Product Parameters
| Specification Item | Description |
|---|---|
| Compatible Models | Stihl MS661, MS661C, MS661 C-M, MS651 |
| Replaces OEM No. | 1144 790 9100 |
| Component Type | Front hand guard / Chain brake handle |
| Primary Function | Chain brake activation & hand protection |
| Available Options | OEM genuine & aftermarket |
| Material | Reinforced plastic (aftermarket); OEM-spec polymer |
| Installation | Direct replacement requiring basic tools |
Product Description
Product Details
1. Dual Safety Function
Serves a dual purpose: protecting the operator's left hand from contact with the saw chain and providing a manual mechanism to engage the chain brake in an emergency or kickback situation .
2. Inertia-Activated Brake Mechanism
The hand guard is engineered to trigger the chain brake by inertia during kickback events. If the forces are high enough, the guard accelerates toward the bar nose to stop the chain, even if the operator's hand is not behind it .
3. Direct OEM Replacement
Manufactured to replace the Stihl original part number 1144 790 9100, ensuring a proper fit and maintaining the correct braking function. Aftermarket options provide an affordable alternative without the OEM price tag .
Products Package
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FAQ
Q1: How do I check if my chain brake hand guard is working?
A: Run the engine at idle speed, engage the brake by pushing the hand guard forward, then briefly accelerate to full throttle for no more than 3 seconds.
Q2: How often should the chain brake be maintained?
A: Regular servicing is essential as the brake is subject to wear. Stihl recommends maintenance intervals based on usage: every 3 months for full-time professional use, every 6 months for part-time use, and every 12 months for occasional users .
Q3: Can I install this hand guard myself?
A: Yes, the hand guard is a direct-fit replacement designed for easy installation. In many cases, it can be replaced with just a few screws and does not require special tools, though familiarity with the assembly sequence (including cam lever and spring alignment) is helpful.
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