters wide open and cylinder block
warm – 110 – 135 psi (753.3 – 924.5 kPa)
Variance between cylinders should not exceed
15 psi (102.7 kPa)
IMPORTANT: Using a micrometer, measure di-
mension “B” at location shown. Dimension “B”
should be .008 in. or less than dimension “A”.
Dimension “A”
at Right Angle
(90
°) to Piston
Pin
Dimension “B” ( in
line with Piston Pin)
1/2 in.
(12.7mm)
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