Makita EA4300F ignition coil failure?

[Wilhelm]

Impulse line collapsing or leaking when going WOT?

Never mind me, just thinking out loud.
I am "green" with this saw model and have issues on mine that need remedied.

 

[NPKenny]

How annoying.

I recently rebuilt a Makita 7910, full teardown, Poleman carb, etc... It has the exact same symptoms as described in this little version. I honestly didn't consider the coil as a culprit. It's been sitting for a year. Annoying is a reasonable word.

I also have an EA4300 in red. These are such nice saws. It is a shame that parts are expensive and scarce. I have a blue 42cc that is ready for a rebuild as well.

 

[Shane¹]

I recently rebuilt a Makita 7910, full teardown, Poleman carb, etc... It has the exact same symptoms as described in this little version. I honestly didn't consider the coil as a culprit. It's been sitting for a year. Annoying is a reasonable word.

I also have an EA4300 in red. These are such nice saws. It is a shame that parts are expensive and scarce. I have a blue 42cc that is ready for a rebuild as well.

Just throw a 272 coil on that 7910 pretty easy and super cheap

 

[stretch5881]

I have not had the best luck with AM coils. Seems one out of three will work the way its supposed to. OE coils jumped drastically in price. The last few I replaced, I found good used ones.

 

[Steve]

I have not had the best luck with AM coils. Seems one out of three will work the way its supposed to. OE coils jumped drastically in price. The last few I replaced, I found good used ones.

I agree 100%. Haven't had good luck with aftermarket coils either but as a diagnostic dart, I'd waste 27 bucks before another 85.

 

[Steve]

Oh yeah!!! With a name like that it has to be better than OE!!

Stay tuned!

 

[Shane¹]

Oh yeah!!! With a name like that it has to be better than OE!!

Stay tuned!

View attachment 354186

Sounds "wicked" fast

 

[Steve]

Ok so had to fix some quality issues (no way, right?) because the I could not get the lamination from hitting the flywheel. The laminations where not all the same level so a quick sanding with a Dremel and a sanding drum trued it up. Too much epoxy on top of the coil would not allow the bolt head and the nylon isolator to go far enough in the groove before bottoming out. Utility knife fixed that .

 

[Steve]

And by golly, coil fixed it!! I'll put it in some wood tomorrow.

 

[drf256]

Interesting. Thanks for sharing.

 

[00wyk]

Yeah, since that coil mounts directly to the cylinder, it gets heat cycled every time you whip her out. Although that huge flywheel does it's best to cool her off, I dunno if the location was such a good idea.

 

[Steve]

Yeah, since that coil mounts directly to the cylinder, it gets heat cycled every time you whip her out. Although that huge flywheel does it's best to cool her off, I dunno if the location was such a good idea.

Where you been Wes? Haven't seen you around much. Hope all ok out your way.

 

[00wyk]

Where you been Wes? Haven't seen you around much. Hope all ok out your way.

Not a whole lotta chainsaw stuff happening in my life recently, really. Only the occasional porting, repair and wind blown stuff.
Though with the prices of new equipment and availability like they are, I am getting more busy. You?

 

[Steve]

Not a whole lotta chainsaw stuff happening in my life recently, really. Only the occasional porting, repair and wind blown stuff.
Though with the prices of new equipment and availability like they are, I am getting more busy. You?

I too think chainsaws are dumb. Lol! I mainly hang out in the off topic section anymore with the gang.

 

[Gizzard]

I was betting on the coil. Glad you got somewhere. That 420 that had was a gremlin. Replaced to many parts on it. When last repair was coil it was sent down the road. Coil fixed the 420 too.

 

[Gizzard]

Recently bought a infrared temp gun to put on my forehead when dealing with this new stuff everyone brags on.

 

[Skisawyer]

Great saw though, worth fixing. Puts a big grin on my face every time I put it to wood.

 

[ajschainsaws]

And by golly, coil fixed it!! I'll put it in some wood tomorrow.


View attachment 354194

great news all fixed up

 

[ajschainsaws]

Yeah, since that coil mounts directly to the cylinder, it gets heat cycled every time you whip her out. Although that huge flywheel does it's best to cool her off, I dunno if the location was such a good idea.

I must have got a hybrid flywheel on my blue one

 

[00wyk]

I must have got a hybrid flywheel on my blue one

You still carrying Dolmar and makita?