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Sthil FS55R not running.

#1

Hottech

Hottech

After discovering that there was no visible spark I replaced the coil and had a very strong and clear spark it still would not run. Replaced the carburetor, fuel filter, air filter and fuel tank just for good matters it still would not run. Confused and discussed I dropped it off at a Sthil dealership for the knowledge of knowing where I went wrong. The dealership had a 5 week wait for repairs but I felt that it would be in my garage for at least that length of time not being fixed. After 5 weeks I was told by the mechanic that it could not be fixed and the sales rep was trying to convince me to buy a new one. I was certain that anything mechanical could be fixed and google searched this forum. Could not find what I was looking for but was given the Sthil 1-800 # and connected to the technical help line. The tech immediately diagnosed that I had a bad coil and that the timing of the coil was off. Even though I had a good spark it was at the wrong interval. Who would have imagined that the small black coil was programed for timing. Replace the coil and it fired up like brand new. A lesson learned don't give up just because you though the dealership was an expert. A very happy camper and glad to have my Sthil trimmer working again.


#2

Fish

Fish

So the original coil was bad, and the first replacement the incorrect one?
For what it is worth, their fs38 is the same powerhead, and the whole thing sells for $129 new.


#3

Hammermechanicman

Hammermechanicman

Was the coil OEM or aftermarket? I have had folks buy Ebay and amazon coils for stihls that look and fit the same as the OEM coil but the timing is wrong.


#4

B

bertsmobile1

Could not find what I was looking for but was given the Sthil 1-800 # and connected to the technical help line. The tech immediately diagnosed that I had a bad coil and that the timing of the coil was off. Even though I had a good spark it was at the wrong interval. Who would have imagined that the small black coil was programed for timing. Replace the coil and it fired up like brand new. A lesson learned don't give up just because you though the dealership was an expert. A very happy camper and glad to have my Sthil trimmer working again.
Every one who repairs small engines and every mechanic trained since 1901 knows how a Kettering ignition works.
Every one who was not asleep during their science classes would know how coil works .

Glad you got it fixed.
For future reference when you have fuel compression & spark but no bangs, the next thing to do is check the timing ( roughly ) by locating the position of the piston and comparing it to the position of the magnet & coil legs .
Occasionally when really stumped I have put a white line down one of the coil lamination legs & onto the flywheel then hook up a strobe light & spin the engine with a power drill to see where the sparks were happening with respect to the piston position.
FWIW should be some where around 30 deg before TDC.
Been caught out with wrong coils more than once


#5

Hammermechanicman

Hammermechanicman

My father who was born in 1911 used to joke that charles Kettering was a terrible person. When folks asked why he thought that he would say it was because he invented the electric car starter. Then folks would ask why that was a bad thing and he would say that before the electric starter women couldn't drive cars.
Da dum tss.
Living near Dayton Ohio the kettering name is still very prominent.
City of kettering
Kettering hospital
Kettering foundation
Kettering health network
Kettering labs


#6

B

bertsmobile1

My father who was born in 1911 used to joke that charles Kettering was a terrible person. When folks asked why he thought that he would say it was because he invented the electric car starter. Then folks would ask why that was a bad thing and he would say that before the electric starter women couldn't drive cars.
Da dum tss.
Living near Dayton Ohio the kettering name is still very prominent.
City of kettering
Kettering hospital
Kettering foundation
Kettering health network
Kettering labs
Hammer you just made my day
Also learned some thing because I always thought Kettering was an Irish man ( I will of course check )


#7

Hammermechanicman

Hammermechanicman

He did most of his inventing in dayton ohio. They have some interesting displays of his and the wright brothers in the Dayton Engineers Club. He founded Delco. (Dayton Electric Company). He invented the electric cach register while working for NCR. He also partnered with the wright brothers when they started their airplane company.


#8

S

slomo

He did most of his inventing in dayton ohio. They have some interesting displays of his and the wright brothers in the Dayton Engineers Club. He founded Delco. (Dayton Electric Company). He invented the electric cach register while working for NCR. He also partnered with the wright brothers when they started their airplane company.
Imagine people like this, going to school on dirt floors. And today we (USA) have the poorest edu'macation standards in the world. Pouring millions into schools and such. They did it on a peanut budget.

slomo


#9

StarTech

StarTech

He did most of his inventing in dayton ohio. They have some interesting displays of his and the wright brothers in the Dayton Engineers Club. He founded Delco. (Dayton Electric Company). He invented the electric cach register while working for NCR. He also partnered with the wright brothers when they started their airplane company.
Never heard of a "cach register" and I worked on a lot of cash registers

What is cach register?
Imagine people like this, going to school on dirt floors. And today we (USA) have the poorest edu'macation standards in the world. Pouring millions into schools and such. They did it on a peanut budget.

slomo
Schools tend just run the students through like cattle. For me English was one of my poorest subjects until I went to 6 weeks of Summer school after the 10th grade. I went from failing it to "A's". Just takes teachers that care about teaching instead just drawing a pay check. Of course having only an hour to deal with 50 students at a time is hard too. Now for me nearly failing History is my fault as I hated it. One of my History teachers just couldn't understand why I barely pass it and but had A+ in electronics.


#10

Hammermechanicman

Hammermechanicman

Yeah , cash register. My thumbs and phone keyboard not the best combination.


#11

T

Telesis

With today's push for electric vehicles, what I find interesting is that prior to 1908 when Ford introduced the inexpensive model T, more than half the cars on the road were electric! The model T was less than half the price of the average electric at the time and when Kettering's starter was introduced on the Cadillac in 1912 and others shortly after, that, and John D Rockefeller's Standard Oil Co. pretty much tanked EV development.


#12

B

bertsmobile1

With today's push for electric vehicles, what I find interesting is that prior to 1908 when Ford introduced the inexpensive model T, more than half the cars on the road were electric! The model T was less than half the price of the average electric at the time and when Kettering's starter was introduced on the Cadillac in 1912 and others shortly after, that, and John D Rockefeller's Standard Oil Co. pretty much tanked EV development.
Batteries are what tanked electric car development and are what has choked it ever since.
You just can not get the energy density needed to power a car over a useful distance.
So it was fine in the 1900's when the rich ( you had to be rich to own an electric car ) were using cars to replace their horses
And remember 20 miles was a long ride on a horse and 40 miles a full days travel in a coach .
Ever wondered why roads had villages every 30 miles or so ?
Because that was a coach travel distance apart, 1/2 day for galloping horses & a full day for a trotter.
Look at the battery pack under the seat of a golf buggy.
It was Lithium batteries that made electric cars viable , and not conspiracy from oil companies .
It is also lithium batteries makes electric cars an environmental disaster.

Ford proved that what the market wants is cheap first and reliability last
As such a cheap lead acid battery was never going to be replaced because they are very cheap to make and still the only part of a car that is both completely recycleable and profitable to do so .
I was in recycling in the 70's during the energy crisis when car companies were being pushed for better mileage and that is what caused the next leap in battery technology from rubber cases to HDPE cases and plates that were 2mm thick to PbAg plates that are 0.5mm thick which cut the weight of the battery by 2/3


#13

J

Joed756

Imagine people like this, going to school on dirt floors. And today we (USA) have the poorest edu'macation standards in the world. Pouring millions into schools and such. They did it on a peanut budget.

slomo
We are still graduating geniuses, we just don't seem to recognize them as we do bygone geniuses. Bill Gates, Elon Musk, Jeff Bezos, Steve Jobs and many more.


#14

Fish

Fish

Evil geniuses perhaps.


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