7900 coil swap

[WKEND LUMBERJAK]

I know there is a thread over in hell on swapping a husky coil to the 7900 is it the 272? also has any one here done . and pointers. getting ready to up grade a 6401 to a 7910 and figured I might as well do the whole thing .

 

[Mastermind]

We have had some discussions about doing that Kenneth. I don't think we have a thread dedicated to it though.

@mdavlee

@Hedgerow

 

[mdavlee]

Rich has detailed pictures.

 

[WKEND LUMBERJAK]

We have had some discussions about doing that Kenneth. I don't think we have a thread dedicated to it though.

@mdavlee

@Hedgerow

Feel fee to make this it the more info here the less we have to search over there.

 

[acp104]

Rich (Poleman) definitely has the most info on this, but I'll throw some comments in here for now figuring he'll come along later. 272 coil is what I was told. This appears to be the one I used: http://www.ebay.com/itm/Ignition-Co...340831?hash=item43e2f253df:g:TawAAMXQhpdRsK8F . And I've attached a pic of it installed and an example of where material has to be removed from the mount to make one fit. Use the existing coil wire, but reroute it behind the coil between coil and case. I used one small washer between the mount and case for each screw to get a hair more clearance for the coil wire, then a washer on top to make up for the hogged out holes in the mount. I used a .010 feeler gauge to assure proper air gap between flywheel and coil, but a business card is fine too. Its a tight fit, and you'll wish the coil wire was longer. You can gain a little wire length by removing the clips that hold it in the case behind the flywheel, pulling a little more, then reinstalling the clips. If you saw much of the thread on AS, you know you need to grind the cast in key out of the flywheel and advance the flywheel 3o degrees to make the coil work. Once that is done, at least for me, it was tricky to get my flywheel tight enough to not slip and maintain proper timing. I'll let someone else like Poleman elaborate on the timing change, since I had some problems, and eventually sent my saw to Carl Miller to iron out the timing and port it. Carl actually cut a keyway in my flywheel at the proper position for the 272 coil and installed a key. I'm not saying that retiming it should be too difficult, but it ended up being a problem for me.

Since Mastermind and some others are working on producing a bolt on unlimited aftermarket coil for these saws, I'd probably hold off awhile on this mod and see if that comes together sooner than later before I permanently altered my flywheel.

 

[mdavlee]

Matt is working on his now. I sent it back with 3 coils. One Oem with pressed in husky laminate, oem, and a 272 husky coil. I didn't get it dialed in on one so I swapped another on and then sent it to him.

 

[WKEND LUMBERJAK]

Matt is working on his now. I sent it back with 3 coils. One Oem with pressed in husky laminate, oem, and a 272 husky coil. I didn't get it dialed in on one so I swapped another on and then sent it to him.

Is he working on the one you built. That thing is a animal.

 

[mdavlee]

Is he working on the one you built. That thing is a animal.

Yes. Trying to get another little bit out of it with the unlimited coil.

 

[cgraham1]

@Poleman ...

I personally hate the rev limited coil. I am waiting for the AM unlimited coil to come out, because I don't wanna mess with moving my flywheel and all that other stuff.

I ain't smart like some of you guys.

 

[Hedgerow]

And it's proving to be more of a task than one would think. Cause if it ain't just right, the saw will run, but not to it's potential.

 

[acp104]

And it's proving to be more of a task than one would think. Cause if it ain't just right, the saw will run, but not to it's potential.

I thought I had mine pretty close, but it didn't want to hot start. I went back and messed with it, and never could get it that close again. Its real important that things are reference marked correctly before grinding out the key, or you're in trouble without another stock flywheel handy. I'm sure guys that are used to setting up a degree wheel on a saw would have no trouble, but easy for a greenhorn to screw up.

 

[Mastermind]

Good stuff guys. I managed to get one to run with a Poulan Wild Thing coil. The problem is that the wire in those coils is epoxied in.

 

[shorthunter]

And it's proving to be more of a task than one would think. Cause if it ain't just right, the saw will run, but not to it's potential.

Just keep advancing the ignition until it starts like my 385

 

[Hedgerow]

Just keep advancing the ignition until it starts like my 385

Lol...



No...


Went back with stock coil, a few degrees advance, and boo yaaahhh!!!!

The mutt is pissed, and wants unleashed!!

 

[Hedgerow]

I hate replacing ropes all the time!!!
Lol.

 

[Miller Mod Saws]

Kenneth I just seen this. Ill let poleman explain as he had very detailed pics and procedures. But just give me a jingle and I can walk ya threw it. It's not that bad. Definatly easier for me if I use a degree wheel.

 

[Mastermind]

We need Poleman here........where is he?

 

[Miller Mod Saws]

We need Poleman here........where is he?

I'll text him.

 

[Adirondackstihl]

There are (2) different OEM coil/flywheel combos for the 7900.

That's about all I can contribute

 

[Poleman]

Hey boys....whatcha need to know????