POWERHEAD
Page 4-2 90-826883R2 JUNE 1998
Specifications
HORSEPOWER
(KW)
Model 20 Jet
Model 20
Model 25
20 (14.9)
20 (14.9
25 (18.7)
CYLINDER
BLOCK
Type
Displacement
Two Cylinder - Two Cycle
24.4 cu. in. (400 cc)
STROKE Length 2.362 in. (60 mm)
CYLINDER
BORE
Diameter (Standard)
Taper/Out of Round Maximum*
Bore Type:
S/N 0G202749 and Below
S/N 0G202750 and Above
2.562 in. (65.01 mm)
0.003 in. (0.08 mm)*
Chrome
Mercosil
CRANK SHAFT Top Main Bearing Journal
Center Main Bearing Journal
Bottom Main Bearing Journal
Connecting Rod Journal
End Play
1.251 in. (31.77 mm)
1.000 in. (25.40 mm)
1.125 in. (28.58 mm)
0.883 in. (22.43 mm)
0.004-0.019 (0.10-0.64 mm)
CONNECTING
ROD
Piston Pin End (I.D.)
Crankpin End (I.D.)
0.897 in. (22.78 mm)
1.196 in. (30.38 mm)
PISTON Piston Type
O.D. at Skirt (Standard)
Ring End Gap
Aluminum
2.5583 - 2.5593 (64.98 - 65.00)
0.011-0.025 (.28 mm - .64 mm)
PISTON DIA.
Dimension “A”
at Right Angle
(90°) to Pis-
ton Pin
0.50 in.
(12.7 mm)
2.5583 in. ± .0005 in.
(64.98 mm ± .0127 mm)Using a
micrometer, measure dimension
“A” at location shown. Dimension
“A” should be 2.5583 in. ± .0005 for
a STANDARD size piston (new) Di-
mension “A” will be 0.001 -- 0.0015
less if coating is worn off piston
(used)
*Models S/N 0G202749 and Below:
NOTE: The cylinder bores are chrome and cannot be be rebored or efficiently honed.
Checkeachcylinderboreforanout-of-round“eggshaped”cylinder.Amaximumof0.003
in. (0076mm) is allowable.
*Models S/N 0G202750 and Above:
NOTE: The cylinder blockis Mercosil and the cylinders can be rebored to0.030 in. over-
sized. Check each cylinder bore for an out-of-round “egg shaped” cylinder. A maximum
of 0.003 in. (0.076mm) is allowed.
To Next Page
Loading...
Need help?
General
