VHM 2-Piece Cylinder Heads and inserts

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VHM 2 PIECE CYLINDER HEADS

The two piece design allows the convenient and cost effective solution to getting the correct compression ratio as well as more efficient cooling.
The CNC machined outer cover takes an insert of your choice. There are a number of different profiles available for various fuels and performance levels.
VHM is constantly developing new profiles and if you want to develop your own, we can supply you with blanks to machine yourself.
We recommend you also consider the VHM setting tool (AM34013 and AM36007). All VHM inserts come with a piston protrusion measurement that the head is machined to. Using the tool you simply set the squish by the amount the piston sticks out of the top of the cylinder. This save the hassle of using solder and is really accurate allowing a small amount of adjustment, or ensuring your bang on every time you change your sometimes not so bang on pistons. You also ensure you have constant port timing on your cylinder.
If you run different cylinder heights, VHM will, by special order make inserts to suit.

	Note: The Volume is calculated on the bike by filling to the top of the spark plug hole. The volume of the spark plug hole is 2.50cc (11.20cc is 8.70cc volume with plug installed)
AA33035	VHM Head for RS125 - These Insets (6mm thick) will also fit the AA33056 head below
AE32050-067	VHM RS125 Insert +2.00mm piston height, 10.00cc Volume, .60mm squish - Ian E Special - dome diameter 42mm LOW RAD, SHORT SQUIRTY CIRCUIT AND DYNO LOVERS (THEY SEE GOOD HP WITH THIS) PIKES PEAK AND BUTTON WILLOW FOR EG MR8 /C12 OR SIMILAR LEADED FUEL ONLY
AE32050-068	VHM RS125 Insert to run MR8 Fuel, insert +2.00mm piston height, 10.2cc .60mm sq - Ian E Special - dome diameter 42mm - GREAT EVERYWHERE EXCEPT LONG LONG FAST TRACKS LIKE ROAD AMERICA MR8 / C12 - C12 and MR8 run same in compression, only jetting is different. LEADED FUEL ONLY
AE32050-A	VHM RS125 Blank Insert so you can cut your own profile (machine shop required)
AE32050-D	VHM RS125 Insert for High Octane Unleaded 104+, 11.2cc .65mm - sq HIGH OCTANE (101+ RON) UNLEADED. This UNLEADED IN THE US IS A DIFFICULT ONE .... FIM SPEC UNLEAEDED NEEDS 11.4 AND LOWER ( 11.6 /8 ) BUT A LOT OF US UNLEAEDED RACE GAS HAS RON NUMBERS OF UP TO 107, AND CAN TAKE SIMILAR COMPRESSIONS TO MR8
AE32050-E	VHM RS125 Insert for High Octane Unleaded 104+, 11.4cc .65mm - sq HIGH OCTANE (101+ RON) UNLEADED.
AE32050-F	VHM RS125 Insert for High Octane Unleaded 104+, 11.6cc .65mm - sq HIGH OCTANE (101+ RON) UNLEADED.

	For Leaded fuel (recommended), there are many options we can custom order - contact us and we can talk about options that will work best for your bike

AA33056	VHM Head for RS125 A-Kit - 6 Stud - These Insets (6mm thick) will also fit the
AE32052-G	11.20 / -0.45 / 0.65 insert for use with flat top piston (JHA or equal) (Non powervalve kit) - FLAT PISTON
AE32052-H	11.40 / -0.45 / 0.65 insert for use with flat top piston (JHA or equal) (Non powervalve kit) - FLAT PISTON
AE32052-K	11.60 / -0.45 / 0.65 insert for use with flat top piston (JHA or equal) (Non powervalve kit) - FLAT PISTON

AE32052-125	10.60 / -0.45 / 0.65 insert for use with flat top piston (JHA or equal) (Non powervalve kit) - FLAT PISTON
AE32052-58	11.60 / -0.40 / 0.60 insert for use with flat top piston (JHA or equal) (Non powervalve kit) - FLAT PISTON
AE32052-19	10.00 / -0.45 / 0.65 insert for use with flat top piston (JHA or equal) (Non powervalve kit) - FLAT PISTON

	VHM Head for RS125 with Power valve - 6 Stud - Insets (7mm thick)
AE32067-232	RS125 A-kit (6-stud) cylinder head AA33079 (with powervalve) 9.80cc / +2.00 / 0.65 - Ian E Special - dome diameter �42mm

AE32067-235	RS125 A-kit (6-stud) cylinderhead AA33079 (with powervalve) 10.40cc / +2.00 / 0.65 - Ian E Special - dome diameter �42mm
AE32067-234	RS125 A-kit (6-stud) cylinder head AA33079 (with powervalve) 10.20 / +2.00 / 0.65 - Ian E Special - dome diameter �42mm



AA33028-1	VHM Head for Yamaha TZ125 1994+
AE32036-94	TZ125 '03-07 10.00cc / 0.00 / 0.78 - Kit Profile
AE32036-95	TZ125 '03-07 10.20 / 0.00 / 0.78 - Kit Profile
AE32036-96	TZ125 '03-07 10.40cc / 0.00 / 0.78 - Kit Profile

AA33065	VHM Head for Yamaha TZ250 2003-2007 set of 2
AE32080-A	Yamaha TZ250 2003 Insert blind - so you can cut your own profile
AE32080-C	Yamaha TZ250 2003 Insert 0.0mm piston height, 11.80cc Volume, .8mm squish
AE32080-E	Yamaha TZ250 2003 Insert 0.0mm piston height, 12.0cc Volume, .8mm squish
AE32080-F	Yamaha TZ250 2003 Insert 0.0mm piston height, 12.2cc Volume, .8mm squish



AA33028	VHM Head for TZ250 1995-2002 set of 2
AE32036-075	VHM Yamaha TZ250 thru 2002 Insert 0.00mm piston height, 10.20cc Volume, .70mm squish - for 54mm piston


AA33036	VHM Head for Honda RS250 2001>
AE32051-086	VHM RS250 '01up Insert +2.10mm piston height, 10.80cc Volume, .65mm squish - Ian E Special - dome diameter �42mm
AE32051-130	std RS250`01-> cylinderhead (dome piston) 10.40 / +2.10 / 0.65 - Ian E Special - dome diameter �42mm
AE32051-148	VHM Honda RS250 Insert +2.00mm piston height, 10.00cc Volume, .60mm squish - Ian E Special - dome diameter �42mm
AE32051-A	Insert blind - so you can cut your own profile
AE32051-D	+2.10mm piston height, 11.80cc Volume, .65mm squish
AE32051-E	+2.10mm piston height, 12.00cc Volume, .65mm squish
AE32051-F	+2.10mm piston height, 12.20cc Volume, .65mm squish
AE32051-G	+2.10mm piston height, 12.40cc Volume, .65mm squish
AE32051-H	+2.10mm piston height, 12.60cc Volume, .65mm squish
AE32051-J	+2.10mm piston height, 12.80cc Volume, .65mm squish


AA33042	Honda 2003 CR250 2002-2004 headset
AE32060-L	+0.30mm piston height, 19.80cc Volume, 1.3mm squish
AM34010	VHM Piston Height tool - 2046S Mitutoyo Dial Indicator and AN34010 base
AM36007	Dial Indicator Holex fits VHM deck height tool

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