I removed a excessively worn out and neglected 7 tooth spur drive sprocket from a Husqvarna model 61. I see an Oregon part number replacement 26831 rim style with 7 tooth rim. But I also found a Husqvarna # 501 831 503 rim style. However, the Husqvarna comes with an 8 tooth drove sprocket. I have an extra 7 tooth also. I plan on running an 18" bar. So I think I should just run the 8 tooth sprocket. Looking for advise on pros vs cons on the 7 vs 8 tooth drive sprocket. Looks like the 61 was available new with either a spur or rim.
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You will be fine with the 8 tooth, the saw has the torque to handle the additional chain speed. For more than occasional consumer use the rim is preferable.
Thank you Saw Guy. Appreciate the information. Will the 8 tooth rim spin the chain faster than the 7 tooth? With eng rpm the same.
Yes it will. You need some torque to pull it off, but you'll be fine for the bar size you're using and that saw.
Kevin
Most likely a 8 pin will cut slower in big wood but you sure can try it. Steve
I think, (not sure). that the multiplier is around 15%. So, 15% increase in chain speed and a corresponding loss of torque. 8 pins were almost universal on saws like the Jonsered 70E, as it had gobs of torque but only spun at 11,000 rpm. On something like the 61 it is definitely not for users who like to push on the saw. But like the other guys are saying, you should be OK with an 18 on it. It's a bit of a technique thing; pushing vs letting the chain speed do it's thing.
Since you have them both how 'bout you compare them and then share your impressions? :)
I will try the 8 tooth first. Then switch to the 7. Will see how it goes. My take on this is performance will be based on if the engine doesn't get lugged down. Like pulling up a hill in second gear when I should have been in first.
Like Bob said, torque is everything when you step up the tooth count. But given the bar you want to use and a sharp chain, it's doable. However, you'll definitely notice the difference in available torque. Whether or not you can compensate for it, or even like using the 8 tooth rim remains to be seen.
I tried it in back in the day on large cc Huskies. I don't like anything messing with my torque....so I wasn't a fan, but some swore by it. Different strokes for different folk, literally!.
Kevin
In the power transmission world, drive sprockets are normally odd numbered while driven sprockets are even.
This is to even out wear to sprocket and chain by allowing the teeth to encounter a different link on every turn.
Some folks use a 7 tooth driver as standard and change driven to make speed adjustments.
May not matter here, just a thought.
So, while doing this upgrade from a spur sprocket to a rim sprocket, I found the 61 used a fine thread or a course thread for the clutch to crank threads. Also two or three shoe clutch. This 61 is fine thread, and three shoe. I decided to test run the 8 tooth rim first.
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So one solid day of cutting with the 8 tooth rim sprocket. No complaints of the performance of torque in the cut. Ash and Oak. New bar and new chain. Using Oregon 72EXL chain and Sandvic bar. Will cut one more day with it, switch to 7 tooth and put a new chain. This way it will be as close as apples to apples that I can do.
There were some new parts used with the rim setup vs the spur setup. Photo shows a steel plate that protects the oil drive gear and a plastic white shield that sets into a groove in the oil pump housing. This seems superior over the spur that only has a metal plate that is attached to the hub. Spur style seems to allow more debris in the oil pump drive gear area.
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Well the broken fins on the starter cover were bothering me. Just cosmetic, but might as well make the old 61 look respectable.
In the photo upper left corner you can see the damaged fins. Well easy enough. Bought a opened package new OEM starter cover and went to switching it over.
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Thought it would be just untie knot, remove starter handle, thread rope through cover and two Philips screws holding the recoil assembly to the starter cover.
When all else fails, read the instructions, right!
Well the spring comes out and reminded me of my youth and having to rewind the springs on the old Brigess and Stratton go cart motors.
A few patient minutes later and three attempts, the cat was back in the box. Reassembled and happy with the final product.
