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The Daily Insight

What is the spark plug gap for a Stihl weedeater

Author

Andrew Mitchell

Published Apr 18, 2026

Gap0.031″ (0.8mm)SeatGasket seatTerminalSolid NutThread Size14mmTypeResistor, Traditional Spark Plug

What should I set my spark plug gap to?

For most racing applications, you usually want the plug gap to be between 0.020 and 0.040 of an inch. Most engine builders seem to settle around 0.035 of an inch. Factors such as the type of ignition you run, cylinder heads, fuel and even timing can affect how much gap will work best for you.

What size are STIHL spark plugs?

Heat Range6Thread Size14mmTipProjected TipTypeResistorReplacesSTIHL 1110 400 7005, 11104007005

What is the spark plug gap on a STIHL fs55r Weedeater?

Unscrew the spark plug and clean it off. Check the electrolode gap on the end of the spark plug, as this gap should be no larger than .5 mm.

What happens if spark plug gap too big?

Excessive spark plug gap results when the voltage has too far to travel. … Excessive plug gap also results in cylinder misfiring, a possible no-start condition, wet, black or fouled plugs, engine hesitation and rough idle. Excessive spark plug gap also happens as result of normal electrode wear and age.

Why does my Stihl trimmer keep cutting out?

A clogged carburetor is most commonly caused by leaving fuel in the string trimmer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.

Is a bigger spark plug gap better?

The larger the gap, the more voltage is needed to jump the gap. Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency.

Why does my trimmer line run out so fast?

If this cap is broken or worn out over time, it can malfunction, causing too much line to feed out when you bump it. Depending on its damage, it could be getting hung up as it tries to return, allowing the line to continuously advance. To replace it, simply remove and replace the bump cap with a new one.

What does FS stand for Stihl?

FS= Freischneider = Line Trimmer.

Are STIHL spark plugs pre gapped?

The union nut (1) of a STIHL spark plug is fixed in place. This ensures there is no spark gap which could impair performance or potentially ignite gasoline fumes.

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What spark plug does a STIHL MS 180 take?

BPM7A NGK Spark Plug Fits Stihl MS650, MS660, MS880, MS170, MS180, 020T, 017, 018, 023, 024, 025, 026, 028, 066, 088 Chainsaw.

What spark plug fits a STIHL MS250?

BPM7A NGK Spark Plug Fits Stihl MS200T, MS210, MS230, MS240, MS250, MS260, MS270, MS280, MS290, MS341, MS361, MS390, MS441, MS460 Chainsaws.

What happens if spark plug gap too small?

If the gap is too small, the spark will easily jump across without too much ionisation so no hot flash. This can mean partial ignition and low power or even another misfire. So spark plugs have a gap recommendation that should be closely followed for reliable, powerful engine function, not too much, not too little.

Does spark plug gap affect idle?

Spark plugs that are gapped incorrectly can cause an engine to miss, or run erratically, especially during idle. The incorrect spark plug gaps can cause uneven firing of individual spark plugs and delay engine combustion; both of which can cause an engine to miss or idle erratically.

Does spark plugs increase horsepower?

In short, yes, in some situations spark plugs can increase horsepower. … These ‘massive’ gains of one or two per cent generally won’t be exceeded, even if you’re replacing really old and worn spark plugs for new ones. In this case, your essentially just restoring your car back to its peak performance.

Is it true that the plugs are pre-gapped from the factory Why?

Spark plugs traditionally leave the factory pre-gapped for their most popular application. However, a plug may fit hundreds of engines, from cars to golf carts. Gapping the plugs to your engine’s specifications is important to prevent pre-ignition, detonation, fouling and poor fuel economy.

How tight should spark plugs be?

Confirm that the thread reach of the spark plug is the right one for your engine. … Tighten the spark plug finger-tight until the gasket reaches the cylinder head, then tighten about ½ – ⅔ turn more with a spark plug wrench.

How do you adjust the high and low on a Stihl weedeater?

Start the trimmer and hold the throttle trigger in all the way to get the trimmer head spinning at maximum speed. Turn the H screw clockwise with a carburetor adjustment tool until the head is spinning as fast as it will go, then back off the screw carefully until the RPMs start to decrease.

What does the R stand for on STIHL weedeater?

To help you identify model features, look for these corresponding symbols: C = Comfort feature, E = Easy2Start™, R = loop handle, and X = lightweight version. STIHL professional grass trimmers also boast an exceptional power-to-weight ratio, putting every last ounce of their well-balanced construction to work.

What does R stand for in STIHL?

R = STIHL RAPID™

How much string does a STIHL weedeater need?

Most of Stihl’s trimmer heads take 0.095-inch microfilament line, but you can use heavy-duty 0.105-inch line with the TrimCut and some versions of the AutoCut head. The AutoCut-C head requires 0.080-inch line.

How do I stop my Weedeater string from breaking?

Bumping the trimmer too often may release excess string and cause it to snap. Trim only areas that are free from debris and foreign objects, advises Greenpal. When weedeater nylon comes into constant contact with hard objects, it’s more likely to break from bumping up against the resistance.

How do I keep my trimmer line from breaking?

Answer: If the trimmer auto feeds, it’s possible that the mechanism is faulty and letting the line out too quickly. The cutter on the trimmer guard should cut the line in any case. Try winding the line a bit tighter and neater on the spool because if it’s loose, it will feed out too much.

Why does the line on my grass trimmer keep breaking?

The most frequent cause of a line breakage is through contact with something in the garden. Usually this is the result of the cutting head being taken too close to objects, e.g. garden stones, paving edges, walls etc.

What spark plug does a Stihl MS170 take?

5 x NGK SPARK PLUGS – STIHL MS170 MS180 – BPMR7A | ZPN-24117 | OnlineAutoParts.

What spark plug does a Stihl 025 take?

Spark Plug For Stihl 023 025 026 024 MS230 MS250 MS240 MS260 MS361 Husqvarna 51 55 61 268 272 272XP 340 345 346XP 350 Chainsaw, NGK BMP7A L7TC Spark Plug For Many Stihl Husqvarna Echo and other Machines OEM# 1110 400 7005. Parts Name: Spark Plug.

What spark plug does a Stihl MS170 use?

Stihl 0000-400-7000 Replacement Spark Plug For Stihl MS170 Chainsaw BPMR7A – ME Campbell Co.

What spark plug does Stihl blower use?

If you bought your blower used, it might contain the wrong spark plug. Stihl specifications call for either an NGK BPMA 7A or a Bosch WSR 6F spark plug. If you change plugs, make sure the boot on top of the plug fits snugly into place.

What kind of spark plug does a chainsaw use?

NGK spark plug fits many chainsaws and cut off saws.

What spark plug does a Stihl 026 use?

NEW Genuine NGK Spark Plug BPMR7A 2-Pack STIHL 026 028 MS250 MS290 MS310 MS390 | eBay.

How many cc is a Stihl 025 chainsaw?

The Stihl 025 is a 45cc, 3hp chainsaw that weighs in at 10.4 lbs.