Spark

[Fish]

Folks test and see a spark, so they say that the spark is good...........

They say it shocked their pinky, so the spark is good.

They go by spark color, but that is quite subjective...........

Lot's of spark questions today, I thought I would just throw this out there....

Favio is a Daddy, he is not shootin blanks, and he gave me this cute little hand rolled cigarillo...... So I am quite reflective.........

Running problems are tough to isolate, that is why I make the real big bucks.........................................................................................................................................................................................................................................................................................

 

[Guarddog1]

I have seen spark that appeared good but when it was apposed by the pressure of compression there was not enough energy to make it jump the gap. Try diagnosing that puppy. (But again that is why fish makes the big money.
Just joking fish do not take offense.)

 

[Fish]

No problem, as I always take offense.......

My wife has been testing my ability to handle pressure, I am losing that
test....

 

[motomedik]

The method I use to test for good spark is with a gap of around 8mm but thats for a motorcycle. Maybe my test gap wouldn't be so large for a saw.

 

[mweba]

Amazes me how many people try changing the spark plug last or never for that matter.
Had no spark on the 028 day before the GTG, threw a kawasaki electronic ignition trigger on it and away I went.

 

[Guarddog1]

The method I use to test for good spark is with a gap of around 8mm but thats for a motorcycle. Maybe my test gap wouldn't be so large for a saw.

One time I inadvertently checked the spark on my YZ I was taking the plug out and my brother kicked it over while I had my hand on the wire and HOLY CRAP they give out A LOT of volts and FFAASSTT. That was a heck of a learning experience I believe it was more volts that and vehicle.

 

[motomedik]

One time I inadvertently checked the spark on my YZ I was taking the plug out and my brother kicked it over while I had my hand on the wire and HOLY CRAP they give out A LOT of volts and FFAASSTT. That was a heck of a learning experience I believe it was more volts that and vehicle.

That's one way to check the spark intensity!

 

[J.W Younger]

Intresting thread. I just checked my owners manual for the 5100 and the recommended spark plugs had an R in the number. Thats a resistor plug I'm thinkin. Why in hell does a chainsaw need a resistor in the plug?
must be somea that gubberment mandated ####.

 

[heimannm]

I was checking out my SIL's little Stihl before the GTG Saturday morning. We had it running about two years ago but it had been setting in his garage since then. Tried to start it and nothing. Pulled the spark plug and no spark. Of course I decided it must be something serious deep inside, but my brother suggested trying a different spark plug; fat, blue, snapping spark, and the saw was ready to go.

This has happened to me once or twice before. I can't quite understand how this happens to a saw that is just setting around but spark plugs are cheap, and struggling with a saw for an hour or two only to find out the spark plug was the problem is annoying.

Of course you can struggle for a long time on an old gear drive saw only to discover you were spinning it backwards (with the recoil started off of course).

Mark

 

[Rookie1]

I dont know the reason but Ive been told resistor plugs make 4 cycle mowertype engines start easier. I would assume it carries over to 2 strokes.As for testing spark I use an inline tester. One that lights up,After a while you can tell the difference between good an weak spark.
Oh Fish, Dont all wives test husbands for their ability to handle pressure?

 

[J.W Younger]

I dont know the reason but Ive been told resistor plugs make 4 cycle mowertype engines start easier. I would assume it carries over to 2 strokes.As for testing spark I use an inline tester. One that lights up,After a while you can tell the difference between good an weak spark.
Oh Fish, Dont all wives test husbands for their ability to handle pressure?

wonder how that works. a resistor requires more electrical pressure(voltage)
for a given amperage
1volt to push one amp tru a resistance of 1 olm........last time I checked.

olms law not mine

 

[Rookie1]

The salesman at the parts store said hes sold resistor plugs to people who have hard starting mowers and that made them start easier. I dont know?

 

[eyolf]

These cheesy little magnetos on small engines just don't have a whole lot of power. Resistance in the plug holds the spark back for part of a nano, until it fires with everything its got.

Think 7th grade and a spitwad in a soda straw. Put a loose-fitting spitball in the straw and blow: the spitwad flops out slowly and doesn't go far. Then make a bigger one that fits the straw; now you gotta blow harder, but once it goes you can make it all the across the hall and land on the window next to Mrs. Woodes' desk.

Undetected, if you're careful...and Alex S. gets the blame!

Not that I'd actually know, of course....

 

[dragrcr]

when i was in school (auto tech) in arizona, we were in a performence class, and in the middle of a dyno run, i went to advance the timming ever so slightly, the motor has a MSD digital 10 system with 2 coils... i sat on the floor for probably 10 minutes before i got my marbles back into place enough to get up.... damn worn out spark plug wire boots!

 

[Elmore]

Resister Plugs

Intresting thread. I just checked my owners manual for the 5100 and the recommended spark plugs had an R in the number. Thats a resistor plug I'm thinkin. Why in hell does a chainsaw need a resistor in the plug?
must be somea that gubberment mandated ####.

They call for resistor plugs on newer equipment because a non-resistor plug may interfere with electronic ignitions...also they mess with your AM radio reception!

 

[J.W Younger]

They call for resister plugs on newer equipment because a non-resister plug may interfere with electronic ignitions...also they mess with your AM radio reception!

yeah, this is for sure one of the reasons, LOL.
but there may be something to rookies theory also, think about a water hose with a nozzle on the end. I think rookies thinkin would difinently help with a wide plug gap but most saws have a narrow gap like.025 or closer.This is the kinda stuff that makes us think
now my head hurts.

 

[john taliaferro]

msd

stop your hart,you get dizzy,then thump thump she starts yep you just slid in by the skin on your teeth. the car was not running the key was on and i was twisting dist. i bet some of these new saws could hurt you bad.

 

[rbmopar]

Of course you can struggle for a long time on an old gear drive saw only to discover you were spinning it backwards (with the recoil started off of course).

At least I'm not the only one who has done this.

 

[056kid]

Folks test and see a spark, so they say that the spark is good...........

They say it shocked their pinky, so the spark is good.

They go by spark color, but that is quite subjective...........

Lot's of spark questions today, I thought I would just throw this out there....

Favio is a Daddy, he is not shootin blanks, and he gave me this cute little hand rolled cigarillo...... So I am quite reflective.........

Running problems are tough to isolate, that is why I make the real big bucks.........................................................................................................................................................................................................................................................................................

Wtf.


are you a fruit loop?

 

[056kid]

yeah, this is for sure one of the reasons, LOL.
but there may be something to rookies theory also, think about a water hose with a nozzle on the end. I think rookies thinkin would difinently help with a wide plug gap but most saws have a narrow gap like.025 or closer.This is the kinda stuff that makes us think
now my head hurts.

Wide gaps are for 4 strokes.


my 250r will ##### & moan all day long with anything over .025...