Author Topic: Jonsered 111s  (Read 2419 times)

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Offline 660magnum

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Re: Jonsered 111s
« Reply #40 on: January 29, 2013, 09:51:58 pm »
His name is Rich Dougan and his Email address is sawking@hotmail.com

The saw was for sale, he may have sold it by now?
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Offline Peter Davies

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Re: Jonsered 111s
« Reply #41 on: February 03, 2013, 08:26:37 pm »
Hi,
I've been having a look at the factory specs for the 111S; they give points gap at 0.3-0.4 mm (12-15 thou). Thats fine. But they give the advance as 3.8 mm. That might be fine if I knew where they measured it!! It can't be at the perimeter of the fly wheel; must be on the crank shaft; that will be hard to measure!

The way I did it at 22 BTDC, had the cam follower too high on the cam.

Any thoughts??

cheers

Peter Davies

Offline 660magnum

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Re: Jonsered 111s
« Reply #42 on: February 03, 2013, 10:21:46 pm »
Boy, I don't  know about that one. Sounds to far to be on the crankshaft cam lobe and not far enough on the perimeter of the flywheel?

If the chainsaw runs OK I'm sure it doesn't need to be moved?

Set a protractor on the nose of the crank to see about how far out from center 3.8mm would be on the 22 degree line?
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Offline Peter Davies

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Re: Jonsered 111s
« Reply #43 on: February 07, 2013, 07:41:38 pm »
Hi Magnum,
I've done the calculations on the 3.8mm BTDC; on the jonsered 15mm dia crank, it gives 29 BTDC. That checks out visually; there is a very sudden step on the timing lobe; that is about 3.8mm, or 29 deg BTDC. That means that almost whatever one sets the points at, they will fire on that step; just leaves the backplate to set up with the cigarette paper. When I set it up for 22 deg, it was too far up the cam and only gave a max gap of about 2 thou; that probably explains why the timing went off so rapidly. The points never opened quickly enough to  prevent a long spark; hence the pipping?

So I will set it for 29 deg. I'm also going to try an electronic fix that will eliminate the points and condenser; not one for the purist, but if it works, and the saw can go out and earn money, that will do it for me!

cheers

Peter Davies

Offline 660magnum

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Re: Jonsered 111s
« Reply #44 on: February 07, 2013, 08:58:24 pm »
29 degrees advance is a good figure.

All my custom model airplane engines I have made from weed whackers and chain saws, I have the ignition set at 28 degrees advance.
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Offline Peter Davies

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Re: Jonsered 111s
« Reply #45 on: February 11, 2013, 01:54:48 pm »
the 111s is reluctant to start; there is a huge spark so the fuel system is due for attention. Repair kits for the Tillotson carb appear easy enough, but what about the fuel supply line?? Any thoughts/suggestions?

Offline 660magnum

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Re: Jonsered 111s
« Reply #46 on: February 11, 2013, 03:43:28 pm »
If it is that old I would replace them
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Offline Peter Davies

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Re: Jonsered 111s
« Reply #47 on: February 11, 2013, 09:57:34 pm »
I'm not sure it is that easy. On first inspection, I thought they were just lengths of rubber hose pushed onto fittings. The supply line has a metal collar around it as it goes to a  through tank fitting; the vent line is probably similar. To get a really close look, I would have to take off all the body casing, I think! If the fuel supply line, and vent line, are Jonsered parts, I could be struggling!

Offline 660magnum

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Re: Jonsered 111s
« Reply #48 on: February 11, 2013, 11:45:41 pm »
Jonsered parts are hard to come by right now, even for current product units unless the dealer has them in stock but for an older out of production genuine Jonsered product - impossible

You may have to improvise?
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Offline Peter Davies

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Re: Jonsered 111s
« Reply #49 on: February 12, 2013, 12:58:38 pm »
Looks like I've got lucky! Both the supply, and vent line, are standard tubing. There are aluminum, threaded, through tank fittings. They were impossible to see under the accumulated grime of ages, and I didn't want to be aggressive in case I broke something that was irriplaceable!

 

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