MS400C Won't Start

[Mastermind]

I got this put back together and it still will not run. It does pop off but doesn't fire up and run. It seems like it isn't getting adequate fuel. I checked the impulse passage, fuel line, etc. again when I had it apart and didn't see any issues.

I am running out of ideas. Both carbs and both coils do the same thing basically, so it doesn't seem to be either of those.

Have you pressure tested the saw?

 

[lehman live edge slab]

I got this put back together and it still will not run. It does pop off but doesn't fire up and run. It seems like it isn't getting adequate fuel. I checked the impulse passage, fuel line, etc. again when I had it apart and didn't see any issues.

I am running out of ideas. Both carbs and both coils do the same thing basically, so it doesn't seem to be either of those.

Check continuity on the harness with a meter and make sure connections are good

 

[benmyers]

Hey guys. I realized I never updated this. Got the saw going.

Initially it’d spark but only if I yanked it really hard. Did the same with a new OEM ignition module.

Turns out the old one was bad but the brand new one was also bad. Stihl warrantied it and replaced it. Started right up.

I guess the moral of the story is that it can happen. Brand new part was bad right out of the box. No testing I could do with a multimeter indicated either should be “bad”. I’d like to compare the one that works with the original and try to learn what’s different or if I could confirm with a meter that it’s bad.

Ben

 

[lehman live edge slab]

Hey guys. I realized I never updated this. Got the saw going.

Initially it’d spark but only if I yanked it really hard. Did the same with a new OEM ignition module.

Turns out the old one was bad but the brand new one was also bad. Stihl warrantied it and replaced it. Started right up.

I guess the moral of the story is that it can happen. Brand new part was bad right out of the box. No testing I could do with a multimeter indicated either should be “bad”. I’d like to compare the one that works with the original and try to learn what’s different or if I could confirm with a meter that it’s bad.

Ben

Even Stihl will say no real way to test with a meter to see good or bad, not sure my mdg1 would even be able to give you a definitive answer when it does a spark test if it’s putting some out.

 

[bogieboy]

I d

Even Stihl will say no real way to test with a meter to see good or bad, not sure my mdg1 would even be able to give you a definitive answer when it does a spark test if it’s putting some out.

I believe the MDG is the only way to check spark with the stihl mtronic coils, one of the tests in the SDS is a coil function test.

 

[lehman live edge slab]

I d

I believe the MDG is the only way to check spark with the stihl mtronic coils, one of the tests in the SDS is a coil function test.

This is true and I have the mdg1 but I’m not 100% it isn’t just testing for output like you would with a spark tester not actually reading values of weak or good.

 

[bogieboy]

This is true and I have the mdg1 but I’m not 100% it isn’t just testing for output like you would with a spark tester not actually reading values of weak or good.

If memory serve correct (its been a few months since i had the mdg out) it uses the software to trigger the coil thru the wiring harness somehow, and reads the apparent voltage on the coil secondary if/when it fires

 

[wiwalker06]

My 400C ate a coil when it was pretty new. Perhaps Stihl has a coil durability issue?

 

[mainer_in_ak]

Wow, that's a total bummer. I'm glad Stihl squared up with u. If it craps out a 3rd time, at half the price, there's plenty of other 65-67 cc saws that oil better and equipped with simple walbro carbs that take 10 minutes and $12 to rebuild. The 1 lb difference means nothing.

Dang that's crazy, overpriced parts that are stihl-born right out of the box.

 

[bogieboy]

My 400C ate a coil when it was pretty new. Perhaps Stihl has a coil durability issue?

They never did, but recently seeing a rash of failed coils....

 

[lehman live edge slab]

Wow, that's a total bummer. I'm glad Stihl squared up with u. If it craps out a 3rd time, at half the price, there's plenty of other 65-67 cc saws that oil better and equipped with simple walbro carbs that take 10 minutes and $12 to rebuild. The 1 lb difference means nothing.

Dang that's crazy, overpriced parts that are stihl-born right out of the box.

What are you talking about a Stihl coil isn’t all that much different in price than a 562 and no more failure prone than they are. I fact Stihl and husky have many times used the same ignition manufacturers over the years. Not currently but they have many times like Bosch and sem.

 

[mainer_in_ak]

What am I talking about?

Hint #1: the cutting world doesn't revolve around just 2 brands.

Hint #2:
I've made thousands of dollars in extra income off my fleet of affordable 60-67 cc saws, and I've yet to experience an ignition coil failure.

Hint #3:
These 60-67 cc saws will over oil a 28" bar

Hint #4:
They begin with an "E" and end in "O" fk yea

Hint #5:
Their commercials are juvenile and retarded

Now, a few questions for you:
We built this city, we built this city on rock and roll. Dont u remember listening to the radio?

