KB Performance, Twin Cam 88" to 95" piston kit. +.040"

Forged piston set for big bore conversion from 88" (3-3/4") to 95" (3-7/8").
Compression ratio 9.25:1 with 85cc cylinder head.
Piston weight 350g
Piston pin weight 89g.
Piston pin diameter .927" / offset.
Cylinder head type: Dome with -6.7cc.
Compression height 1.263".
Diameter 3.875".
4,000 RPM.
Connecting rod length 7.667".
Cylinder length 4.938".
All KB forged pistons are made from 4032 alloy, an 11% silicon alloy formed in a forging press. Forging the aluminium provides superior strength and molecular-level structural integrity, after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation or pre-ignition, offering the best resistance to cracking. Although 4032 has a low expansion rate, it is higher than that of cast Hypereutectic. Therefore, KB forged pistons will require a piston-to-wall clearance of approximately .001". The pistons are sold as sets, complete with wrist pin retaining rings, wrist pins and piston rings.
Note: All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and a rear section on the piston and it must be installed the correct way round. Please read the installation instructions provided with each piston set before installation.


Specifications


Brand
KB Performance Piston


Application
99-06 88" Twin Cam (NU)


Sales unit
Set


Material
Aluminium


Packaging weight
1.107 kg


HS Code
84099100


Motorcycle family
DYNA, SOFTAIL, TOURING


Original name
KB Performance, 88" to 95" Twin Cam piston kit. +.040"