Chainsaw Repair
Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Husqvarna => Topic started by: alsled on November 05, 2013, 07:07:10 pm
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So whats every ones input on this? Thinking of putting a 8 tooth sprocket on a 390xp with a 20'' bar. Good, bad Idea?
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It should be fine.
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So whats every ones input on this? Thinking of putting a 8 tooth sprocket on a 390xp with a 20'' bar. Good, bad Idea?
Limbing and topping with falling included go for it. If round filed and heavy bucking go with the 7 tooth.
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A 390 with a 20" bar, I wouldn't consider anything but an 8 pin!
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A 390 with a 20" bar, I wouldn't consider anything but an 8 pin!
Yes the almighty short 20" bar will make any big cube saw cut like a banshee ha ha.
Time both 7T and 8T with a round filed chain on your 390XP in a log and see which one cuts faster. The only gain you may see with your stock 390 with the 8T is when your running square ground chain.
BTW when I bought my 395XP brand new it came from the factory with a 7T 3/8
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I use 8T rims with 3/8 X .050" X 60DL (reworked)square chain on my 372 & 066 cookie cutter saws.
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It is easy and cheap to swap back and forth anyway, but 8-pin sounds like the obvious choise for a 20" on a 390xp.... ;D
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It is easy and cheap to swap back and forth anyway, but 8-pin sounds like the obvious choise for a 20" on a 390xp.... ;D
So whats every ones input on this? Thinking of putting a 8 tooth sprocket on a 390xp with a 20'' bar. Good, bad Idea?
Limbing and topping with falling included go for it. If round filed and heavy bucking go with the 7 tooth.
As I said earlier run the 8T, I found even with the higher chain speed the larger diameter sprocket is easier on bars and the chain's chassis . 8T great for limbing and general tree work.
But for cookie cutting at a GTG or chainsaw contest using a 7T rim on a fast cutting round filed chain can beat a average square filed chain with an 8.
It takes a lower gear to pull an aggressive angle round filed chain well.
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It is all what your preference is on torque available and how you sharpen chain and how hard you push on a saw.
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But for cookie cutting at a GTG or chainsaw contest using a 7T rim on a fast cutting round filed chain can beat a average square filed chain with an 8.
It takes a lower gear to pull an aggressive angle round filed chain well.
I takes a lot of power to pull an aggressive square ground chain too. I use a lot of cubes on a short bar for cookies.
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I feel that on short bars you can run a 7 or 8 and like was said earlier you won't notice that much of a difference. You will gain a little more chain speed. If you are running long bars I would stick with a 7 pin slower chain speed but more torque to pull it threw the cut. Based on a stock saw, it all changes as mods start to happen.
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Running an 8 T on my WP 681 Solo 20" bar it likes it a lot.
Shep
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As I tried to say, just try the options yourself - rims are cheap, at least in those sizes. ;)