Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Chainsaws not listed - Gas OPE => Topic started by: Al Smith on August 18, 2014, 07:31:36 pm

Title: Echo GT 1100 coil .
Post by: Al Smith on August 18, 2014, 07:31:36 pm
I thought it was bad so I flea bayed one and I thought it was bad too.Wrong the freakin magnets went weak in the flywheel .In all the stuff I've ever fiddled with that's the first I ever saw that .

So I got a couple strong magnets and remagnitized to two outside magnets and it fired right up .In rotation it goes south-north -south .One for the books there  ,wow.Now I wonder why in the world they lost their retentivity ????
Title: Re: Echo GT 1100 coil .
Post by: Al Smith on August 18, 2014, 07:38:17 pm
I've been on a weed wacker and blower kick here of late .In addition to a brand new Stihl with less than two tanks of fuel through it I must have 6-8 others .There are like stray cats ,they just arrive .Same with the blowers .So far in the last week I've got 4 running ,gave one away .

The Echo tonight and a 31 cc Ryobe yesterday which has a reed valve intake .Talk about power for a trimmer .
Title: Re: Echo GT 1100 coil .
Post by: Cut4fun . on August 18, 2014, 07:58:41 pm
I thought it was bad so I flea bayed one and I thought it was bad too.Wrong the freakin magnets went weak in the flywheel .In all the stuff I've ever fiddled with that's the first I ever saw that .

So I got a couple strong magnets and remagnitized to two outside magnets and it fired right up .In rotation it goes south-north -south .One for the books there  ,wow.Now I wonder why in the world they lost their retentivity ????

Didnt know you could remagnitize flywheel magnets . 

Hope I dont have to ever hit you up for the info on this myself.   Good to know it's possible.
Title: Re: Echo GT 1100 coil .
Post by: Al Smith on August 18, 2014, 08:55:58 pm
Funny thing is if you surf the net the so called experts say you can't .I didn't know if it would work or not .

Just stack up a bunch of magnets so they multply in strength and kind of stroke the dead magnets with the right polarity .

Fact right after I made that first post I fired it up and cut some weeds .Wow before too long I'll have a chainsaw for every day in the month,a blower for every week and a weedwacker for every day of the week ,wow . ;D
Title: Re: Echo GT 1100 coil .
Post by: aclarke on August 18, 2014, 10:22:24 pm
Al,
There used to be some old Briggs Stratton literature floating around the net on how to build an electromagnet flywheel "recharger" on the net.
Title: Re: Echo GT 1100 coil .
Post by: Al Smith on August 18, 2014, 10:38:06 pm
They used to charge the magnets on things like Wico magnetos on old tractors .It was just a coil and a battery .

It was just a stab in the dark for me .I figured the magnets were soft iron which have a high degree of permanabilty so it wouldn't take much to rejuvenate them .Worked ---so far . ;D

I did however set the air gap tight ,like 3 thou instead of the normal 8 to 12 thou .
Title: Re: Echo GT 1100 coil .
Post by: aclarke on August 19, 2014, 01:10:35 am
Al,
I have a bad 3120xp flywheel, I'll give it a try.... im thinking someone with a hammer ruined the magnetism!  Lol
Title: Re: Echo GT 1100 coil .
Post by: Al Smith on August 19, 2014, 09:03:22 am
I'm not certain weather a thump from a hammer screws them up or not .

The only thing I can think of and it's far fetched is if they got stopped near top dead center where the either the charge circuit or the impulse circuit were sitting over two magnets .On a high compression 3120 I'd think that would only be possible if the decomp were pulled .Wouldn't be hard though on a 23 cc weed wacker.

My wild guess is in the case you could in theory have a magnetic path through the coil lamenations.However due to the lamenations which prevent permanabilty of the core you could not permantley magnitize the core .It's just a great mystery .
Title: Re: Echo GT 1100 coil .
Post by: Nathaniel Vansickle on November 20, 2014, 09:03:44 pm
Late to the party but had same thing happen on echo gt200 trimmer about a month ago. We replaced the flywheel. If I ever run into this again and remember I will give this a try