Echo cs 490 porting

[Red97]

If you don't have a gallon through it don't worry about a tad rich. If ghat coil is anything like the 330T 360t it won't pull much more rpm anyways

Looks like a great time.
Ever get a tach reading on that one sir?

The 330/60t coil should be about 1k higher rpm.

 

[drf256]

Joe,

Which WT did you use for the swap?

It would be nice to know how my ghetto ground out mod stacks up against the amount of craftsmanship you put into your carb.

I really like my saw. I wish I had relieved my cylinder extension as you had, that will keep me wondering if there's still more there.

My saw will be heading up to the CT GTG with me. We will get some opinions on it from the crew that attends.

 

[Red97]

Joe,

Which WT did you use for the swap?

It would be nice to know how my ghetto ground out mod stacks up against the amount of craftsmanship you put into your carb.

I really like my saw. I wish I had relieved my cylinder extension as you had, that will keep me wondering if there's still more there.

My saw will be heading up to the CT GTG with me. We will get some opinions on it from the crew that attends.

I would be surprised if my carb is much better performing than yours.

It is a Wt 6 off of a homelite 240

So if anyone reading this has em, let me know...

And I used the choke plate out of a hda 196.

You can try opening the extension, and piston on the next one. I don't think it hurt my saw at all.

Make sure to get some videos

 

[bikemike]

Looks like a great time.
Ever get a tach reading on that one sir?

The 330/60t coil should be about 1k higher rpm.

No I didn't tach it. Just ran the chit out of it. Think we ran 3 to 4 tanks through it

 

[Red97]

Well the coil was a no go.

Aftermarket one was completely wrong, matched the pic but didn't match the saw it was supposed to be off of.

The 330 coil was mounted 180* off, upside down, wires wouldn't clear. So I swapped the a/m coil onto the 330 laminations, doing so I had to rotate it. Pita swapping the laminate cores.

Got it all mounted on, gapped everything.......


And nothing either I jacked the internals on the coil, while pounding/prying the laminations out. Or I am 180* off time because I had to flip the coil upside down.

When I get some more time, I will pull the key and try 180, if I don't get at least a pop. I'm calling it done.

 

[paragonbuilder]

Well the coil was a no go.

Aftermarket one was completely wrong, matched the pic but didn't match the saw it was supposed to be off of.

The 330 coil was mounted 180* off, upside down, wires wouldn't clear. So I swapped the a/m coil onto the 330 laminations, doing so I had to rotate it. Pita swapping the laminate cores.

Got it all mounted on, gapped everything.......


And nothing either I jacked the internals on the coil, while pounding/prying the laminations out. Or I am 180* off time because I had to flip the coil upside down.

When I get some more time, I will pull the key and try 180, if I don't get at least a pop. I'm calling it done.

Do you have spark?

 

[drf256]

Joe,

You did a great job. I guess the coil aint in the cards.

The gains are solid already.

 

[bikemike]

Well the coil was a no go.

Aftermarket one was completely wrong, matched the pic but didn't match the saw it was supposed to be off of.

The 330 coil was mounted 180* off, upside down, wires wouldn't clear. So I swapped the a/m coil onto the 330 laminations, doing so I had to rotate it. Pita swapping the laminate cores.

Got it all mounted on, gapped everything.......


And nothing either I jacked the internals on the coil, while pounding/prying the laminations out. Or I am 180* off time because I had to flip the coil upside down.

When I get some more time, I will pull the key and try 180, if I don't get at least a pop. I'm calling it done.

Shave ur timing key and run the original coil if you don't like it rotate the key and you got ur stock timing again

 

[Red97]

Do you have spark?

Didn't think to check, I was in a time crunch.

Joe,

You did a great job. I guess the coil aint in the cards.

The gains are solid already.

Thank you.
Still gotta check the spark. If it has spark I'll make it run...

Shave ur timing key and run the original coil if you don't like it rotate the key and you got ur stock timing again

I was just wanting to get an extra 1000 rpm or so out of it. Don't think messing with the timing will gain much. Already pretty far advanced stock.

 

[huskihl]

Well the coil was a no go.

Aftermarket one was completely wrong, matched the pic but didn't match the saw it was supposed to be off of.

The 330 coil was mounted 180* off, upside down, wires wouldn't clear. So I swapped the a/m coil onto the 330 laminations, doing so I had to rotate it. Pita swapping the laminate cores.

Got it all mounted on, gapped everything.......


And nothing either I jacked the internals on the coil, while pounding/prying the laminations out. Or I am 180* off time because I had to flip the coil upside down.

When I get some more time, I will pull the key and try 180, if I don't get at least a pop. I'm calling it done.

I'm not a coil genius by any stretch of the imagination, but like an 084 using 2 different key way slots in the crank, you'd need to change the timing at the perimeter by the distance between centers of the laminated part...sooo...about 2 or 3" retarded or advanced at the perimeter of the flywheel





(I think)

 

[Red97]

I'm not a coil genius by any stretch of the imagination, but like an 084 using 2 different key way slots in the crank, you'd need to change the timing at the perimeter by the distance between centers of the laminated part...sooo...about 2 or 3" retarded or advanced at the perimeter of the flywheel





(I think)

Possibly. First thing I havery to do is check spark. Quite possible something got messed up pounding the laminations out of the coil, or pressing them back in.

