VHM Pistons

VHM pistons are 100% CNC machined from high quality solid billet material. With our Takisawa lathe we are able to turn elliptical shaped pistons with very high precision.

High performance
Longevity and keeps performance during lifetime
Non-circular piston profile (and inside coating)
Resistance to detonation

Important to keep in mind the correct piston-cylinder clearance when mounting a piston, which you can find on the packing list (included in each VHM piston box). We've created an instruction video on how to measure the bore size and thus piston-cylinder clearance.

Honda	Years	Piston kit (piston, pin, ring, clips)	Pin	Clip	Ring
RS125 ND4	84-86	APHO12521743	APP1445	APC141.1SP	APR561.0
RS125 NF4	87-94	APHO12521717	APP1445	APC141.1SP	APR540.8
RS125 NX4	95+	APHO12521708 (dome)	APP1545	APC151.1SP	APR540.8
		APHO12521750 (flat top)	APP1545	APC151.1SP	APR540.8

Honda	Years	Piston kit	Pin	Clip	Ring
RS250 ND5	85-86	APHO12521743	APP1445	APC141.1SP	APR561.0
RS250 NF5	87-92	APHO12521717	APP1445	APC141.1SP	APR540.8
RS250 NX5/NXA	93+	APHO12521708 (dome)	APP1545	APC151.1SP	APR540.8
		APHO12521750 (Flat top)	APP1545	APC151.1SP	APR540.8

Aprilia	Years	Piston kit	Pin	Clip	Ring
RSW125/250	all	APAP12521745

Yamaha	Years	Piston kit	Pin	Clip	Ring
TZ125	94-97	APYA12521724	APP1647	APC161.1SP	APR561.0
TZ125 (54x54 bore engine)	98+	APYA12521716	APP1545	APC151.1SP	APR540.8
TZ250	88-99	APYA12521724	APP1647	APC161.1SP	APR561.0
TZ250 (54x54 bore engine)	00+	APYA12521716	APP1545	APC151.1SP	APR540.8
YZ125	05+	APYZ12521714