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The machined insert that forms the combustion chamber in a two-piece head: it sets the engine’s compression.
Available in several combustion-chamber volumes.
VHM offers this cylinder head insert for TM RACING MX 250 1999-2014. On a two-piece head, the insert (the "dome") forms the combustion chamber. Its volume and shape set the compression and the character of the engine.
The benefits:
Signs of detonation, leaking O-rings or the wish to change the compression: the insert can be swapped in minutes, with new O-rings.
Available in several combustion-chamber volumes: a smaller volume raises compression (more punch, quality fuel essential), a larger one lowers it (smoother engine).
Cross-Mania tip: Fit new O-rings, tighten in a cross pattern to the specified torque and, with a higher-compression insert, use high-octane fuel.
Check the exact model and year of your bike in the list below before ordering.
Fits:
TM RACING MX 250 2014
TM RACING MX 250 2013
TM RACING MX 250 2012
TM RACING MX 250 2011
TM RACING MX 250 2010
TM RACING MX 250 2009
TM RACING MX 250 2008
TM RACING MX 250 2007
TM RACING MX 250 2006
TM RACING MX 250 2005
TM RACING MX 250 2004
TM RACING MX 250 2003
TM RACING MX 250 2002
TM RACING MX 250 2001
TM RACING MX 250 2000
TM RACING MX 250 1999
Click on your bike to see all compatible parts.
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