Click Here for ALL KB Forged Pistons

KB Pistons (Made in the USA)

Available in your choice of "Cast" Hypereutectic Alloy or "Forged" 4032 Alloy

Hypereutectic Alloy is a cast 16% high silicon content material that has very high thermal barrier properties along

with a low thermal expansion rate. This alloy is perfectly suited for an air-cooled engine. Tight piston-to-cylinder clearances

are used to achieve better ring seal and a quiet running engine. Hypereutectics are best suited for Street Bikes using stock or

mild compression ratios to 10.5:1 running on pump fuel. With the high silicon content, these pistons will resist skirt wear the

best. Models that end in a C come with Anti-Friction skirt coating.

Forged 4032 Alloy is an 11% silicon alloy that is formed in a forging press then fully machined. The combination of this

alloy and forging process allows the piston to flex under detonation or pre-ignition, giving the best resistance to cracking.

Since 4032 alloy has a low expansion rate but higher than Hypereutectic, it will require about a .001 wider piston to wall

clearance. Forged pistons are suited for Street or Race with power adders such as NOS or boost. Models that end in a C

come with Anti-Friction skirt coating

 
Twin Cam Piston Sets

Twin Cam 96" to 103"

Fits 2007 up  

Cast Alloy Pistons Coated

(KB 409C)

10.5:1 with Hastings Rings

Size Std +005  +010
TEC # 33075 33076 33077
 

Twin Cam 88" to 95"

Fits '99-06    

 Cast Alloy Pistons

(KB 348)

10.5:1 with Hastings Rings

Size Std +005 +010 +020
TEC # 33095 33096 33097 33098
 

Twin Cam 88" to 95"

Fits '99-06   

Cast Alloy Pistons 

(KB 411)

9.3:1 with Hastings Rings

Size Std +005  +010
TEC # 33090 33091 33092
 

Twin Cam 88"

Fits '99-06

Cast Alloy Pistons

(KB 343)

10.6:1 with Hastings Rings

Size Std +005  +010
TEC # 33080 33081 33082
 

Twin Cam 88"

Fits '99-06   

Cast Alloy Pistons

(KB 339)

8.8:1 with Hastings Rings

Size Std +005  +010
TEC # 33085 33086 33087
 
1984-99 Evolution Piston Sets

Evolution '84-98  

 Cast Alloy Pistons

(KB 258)

8.6:1 with Hastings Rings

Size Std +005 +010 +020
TEC # 33114 33115 33116 33117
 

Evolution '84-98  

 Cast Alloy Pistons

(KB 305)

9.6:1 with Hastings Rings

Size Std +005 +010 +020 +030 +040
TEC # 33106 33107 33108 33109 33110 33111
 

Evolution '84-98  

 Cast Alloy Pistons

(KB 266)

10.5:1 with Hastings Rings

Size Std +005 +010 +020 +030 +040
TEC # 33100 33101 33102 33103 33104 33105
 
Knuckle, Panhead, & Shovelhead Piston Sets

Knuckle / Panhead & Shovelhead 74"

1941-79  

 Cast Alloy Pistons

(KB 263)

9:1 with Hastings Rings

Size Std +005 +010 +020 +030 +040 +050 +060 +070 +080
TEC # 33146 33147 33148 33149 33150 33151 33152 33153 33154 33155
 

Shovelhead Big Bore 88"-98"

1948-84   

Cast Alloy Pistons

(KB 294)

8.5:1 with 4.250 Stroke &

9.38:1 with 4.750 Stroke

Size Std +005  +010
TEC # 33187 33188 Call
 
XL 883 to 1200cc Conversion 9:1 with Hastings Rings (KB 272)
  Std +005  +010  +020 +030 +040
TEC # 33124 33125 33126 33127 33128 33129
 
XL 1200cc   1988+ 9:1 with Hastings Rings (KB 295)
  Std +010  +020
TEC # 33130 33131 33132
 
XL 1000cc  Ironhead '72-85 9:1 with Hastings Rings (KB 292)
  Std +010  +020  +030 +040 +050
TEC # 33156 33157 33158 33159 33160 33161
 
XL 900cc '57-72 9:1 with Hastings Rings (KB 340)
  Std +010  +020  +030 +040 +050
TEC # 33190 33191 33192 33193 33194 33195
 
Accessories
TEC #    
33200 Wrist Pin Fits: 883 & 1340cc
33201 Lock Ring Fits: 883 & 1340cc
33202 Wrist Pin Fits: Twin Cam 88 & 95"
33203 Lock Ring Fits: Twin Cam 88 & 95"
99110 Wrist Pin Clip Replaces OE# 22588-78