Cylinder head YX 140 S1 works blue tag head
This is our first stage for the YX engine its designed to give you a better low down to mid rage torque curve for the off road riders and sill maintaining the peak top end for the fast straights.
A run down on the kit
1 x Head with controlled 56mm squish band “less heat and more torque” stock port work
1 x NBR1 6.7mm lift cam shaft inc cam sprocket 32T
1 x R11 race valve spring kit
1 x 27mm inlet and 23mm exhaust valve standard size
1 x Top set of gaskets inc base barrel gasket
The head is assembled and ready to bolt on, we recommend to run the 56mm high comp piston and a good cab like the VM26mm.
On average you will take the engine from 14 bhp to 17+bhp with 30% more torque with this kit.
Will not work with stock YX140 piston