Chainsaw Repair
Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Husqvarna => Topic started by: yldflight on October 12, 2012, 03:52:39 pm
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I am curious as to how many sprocket pin options there are for Husqvarna 3120XP chainsaw, i.e. 7 pin, 8 pin, 9 pin, 10pin ????
One of my 3120's runs a 24 inch bar and the engine has enough power to run a lot more chain speed, which should give faster speed in the cut, requiring me to spend less time hanging onto the saw.
If different pin options are available, where can they be purchased?
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Lots of folks on here can help you out with this.
The largest rim sprocket Husqvarna has to offer for this saw is 8T -3/8, 7T-.404 but Oregon does offer a 8T-.404 rim which I have several of.
What size of guide bar and size of wood do you cut?
There are aftermarket rim sprockets available in almost any size you want. Madsen's out of Centralia, Washington sells these rims. Be warned though these rims are not as durable as a Oregon or Stihl factory rim because of their pressed pin design but do get the job done.
Unless someone else out there knows of a better aftermarket rim with a factory cast design, this is the best advice I can give you.
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That big homelite in my avatar and both my 125 Macs run 8 pin .404. A 3120 would have no problem at all with an 8 pin and a 36" bar if wanted it to .
Now I've seen custom made spurs that would mount on a rim drive system up to ten count .I have no idea who made them .
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Now I've seen custom made spurs that would mount on a rim drive system up to ten count .I have no idea who made them .
Here you go Al, this guy is from your neck of the woods: T.R.[Terry]Cullins
39220 Hemlock Grove Rd.
Hemlock Grove, Ohio 45738
[614] 992-5992
Terry built me some beautiful made standard 7 spline 3/8 eleven tooth and thirteen tooth spur sprockets back in the early 1980's.
I haven't talked to him since 1983 but he's probably still around.
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The actual spur itself would not be hard to do .Broaching the splines for the drive would be a real challange .Larry S had a 10 spur gear on a saw I think that was done by Ken Dunn .I think it was souped 090 .I ran the thing but oddly can't remember what it was .John Lambert also had a tall gear deal but I can't remember that one either .Fact as I think back big Dave N had an 066 with a ten spur 3/8"
What everyone has to remember when you get into those tall gears you have to have a modified bar with more heel to it else it will fling chains .Not good at all .
Ha I tried to pull a ten pin type on a Mac 125 in .404 .It would pull it but it didn't like it .It was one of those deals where the thing was one unit,drum and drive were one piece .That was about the time I came to the realization not to use a 125 McCulloch as a cookie cutter and use it for what it was built for ,big wood .
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Yes for those big sprockets you have to cut the tail of the bar to match and keep the two as close together as you can.
To add to my last post Terry from Hemlock Grove built these custom spur sprockets with a 7 spline bore from 9T -13T 3/8[.375] He also had an assortment of 1/2".
These are 1983 prices but his 11T sprocket cost me $55 and the 13T $65 ;)
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I live in Melbourne, Australia, so would have to get the parts shipped out here.
I would love to experiment with a 9 pin, 10 pin and 11 pin.
I'm using a 58 thou, 24 inch bar and .404 chain on the 3120.
Fabian
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I think what you are going to find is if you get up above a 9 tooth on a stock engine you aren't going to gain much .Every engine has a torque band where they run the best . Taller gears while in some instances can help may in fact bog the engine to the point they don't cut as well .Oh the engine will pull it but it never gets in that "sweet spot "
Of course you can compensate that by cutting the raker depths less aggressive .Might be an idea if you were racing the thing but a whole lot of fiddling around just for normal wood cutting .
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I agree with Al, racing is one thing wood cutting for work is another. Fabian with your stock 3120 and .404 I'd run a 8T .404 Oregon rim. You would have a 7T rim at the moment.
The .404 setup is good for a work saw of that size. .404 chain is not cheap though on this side of the pond anyways.
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My 3120 only has a baby small 24 inch bar. You would think that it should easily pull a 9T or 10T ???
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I owned and ran a stock 3120 with unlimited coil turning about 12.1K out of wood and ran a 9T with 3/8 chain. Thats as far as I would go with one stock and I was just running 20" and would be about equal to 404 8T for rim size I think.
32" I ran 8T 3/8 buried ripping and wouldnt want a 9T on there then. JMO
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My 3120 only has a baby small 24 inch bar. You would think that it should easily pull a 9T or 10T ???
Good advice Kevin you have been there and done it.
Depends what species of wood you're cutting down under Fabian. 9T-10T in 3/8[.375"] is possible in softwoods with a unmodified 3120-24", but not in that tooth count in the larger .404
If you don't plan on getting into speed cutting competitions,if only work then keep the .404 setup [rim,sprocket bar nose & chain] The most durable and longer sharpening chain size out there for todays hand held saws.
