Carburetor Adjustment Screws are designed as a direct replacement for stock Carburetor Air and Idle Screws.They allow for easy on-the-fly adjustments without the need for tools.Constructed from 6061-T6 Aluminum and anodized for a clean finish they work with stock springs and o-rings.These screws are compatible with 2 stroke carburetors. Fitment list includes various models from multiple brands such as and with model ranges spanning different years.Examples of compatible models include but are not limited to: - From : 250 300 and XTRAINER 300 - From : TE 125 TE 250 and TE 300 - From : 105 SX 105 XC 125 EXC 125 SX 144 SX 150 SX 150 XC 200 EXC 200 MXC 200 XC 200 XC-W 250 EXC 250 MXC 250 SX 250 XC 250 XC-W (E-Start) 300 EXC 300 MXC 300 XC 300 XC-W 300 XC-W (E-Start) 300 XC-W 360 EXC 360 MXC 360 SX 380 EXC 380 MXC 380 SX 85 SX and Freeride 250 R - From : YZ250 YZ250X and YZ85 These adjustment screws are intended for use on specific models within specified year ranges.The compatibility information covers a wide range of two-stroke motorcycles across several manufacturers. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.