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
1996-2004	Honda	XR400R	Base
2014-2015	Husqvarna	FC450	Base
2014-2016	Husqvarna	FE450	Base
2003-2006	Kawasaki	KFX400	Base
2004-2009	Kawasaki	KFX700	Base
2004-2006	Kawasaki	KVF700 Prairie 4x4	Base
2005-2011	Kawasaki	KVF750 Brute Force 4x4i	Base
2013-2015	KTM	450 EXC	Base
2005-2006	KTM	450 SMR	Base
2013-2016	KTM	450 SX-F	Base
2013-2015	KTM	450 XC-F	Base
2013-2015	KTM	450 XC-W	Base
2000-2002	KTM	520 EXC	Base
2000-2002	KTM	520 SX	Base
2003-2007	KTM	525 EXC	Base
2004-2006	KTM	525 SMR	Base
2003-2006	KTM	525 SX	Base
2014	Polaris	RZR 800	Base
2000-2016	Suzuki	DR-Z400	Base
2016-2017	Yamaha	WR450F	Base
2004-2013	Yamaha	YFZ450	Base
2009-2019	Yamaha	YFZ450R	Base
2014-2017	Yamaha	YZ450F	Base
2016-2017	Yamaha	YZ450FX	Base