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I have a stock 084 with a 7 tooth rim and 30" '404' RSC B&C. It seems as natural as anything. Is perfect.
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I am cutting Australian hardwood - red gum, yellow box, mountain ash. I can tell you that dry yellow box has to be about the toughest wood to cut.
When you crunch the numbers, going from a 7T to an 8T is only increases the chain speed by 11.5%
The 3120 should handle that increase like a walk in the park, with .404 chain and a only a 24 inch bar.
Going to a 9T gives much better numbers: 28.5% increase in chain speed over a 7T - a significant improvement.
I'll try an Oregon 8T and see how it goes using a .404 chain.
What is the website and the price for a good 9T sprocket, bearing in mind that i'm in Australia, so would need to include shipping cost.
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Danzco makes them and sales them. About 9T 3/8 $22 to sky's the limited. ;)
I've never messed with 404 above 8T so here makers website. 404 8t-15t http://www.danzcoinc.com/html/_404_pitch.html
Big pin sprockets for 1/4 325 3/8 404 1/2 3/4 http://www.danzcoinc.com/html/chain_saw_sprockets.html
Sprocket tuning http://www.madsens1.com/bnc_sproc_tun.htm
More on sprockets http://www.madsens1.com/bnc_sprocket.htm
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I'm with Kevin , 9T is enough . I know my 3120 won't gain anything with a 10T even for cutting small softwood .
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Holy heck, those sprocket sizes go up to 22T
By the numbers, (and on a 3120) a 22T sprocket will have chain speed that's 314% faster than a 7T - yeah baby that's my kind of chain speed - now i just need 314% more horsepower to drive it ;D
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I'm with Kevin , 9T is enough . I know my 3120 won't gain anything with a 10T even for cutting small softwood .
Where abouts did you get your 9T and what was it worth ???
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I'm with Kevin , 9T is enough . I know my 3120 won't gain anything with a 10T even for cutting small softwood .
Where abouts did you get your 9T and what was it worth ???
Just buy a Oregon 8T-.404 rim sprocket, it's approximately the same size as a 9T-3/8"[.375] Then you have a good strong quality rim and you can still use your .404 b/c..
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I get all my racing sprockets from madsens in the us . Good customer service , good price , I highly recommend them . Only problem is there is a minimum of 300$ for international order . Oh and I the last ones I bought were 23 $ a piece
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I get all my racing sprockets from madsens in the us . Good customer service , good price , I highly recommend them . Only problem is there is a minimum of 300$ for international order . Oh and I the last ones I bought were 23 $ a piece
I've been doing with Madsens for 30 years, back when Sam and his dad Ralph were running the business . Sam's sister Mary did the books.
Great great people. On my 1st visit to their shop in Centralia Washington in the early 1980s, Sam and Ralph demanded I stay at their house and forget the hotel. I spent several days with them and ended my visit with a outdoor barbeque with their favorite pro timber faller customers......talk about chainsaw heaven. 8)
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Wow, are we talking the "Centralia, where fires are burning under the surface - that is an amazing place; you can kiln dry your firewood just by placing it on the ground :o
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Chainsaw Rim Rocket Sprocket, 404, 9-Tooth
http://www.ebay.com/itm/Chain-saw-Rim-Rocket-Sprocket-404-9-Tooth-WOW-/360293943582 (http://www.ebay.com/itm/Chain-saw-Rim-Rocket-Sprocket-404-9-Tooth-WOW-/360293943582)
Please post in proper boards ;). Here or in ebay thread seems like the appropriate thread for this post.
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That 404 9 you posted would be like running a 3/8 10. Lets see your 3120 and is it a stock 3120?
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Yes, it's a completely stock standard 3120XP, but lets face it, it's a full 118cc of raw unstoppable (Husqvarna Xtra Performance) cutting power, and it's only spinning .404 chain on a tiny 24 inch bar.
I've just ordered the 9T .404 rim sprocket and will make a full report when it's been installed on the saw and given a decent test run.
Having 26% more chain speed (over a 7T) is an appealing thought. If it translates into 26% faster cutting time, i'll be a happy chappy ;D
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Well now in no way discrediting this raw "unstoppable power "you will soon find out if you haven't already that you can reach a point it's not unstoppable .
I've had my hot little hands on just about every large displacement saw ever made including a 3120 Husqvarna and they all will reach a limit where taller gearing doesn't help them .
Even if you soup that thing to the max with a stock crankshaft what you'll end up doing is breaking a crankshaft or breaking a rod .Then it's all for naught .