Most JE shelf pistons include double spiro locks as standard equipment. These locks are installed by spreading the lock between 1/8" and 1/4" and rotating the lock into the groove in the piston pin boss. Wire locks are installed in much the same manner but require chamfered wrist pins. Wire locks tend to spread side loads over more of the piston pin boss area and are considered to be a stronger method of holding the pin in place. Hook wire locks have a built in hook at the end gap. The purose for this style of wire lock is to prevent rotation within the lock groove itself. Tru arc locks fall between these two and can be used with the stock sharp edge wrist pins. The advantage of tru-arc locks is ease of installation and they can be re-used unlike spiro locks, however they are not recommended for medium to high horsepower applications.

This Part Fits:

Year	Make	Model	Submodel
2002-2016	Honda	CRF450R	Base
2005-2017	Honda	CRF450X	Base
2006-2014	Honda	TRX450R	Base
2006-2014,2016-2018	Kawasaki	KX450F	Base
2007-2012	KTM	450 SX-F	Base
2007-2012	KTM	450 XC-F	Base
2006-2011	Suzuki	LT-R450 QuadRacer	Base
2010-2019	Suzuki	RMX450Z	Base
2001-2002	Yamaha	WR426F	Base
2000-2002	Yamaha	YZ426F	Base