YX140 Race Head Casting

This cylinder head casting has not had the combustion chamber lip machined out therefore creating a higher compression ratio which will raise the BHP level. 
 
A standard cylinder head casting has a piston clearance seat of around 1.5mm machined out where our new race head has a minor angled edge instead. 
 
We have tested this new casting in 2021 which showed great results.
 
Spec:
Bare cylinder head casting. 
Valve Guides fitted for 5mm stems. 
Valve seats fitted and 45 degree angle pre cut for standard valve size 27mm & 23mm.
 
Please Note - WARNING:
Don't not use with thin 0.5mm race head gasket - valve to piston contact will occur.
Do not use with piston or bigger than 56mm.
If using with high compression piston you must check for correct valve overlap clearence to piston to ensure damage will not occour.
Customer to use at own risk and understands the risk of damage may occur when upgrading from standard OEM parts.
You will need to change the small camshaft bearing to a 32mm - OPTIONAL EXTRA
Must only be used with standard cylinder head gasket of 1.5mm.
 

Item Includes:
1x YX140 Race Head Casting