Motocross and enduro mixture adjustment screws - precise control of carburetor operation
( number of products: 18 )
Śruba regulacji mieszanki przedłużona HONDA CRF 250/450R TRX 450R KAWASAKI KXF KTM SXF/EXCF POLARIS All Balls
Śruba regulacji mieszanki KTM EXC 520 00-02 RALLYE 660 01-05 SX 400 00-02 SUZUKI DRZ400E 00-03 YAMAHA WR400F 98-99 YZ400F 98-99 All Balls
Fuel/air mixture screw is a small but crucial element of the carburetor. It allows you to precisely set the proportions of fuel and air going to the engine, which affects the smooth operation, reaction to gas and combustion. At Bajamoto you will find mixture adjustment screws for Keihin, Mikuni and other carburetors used in KTM, Honda, Yamaha, Husqvarna, GasGas motorcycles - from the Zeta Racing, FM-Parts, ProX and All Balls brands.
Why is mixture composition regulation so important?
Even a perfectly clean carburetor will not function properly without proper setting of the fuel-air mixture. Too rich a mixture leads to engine flooding and high fuel consumption, and too lean a mixture to overheating and piston seizure. The adjustment screw allows you to adjust the parameters to weather conditions, altitude above sea level or track type.
- improves the smoothness of the engine and response to gas,
- facilitates starting and stabilizes idle speed,
- reduces the risk of overheating and engine seizure,
- allows you to easily adjust the mixture composition to driving conditions,
- allows adjustment without dismantling the carburetor (CNC versions with a knob).
Types of motocross and enduro mixture adjustment screws
- OEM Replacement screws – classic screws for Keihin and Mikuni,
- CNC Zeta / FM-Parts screws – anodized, with a large knob for adjustment without tools,
- Screws with a set of seals – complete with O-ring, spring and washer
- ProX / Tourmax screws – precisely made replacements with long service life
- Hard Enduro bolts – with increased resistance to vibration and dirt.
Best brands of motocross and enduro mixture adjustment screws
- Zeta Racing – anodized CNC screws with a quick adjustment knob
- FM-Parts – bolts for Keihin FCR and Mikuni, designed for Hard Enduro,
- ProX – OEM replacement made of hardened steel
- All Balls – adjustment sets with seals and springs
- Tourmax – Japanese precision and perfect match to Keihin/Mikuni carburetors.
How to choose the mixture adjustment screw?
Each Bajamoto motocross and enduro mixture adjustment screw has a detailed description of the carburetor type and compatible motorcycle models. Examples:
- Zeta Fuel Mixture Screw Keihin FCR KTM EXC-F 250–500 2017–2024
- FM-Parts Air Screw Mikuni TMX Yamaha YZF 250/450 2014–2023
- ProX Mixture Screw Honda CRF 250R/450R 2015–2023
When choosing a screw, pay attention to the carburetor type (Keihin, Mikuni), thread diameter and length. CNC versions with a dial are ideal for athletes who want to quickly change settings between runs or training.
How to care for the mixture adjustment screw?
When cleaning the carburetor, always remove the screw and secure its seat with a spring and O-ring. Do not tighten it too much - this is a common mistake that damages the air duct. Every few hours of operation, check whether the bolt has not come loose due to vibration. It's worth having a spare CNC screw - especially in Hard Enduro, where the carburetor often hits rocks or mud.
Precision and response with Bajamoto
Choosemotocross and enduro mixture screws from brands that understand the importance of accurate adjustment. With Zeta you'll get an ergonomic knob and anodized Factory style, FM-Parts will give you mud and impact resistance, and ProX andAll Balls will provide OEM precision. Because a well-set mixture means more power, less fuel consumption and no surprises on the track. 🔧
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