I'll go snap some pics in a min, to explain what I did.

 

[Red97]

Coil on the left is the aftermarket 330/360t

Laminations in the middle came in the aftermarket coil

Coil on the right is a used take off 330/360t coil in the stock orientation.

The laminations in the aftermarket coil (left) came out of the "oe" 330/360t coil.

The aftermarket coil, as pictured fits in the saw perfect. But I had to flip it(from the way it was originally) to fit the laminations correctly, to mout in the saw.

This all may be a moot point if I damaged it swapping the laminations.

First thing I need to do is check spark. Then try and get it to the right time. If it has spark I am thinking it is firing around bdc, since I had to flip it 180*

Or it may all just be junk.. lol

 

[drf256]

Joe,

Can we find a coil that unlimited and weld ears on it for mounting in this saw?

 

[Red97]

Joe,

Can we find a coil that unlimited and weld ears on it for mounting in this saw?

Possibly, but I would think the laminations would still need to be removed to be welded on.

I tried grinding the long ear/bolt hole off of the aftermarket coil to fit with just one hole. I couldn't get it to line up at all.

That is when I swapped them. I don't feel I was overly aggressive with removal, but didn't even think about checking spark.

If I don't have to head out for work tomorrow, I will tinker with it a bit more.

 

[David Young]

Coil on the left is the aftermarket 330/360t

Laminations in the middle came in the aftermarket coil

Coil on the right is a used take off 330/360t coil in the stock orientation.

The laminations in the aftermarket coil (left) came out of the "oe" 330/360t coil.

The aftermarket coil, as pictured fits in the saw perfect. But I had to flip it(from the way it was originally) to fit the laminations correctly, to mout in the saw.

This all may be a moot point if I damaged it swapping the laminations.

First thing I need to do is check spark. Then try and get it to the right time. If it has spark I am thinking it is firing around bdc, since I had to flip it 180*

Or it may all just be junk.. lol

Joe I may be wrong but flipping the orientation should not change the firing 180 degrees. It would if you flip the flywheel 180 degrees.
Flipping the coil will change the polarity but timing would remain constant.

If the coil has electronics and auto advance it may not be triggered if the polarity is wrong.


In an standard coil it sees the the increase in the magnetic field 25-30 degrees btdc. Which is transferred to the primary side to fire the plug.

I think to get the variable timing circuit to work the timing needs to be significantly advanced. Say the pulse is around 50-60 btdc and it is delayed for the desired firing rate based on the pulse repetition rate or rpm.

This is my best guess how this works. Does any of this make sense or help.

 

[Red97]

Joe I may be wrong but flipping the orientation should not change the firing 180 degrees. It would if you flip the flywheel 180 degrees.
Flipping the coil will change the polarity but timing would remain constant.

If the coil has electronics and auto advance it may not be triggered if the polarity is wrong.


In an standard coil it sees the the increase in the magnetic field 25-30 degrees btdc. Which is transferred to the primary side to fire the plug.

I think to get the variable timing circuit to work the timing needs to be significantly advanced. Say the pulse is around 50-60 btdc and it is delayed for the desired firing rate based on the pulse repetition rate or rpm.

This is my best guess how this works. Does any of this make sense or help.

It all helps, sooner or later something will click.

All I knew is the laminations needed to be swapped to make it fit the saw.

They can only go in one way, being one leg is larger than the other.

I really can't imagine the aftermarket coil has too much tech in it, but it was the same as the (oe) coil which should have an advance built in.

Only thing I noticed was a strap on the larger leg that made contact with something in the coil don't know what.

Even if it is way out of time it should still throw a spark correct? Should be able to check that at least.

 

[huskihl]

It all helps, sooner or later something will click.

All I knew is the laminations needed to be swapped to make it fit the saw.

They can only go in one way, being one leg is larger than the other.

I really can't imagine the aftermarket coil has too much tech in it, but it was the same as the (oe) coil which should have an advance built in.

Only thing I noticed was a strap on the larger leg that made contact with something in the coil don't know what.

Even if it is way out of time it should still throw a spark correct? Should be able to check that at least.

Timing won't affect whether or not you have spark. Only "when"

 

[Red97]

Timing won't affect whether or not you have spark. Only "when"

Thank you,

That was what I was thinking.

Never messed with a coil before, figured it was worth a shot. They didn't do me much good if they don't fit. So if I screw em up making them fit, chalk it up to the cost of knowledge lol

 

[huskihl]

Timing won't affect whether or not you have spark. Only "when"

Thank you,

That was what I was thinking.

Never messed with a coil before, figured it was worth a shot. They didn't do me much good if they don't fit. So if I screw em up making them fit, chalk it up to the cost of knowledge lol

That right there^^ is about all I know about a coil. That electrical field and magnetism sh!t is witchery. Black magic, I tell you. More so than mike lee's square filing.

 

[wcorey]

With the coil flipped 180, the saw may need to be run backwards to trigger it...