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55
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1448 cc 10.5:1 Compression 3 3/4" Bore
STD
.005
.010
.020
.030
Piston Kit
Wiseco Rings
1550cc Big Bore Kit 9:1 Compression 3.875" Bore, 4"stroke
Piston Kits include Hastings X Ring Pack
STD
.005
.010
.020
Piston Kit
Wiseco Rings
1550cc Big Bore Kit 10.5:1 Compression 3.875" Bore, 4"stroke
Piston Kits include Hastings X Ring Pack
STD
.005
.010
.020
.030
Piston Kit
Wiseco Rings
1
9
8
4
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9
9
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P
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1340cc 8.5:1 Stock Compression 3
1
/
2
" Bore. Piston Kits include Hastings X Ring Pack.
STD
.010
.020
.030
.040
Piston Kit 11-9830
Wiseco Rings 11-9759
1340cc 10:1 Compression 3
1
/
2
" Bore. Piston Kits include Hastings X Ring Pack.
STD
.005
.010
.020
.030
.040
Piston Kit 11-9895
Wiseco Rings 11-9759
1340cc 11:1 Compression 3
1
/
2
" Bore Piston Kit include Hastings X Ring Pack.
STD
.005
.010
.020
.030
.040
Piston Kit 11-9840
Wiseco Rings 11-9759
1340cc 9.25:1 Compression 3
5
/
8
" Bore Stock Stroke.Includes head and base gas-
ket. Achieves 88 cu in. Piston Kits include Hastings X Ring Pack.
STD
.005
.010
.020
.030
Piston Kit 11-9903
Wiseco Rings 11-9908
1340cc 3.75" Bore, 93.4"
STD
.005
.010
.020
.030
Piston Kit 11-1699
—
—
—
—
Wiseco Rings 11-9971
—
—
—
—
Wiseco Replacement Wrist Pins
are sold each. Bore size is 3 1/2". Fits
1340 Evo.
VT No. 11-9778
Wiseco Replacement
Circlips fit all Wiseco pis-
tons, available in pairs.
VT No. Fits
11-9773 3 7/16" & 3 1/2" Bore Pistons
11-9774 3 3/4" Bore Pistons
Forged Piston Kits
KB PERFORMANCE PISTONS
The Keith Black 390 Hypereutectic alloy is cast in a permanent steel mold
which makes it possible to build a light weight piston that makes more power and
uses less fuel and lasts longer than any other type of piston being made today.
We can now forget about running loose, noisy, oil-burning pistons. The low heat
transfer of the alloy keeps the skir ts cool so piston expansion is minimal. Test
engines have run with as little as .0005" (1/2 thousandth) piston-to-wall clearance.
The combination of a low heat transfer piston alloy and high compression ring
placement increases power and economy. The high ring placement alone
reduces detonation and increases the top ring temperature. It is important to see
our ring end gap instructions to avoid ring butting.
The KB piston will make maximum power at 2 to 4 degrees less total timing than conventional pistons.
All KB piston sets are supplied with Hastings Moly Ring sets. Safe top ring end gaps can be found by
multiplying the bore diameter by the appropriate ring end gap factor from the adjoining chart.
Example: 3.5" bore “Street Normally Aspirated" = 3.5" bore x .0065" = .023" top ring end gap.
Note: Second ring end gaps do not need extra clearance
Engine
1340cc 1340cc 1340cc TC-88 TC-88 TC-88
Evolution Evolution Evolution
Model
FLH-FX FL-FX FL-FX FL-FX FL-FX FL-FX
Years
1984-up 1984-up 1984-up
C.I.D.
0"
80"
80"
88"
88"95"
Bore
3.498 3.498 3.498
3.750" 3.750" 3.875"
Stroke
4.250" 4.250" 4.250" 4.00" 4.00" 4.00"
Cyl Height 5.550" 5.550" 5.550" 4.938" 4.938" 4.938"
Comp. Ratio 8.5:1
9.5:1
10.5:1 8.5:1 9.25:1 9.25:1
STD
.005
.010
.020
.030
.040
RING END PISTON TO WALL
APPLICATION
GAP FACTOR CLEARANCE
Street Normally Aspirated
.0065"
.00075"-.0015"
Street Nitrous or Supercharged .0080"
.0015"-.0025"
Flat Track Gasoline
.0080"
.0010"-.0030"
Flat Track Alcohol
.0060"
.0010"-.0030"
Drag Gasoline
.0075"
.0010"-.0030"
Drag Alcohol
.0065"
.0010"-.0030"
Drag Supercharged or Nitrous Gas .0095"
.0015"-.0030"
Drag Supercharged Alcohol
.0085"
.0010"-.0030"
Drag Supercharged Fuel
.0115"
.0020"-.0040"
Note: All Wiseco Rings are sold per pis-
ton.