- Genuine part
- OEM number: 0000 998 0604
This small but essential contact spring keeps the spark plug boot making firm electrical contact with the plug terminal, and is a genuine STIHL part fitting an extensive range of disc cutters, brushcutters, hedge trimmers, blowers, pole pruners and earth augers. A worn or corroded spring is a common, easily-missed cause of weak spark or intermittent starting faults.
- Genuine STIHL contact spring - OEM 0000 998 0604
- Maintains a firm electrical connection between the spark plug boot and plug
- Fits an extensive range of STIHL petrol tools across the TS, FS, HS, HL, HT, BR and SH ranges
- Low-cost fix for weak spark or intermittent misfire faults
- Quick, tool-free replacement inside the spark plug boot
Inside every spark plug boot, a small contact spring is what actually makes the electrical connection to the plug terminal - pressing against it firmly enough to deliver a consistent spark even under the vibration of daily use. Over time, and especially on hire fleet or high-hours machines, this spring can weaken, corrode or lose tension, leading to symptoms that are often wrongly diagnosed as ignition module or spark plug faults: intermittent misfiring, difficulty starting, or a spark that comes and goes under load. Because it's such a small, low-cost part, it's frequently overlooked - but replacing it is often all that's needed to restore reliable starting.
This genuine STIHL contact spring (OEM 0000 998 0604) is a shared component across a huge range of STIHL petrol equipment, covering disc cutters, brushcutters, hedge trimmers, pole pruners and blowers. That makes it a genuinely useful part for hire depots and workshops to keep in stock, given how many different machines it can get running again.
Fits:
- TS400, TS410, TS420, TS480i, TS500i, TS700, TS800
- FS87, FS90, FS100, FS130, FS131, FS240, FS360, FS400, FS410, FS450, FS460, FS490
- HS56, HS86
- HL92, HL94, HL95, HL100
- HT101, HT131
- BR350, BR430, BR600
- SH56, SH86
Features and Benefits
- Genuine STIHL part, OEM number 0000 998 0604
- Maintains reliable electrical contact between spark plug boot and plug
- Fits a wide range of STIHL disc cutters, brushcutters, hedge trimmers, pole pruners, blowers and shredder vacs
- Inexpensive, fast-moving consumable worth holding in stock across a hire or workshop fleet
- Simple replacement inside the existing spark plug boot, no special tools required
Top Tips for Diagnosing a Spark Plug Contact Fault
- Intermittent spark or occasional misfiring, especially when the tool is warm or being used hard? Check the contact spring before replacing the ignition module - it's a far cheaper and more common cause.
- If a machine starts fine cold but cuts out or runs rough once warm, a weakened contact spring losing tension under heat and vibration is a frequent culprit.
- Always inspect the spring for corrosion or discolouration when removing a spark plug boot for any other repair - it's an easy add-on fix while the boot is already off.
- This spring is shared across dozens of STIHL models, so it's worth stocking a few as a standard workshop consumable rather than ordering one at a time as faults arise.
- If replacing the spring doesn't resolve a weak spark, move on to checking the ignition module and spark plug itself, in that order, before assuming a bigger fault.
