Products Description
B45 Brush Cutter Carburetor Spring – OEM & Aftermarket Options
Precision Replacement Springs for Shindaiwa B45 Carburetor Systems
Carburetor springs are essential components for the smooth operation of the Shindaiwa B45 brushcutter. These springs, used in both TK and TK-RB carburetor models, are responsible for maintaining the correct tension on the slow air screw and metering diaphragm, which is crucial for precise fuel metering and stable engine operation . A weak or broken spring can cause a range of performance issues, from hard starting and rough idling to hesitation on acceleration and power loss.
Technical Profiles & Materials
OEM-Spec Replacement Fitment – Genuine Shindaiwa springs are available as direct replacements. The Spring (P004000890) is a genuine OEM part that provides tension to the slow air screw in the carburetor assembly . The Spring (12435521330) is another OEM metal spring, specifically designed to be secured between the main adjustment screw and the carburetor .
TK Carburetor Rebuild Kits – Complete rebuild kits are available for the TK4 and TK4-RB carburetors used on the B45. These kits include all necessary components, including springs, diaphragms, and gaskets, to restore optimal carburetor function . The high-strength metal springs in these kits work alongside the diaphragms and gaskets to maintain optimal pressure, prevent leaks, and ensure smooth, efficient carburetor operation .
Durable Metal Construction – Carburetor springs are manufactured from high-quality metal with a tension-maintaining design, ensuring durability and long-lasting performance even in harsh mechanical environments . The springs are engineered to maintain consistent tension and pressure for reliable operation.
Technical Specifications
| # | Component | OEM Part Number | Specification / Application |
|---|---|---|---|
| 1 | Spring (Slow Air Screw) | P004000890 | Used in carburetor assembly to provide tension to the slow air screw; fits B45, B45LA, and B45INTL models |
| 2 | Spring (Main Screw) | 12435521330 | Metal spring secured between the main adjustment screw and the carburetor; fits B45 and compatible models |
| 3 | TK Carburetor Rebuild Kit | Various | Includes springs, diaphragms, and gaskets for TK4 and TK4-RB carburetors |
| 4 | Spring | Parts diagram reference | Spring-return component for throttle/carburetor return; listed in B450F carburetor diagram |
| 5 | Adjust Spring | Parts diagram reference | Adjustment spring for carburetor tuning; listed in B450F carburetor diagram |
Products Application
B45 Carburetor Restoration
Direct replacement when the original carburetor spring becomes weak or broken, causing poor engine performance. Replacing a worn spring restores proper tension for precise fuel metering. The P004000890 spring is specifically for the slow air screw, while the 12435521330 spring is for the main adjustment screw.
Carburetor Overhaul with Rebuild Kit
For a comprehensive solution, TK carburetor rebuild kits provide all necessary springs, diaphragms, and gaskets in one package. These kits are designed for the TK4 and TK4-RB carburetor models used on the Shindaiwa B45 brushcutter .
Workshop & Preventative Maintenance
For repair centres servicing Shindaiwa B45 brushcutters, springs are a standard replacement component during carburetor servicing. Genuine OEM springs guarantee correct fitment and reliable operation.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm which carburetor spring fits my Shindaiwa B45?
A:Check your model number on the identification plate and refer to the parts diagram for your specific carburetor assembly. The P004000890 spring fits B45, B45LA, and B45INTL models . The 12435521330 spring is also compatible with the B45 .
Q: What are the symptoms that indicate a carburetor spring needs replacing?
A: Common symptoms include hard starting, erratic idling, hesitation on acceleration, and loss of power. These issues can be caused by weak or broken springs affecting the adjustment screws or metering diaphragm.
Q: Are the carburetor springs included in a rebuild kit?
A: Yes, comprehensive TK carburetor rebuild kits include springs along with diaphragms and gaskets for a complete rebuild solution for TK4 and TK4-RB carburetor models .
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