Gday selling power valve spring tuning Kit to suit 300 2 strokes best bang for buck mod you can do 

Red spring (wild)

Yellow (mid) 
Green (Mild)

96-22 KTM 250/300/360/380 MXC/SX/XC/XCW/EXC/6D/TPI

23 KTM 250/300 XC-W TPI/EXC TPI

23 Husqavrna TEi
16-22 Husqvarna TC 125
17-23 Husqvarna TE 125/150/i
Beta 200/250/300RR

11-14 Husaberg TE/TC 250/300
21-23 GasGas EC/EX 250/300
16-22 KTM 125 SX
17-23 KTM 150 XC-W/EXC/tpi
14-22 Husqvarna TE/TC/TX 250/300/i