Jonsereds 70E build

[Chainsaw Jim]

Now if someone would come up with some
Plastic fans!!!! Lol

No plastic here.

There are two aluminum flywheels on ebay right now. One alone for 30 and another with the trigger and coil for 85.

 

[Frank bierce]

Hmmm. I have a nice 70e that has been sitting because of a grenaded fan...when it grenaded, it also took out the coil wire. May have to get the flywheel with cool.... thanks!

 

[Chainsaw Jim]

Hmmm. I have a nice 70e that has been sitting because of a grenaded fan...when it grenaded, it also took out the coil wire. May have to get the flywheel with cool.... thanks!

http://m.ebay.com/itm/Jonsered-70E-...wheel-1216610104-CDI-/172386145046?nav=SEARCH

 

[awol]

Hmmm. I have a nice 70e that has been sitting because of a grenaded fan...when it grenaded, it also took out the coil wire. May have to get the flywheel with cool.... thanks!

That's a good start, but if you want to change to that newer ignition you will still need a cylinder. The early ones don't have the coil mount on them. Also, if looking for a plastic fan, remember a 621 fan will work; they are a bit more common.

 

[awol]

What percent of the ring leaves it Allen?

About three fourths or a bit more.

I have the squish cut and after careful measuring it appears no part of the ring will leave the plating. I took it as far as it will go before it freeports under the piston.
The factory squish with the stock piston was .040; after cutting the squish it will be around .020 so the compression should be good. View attachment 41078 View attachment 41079

The 268 piston has longer skirts, so you can go a bit farther before freeporting. It also has wider skirts and a single ring gapped above the intake.

 

[Heffalump]

But the owner of this 70E really wants a 2-ring piston. I also have it on good authority that he loves real Jonsereds, likes Stihl a lot, fully appreciates old Macs and Homies, and has a general aversion to anything Husqy.

 

[Onan18]

But the owner of this 70E really wants a 2-ring piston. I also have it on good authority that he loves real Jonsereds, likes Stihl a lot, fully appreciates old Macs and Homies, and has a general aversion to anything Husqy.

Why, everyone knows single ring pistons have less drag, and Husqvarna parts make any other saw faster by default!

 

[Chainsaw Jim]

All back together...

 

[Chainsaw Jim]

...and running:

 

[beaglebriar]

Sounds damn good Jim.

 

[Chainsaw Jim]

Here's a few of the first cuts. I'm trying to get the oiler figured out on this thing. It's running pretty dry in this video.
I decided to make a few cuts with it to see how it runs before adding a second port to the muffler.

 

[P.M.P.]

@Chainsaw Jim I'm a big fan of your work always dig your threads thanks man.

 

[Heffalump]

Hey @Jon1212 , recognize that Sandvik?

 

[Jon1212]

Hey @Jon1212 , recognize that Sandvik?

A'yup......I recognize quite a few guide bars that I see on the forums.

 

[Frank bierce]

Cuts quite nicely!! Great build

 

[Heffalump]

Hey Jim,

Do you think I should try out an 8 pin on that?

 

[Chainsaw Jim]

I'll give it a run with an 8 pin after I open up the muffler.

 

[drf256]

Nice job Jimbo.

 

[Chainsaw Jim]

I had a chance to run this thing some more yesterday and it's going back under the grinder. The considerable amount of distance the ports needed raised to compensate for the taller piston has it right about at stock form if it were built that way from the factory. I didn't want to take too much the first time around, but now I know that it needs a bit more.

 

[Heffalump]

Yes.....yes it does.........