Since it has a serial number sticker on it I would assume so.
Nik's Poulan Thread
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Since it has a serial number sticker on it I would assume so.
2b2r, the two rear corner outlets on your 3400 muffler are 0.75 square inch area . The diffuser area is 0.882 square inch . The baffle six holes add up to 0.502 square inch area .
You could open four of the six baffle holes .
Is there some sort of rule to opening the muffler or exhaust as a total
I would open up the coil holes on the bottom side and let the coil rotate up. Never mind not enough room, you need. 30 for 5*
I suspect that would retard the timing.
No you rotate into the direction of the turn of the flywheel to advance the timing, coil moves up. If you use the flywheel to advance then it goes with the turn
Before Cory get's back.
I believe some guys use a penny and make a key from that.
I think the best way is to download a degree wheel from the internet and glue it onto a piece of card stock so you know what your timing changes are.
I have filed the backside of the key area that sits above the crankshaft keyway. I mark the key with red marker when it's seated in the keyway, pull it out and put it in a vice and file a bit off. Doing it this way will advance the timing but without a degree wheel you won't be able to measure how much it was advanced, so......
Bear with me while I think this through. Math was never my strong point so I may need some correction here from you guys that are math strong.
Assuming the crankshaft dia is .625" (3400 through 4000 series) and the circumference of a circle is = pi X diameter
The circumference would be 3.1416 X .625= 1.964"
Divide that to get a degree dimension by 360 deg.
1.964" / 360 = .0055"
That tells me that for every 5-1/2 thou I take off the back of the key, I advance the timing by one degree over the stock setting.
Makes sense to me.
Anybody?
redunshee
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Wouldn’t that retard the timing? My understanding is you want to move the flywheel counterclockwise a hair. Would seem if you move the coil instead , you would want to lower it a bit. On second thought , moving the flywheel counterclockwise in effect ,I suppose ,raises the coil. I think!
redunshee
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Good Golly Miss Molly!
redunshee
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On another subject. Has anyone compared the performance between a 3700 and PP365? Got a PP365 from Joe and it seems to have more grunt, though I haven’t put either in wood.
Raise the coil or grind on the key to move flywheel foward, same effect, advanced timing. Not much room for coil so flywheel is easier to advance.
Steve
Steve
Yep few of us noticed that and why we sell those series. It's a win win. Lighter and faster cutting 365 3500 and then you go 380 3750 for even better.
Why I been selling every 3400 3700 375 3800 4000 that comes through my hands.
Now how can you tell more grunt without putting in the wood is my question? But yes they are faster cutting in the wood.
Nice pile of logs, got your work cut out. Don't think I'd want to tackle that big piece at the top left of the picture.
Steve
Steve
And that would be CCW.
I have used the penny trick on plenty of saws. Sometimes it is almost to much advance. But it does work.
I ran them both. The 365 had a higher compression number but can't remember it. My thin ring 3.7 is very low hour and I think that saw had 160psi. The 3.7 had more lean on grunt and the 365 def turned faster. It's hard not to like those later 60cc poulans.
Steve,
The flywheel turns in the counter clockwise direction and if we want to increase timing advance we want the magnets on the flywheel to pass the laminations on the coil sooner for a given piston position in the stroke.
So, we move the flywheel counter clockwise to get them closer to the magnets.
Make sense?
That's why raising the coil position would move the contact to a later time and would retard the timing.
redunshee
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That's what do thought. Turn ccw
I had a brain fart, forgot they run ccw, worked on top many car engines
Steve
Steve
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