What if God was one of us? Just a stranger on a bus, trying to make his way home?

Who needs a heart when a heart can be broken?

 

[Sloughfoot]

What am I talking about?

Hint #1: the cutting world doesn't revolve around just 2 brands.

Hint #2:
I've made thousands of dollars in extra income off my fleet of affordable 60-67 cc saws, and I've yet to experience an ignition coil failure.

Hint #3:
These 60-67 cc saws will over oil a 28" bar

Hint #4:
They begin with an "E" and end in "O" fk yea

Hint #5:
Their commercials are juvenile and retarded

Now, a few questions for you:
We built this city, we built this city on rock and roll. Dont u remember listening to the radio?

What if God was one of us? Just a stranger on a bus, trying to make his way home?

Who needs a heart when a heart can be broken?

I was pondering the "r word" moments before I opened this thread.
Strange.

 

[lehman live edge slab]

What am I talking about?

Hint #1: the cutting world doesn't revolve around just 2 brands.

Hint #2:
I've made thousands of dollars in extra income off my fleet of affordable 60-67 cc saws, and I've yet to experience an ignition coil failure.

Hint #3:
These 60-67 cc saws will over oil a 28" bar

Hint #4:
They begin with an "E" and end in "O" fk yea

Hint #5:
Their commercials are juvenile and retarded

Now, a few questions for you:
We built this city, we built this city on rock and roll. Dont u remember listening to the radio?

What if God was one of us? Just a stranger on a bus, trying to make his way home?

Who needs a heart when a heart can be broken?

Never said echo was bad hell they may even use the same ignition suppliers as the big companies. They make good saws and so did dolmar but to say they’re better than Stihl or husky may be a stretch is all. 7310 is a nice durable saw but heavy and down on power, seems to me I’ve read that echo is going to have to come up with more technology to meet emissions soon so they’ll be with everyone else. They already came back out with the shindiawa hybrid engine for the back pack blowers. Plenty of old cheap stihls and husky that can still make money if a solenoid on the side of a carburetor is too much technology. By the way shindiawa and that overpriced company worked together on several occasions including that hybrid 4/stihl 4-mix.

 

[bogieboy]

I was pondering the "r word" moments before I opened this thread.
Strange.

Youmean..... Redmax.....right?

 

[wiwalker06]

What am I talking about?

Hint #1: the cutting world doesn't revolve around just 2 brands.

Hint #2:
I've made thousands of dollars in extra income off my fleet of affordable 60-67 cc saws, and I've yet to experience an ignition coil failure.

Hint #3:
These 60-67 cc saws will over oil a 28" bar

Hint #4:
They begin with an "E" and end in "O" fk yea

Hint #5:
Their commercials are juvenile and retarded

Now, a few questions for you:
We built this city, we built this city on rock and roll. Dont u remember listening to the radio?

What if God was one of us? Just a stranger on a bus, trying to make his way home?

Who needs a heart when a heart can be broken?

For all intents and purposes for most of the country it does revolve around two brands and in some cases one. None of which are Echo.
Not that Echo makes a bad product. They just sell relatively few of them and they are old tech and have lower performance in several different parameters.

 

[mainer_in_ak]

For all intents and purposes for most of the country it does revolve around two brands and in some cases one. None of which are Echo.

How could you be so gawd dmn inclusive, to completely forget about Hnsavrqua!?

 

[wiwalker06]

Never said echo was bad hell they may even use the same ignition suppliers as the big companies. They make good saws and so did dolmar but to say they’re better than Stihl or husky may be a stretch is all. 7310 is a nice durable saw but heavy and down on power, seems to me I’ve read that echo is going to have to come up with more technology to meet emissions soon so they’ll be with everyone else. They already came back out with the shindiawa hybrid engine for the back pack blowers. Plenty of old cheap stihls and husky that can still make money if a solenoid on the side of a carburetor is too much technology. By the way shindiawa and that overpriced company worked together on several occasions including that hybrid 4/stihl 4-mix.

Are you sure Shindaiwa worked with Stihl. First, I have heard that. The wo designs are really completely different.

 

[benmyers]

Thanks for the replies. Both of the "bad" coils would spark (strong blue), but only when you yanked it really hard. Consequently, it would only pop once and never take off.

This one isn't even my saw, although I do like how easily it starts and they do run strong.

For 70cc I have a 460 magnum and also a Jonsered 2172. My all time favorite in this class is probably the 372/2172. For me they have been near bulletproof. I have nothing against the other brands.

 

[pwheel]

As MM suggested, a pressure/vac test is warranted .