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Information for someone who is putting the recoil spring back into position here was what worked for me. With starter cover on the bench, start with the outer most coil of the spring. It has a hooked end that fits snug into the tab on the starter cover. Start rolling the coils one loop at a time into the cover. Use your fingers to hold the coils down and in position. Three points equally spaced around the spring works well. Put center spool in with rope already spooled. There is a slot on the spool to retain the end of the rope. Rotate the spool about 1/2 to 3/4 of a turn clockwise. Thread rope end through the hole in the cover and put handle on. Tie off end with a good knot. This gave me good recoil tension and pulled handle back to a secure rest into the cover.
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A double loop knot on handle end.
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a tuck under the first wrap on the recoil end. Melted both ends to prevent fraying.
Regarding Husky 61 saws, anyone here have a problem with the muffler working loose and the attaching screws stripping the holes?
If so is there a good fix?
I bought the saw in 93 and gave it to my son about 12 years ago When I upgraded to an Echo cs600p.
He has retired it due to the muffler problem
I have always torqued, test run for 10-15 minutes then retorque again while still warm.
However, once the threads are damaged and no longer able to be torqued to spec, I have drilled and installed a time-sert brand insert. You could also go up a size and modify the holes through the muffler.
I would also wait for a reply from Spike who would have some great advise.
Had storm damage Monday evening. Had to get to work on it so power lines could be repaired. So just ran the 61 with the 8 toothed drive sprocket. Full day of cutting. 4 Gallons of fuel through the saw. Cut up some pine, oak and ash. No problems at all with this 8 tooth sprocket. Neighbor noted how well the saw was cutting. He put his saw down and run my 61 for two tanks. Now he wants one just like it.
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Four gallons in a day on that sized saw is a lot of run time and a long day .Most saws no matter who made them is about 40 minutes of run time per tank full on a stock saw .More of course if it's modified .I myself would not use that much fuel in a month .
I had a mess to clean up.
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I did fill neighbors Jonsered saw once, and my echo twlce. All the rest went into the 61. Started my day at 4:30, started the saw at 6:00. I know I cut for a good 12 hours. Had a lift truck come out to pull the trunk out of my pole barn. That crew made four large cuts and hauled away the pine trunks. One pine was 85 feet.
Those straight line winds can do some damage .Usually around here they come from the west and going over Indiana they pick up speed .As far as I know the only thing I lost was a black cherry from a big blow about 3 weeks ago .Too skinny to save for lumber but growing in competition about 90 feet tall .Broke it off like a match stick .There were trees down every where in this location like big hickories .Business for the tree trimmers and next years firewood for some I suppose .
Putting the 7 tooth sprocket on the 61 Saturday morning. Will compare performance between the two. Lots of cutting left to do.
Yes, the straight line winds are what caused all the damage here on Memorial day at about 7:00 pm. Took the tops off several tall pines. The wet soil caused the one to uproot and cut my pole barn in half. The oaks and maples stayed rooted, but we're snapped off.
Oaks will take a lot of wind where as tough wood like hickory will snap like a tooth pick .A property known almost forever because oak as rule was what was used for great sailing ships in the days of wind jammers for masts .Pine for the most part are mountain trees with shallow roots as opposed to most hardwoods with deep tap roots .In this deep organic soil in these parts they blow right over roots and all .This last big blow I saw hickories broken off 4 feet up where they were 2 feet in diameter and solid broken like tooth picks .Mother nature can really be cruel hearted at times and a force never to be taken lightly .
When I bought my 395XP-32" brand new it came from the factory with a 7T - 3/8" rim sprocket.
Bigger is not always better.
With a large saw, like near 100 cc and over it's not so much about speed just power ..
When I use the 550xp and also the 61 in the same day, what I notice is rpm vs torque. They both cut nice, but the 550 uses rpm and narrow kerf. The 61 is using torque. I think the 61 gets more work done, but it may just be me. I like old stuff. I am not knocking the 550, as it is very reliable and a very easy starting saw.
On that there is a lot to be said about torque versus speed .Being a collector, restorer I can say the weight of those old reed valve engines actually helps you in some situations like chunking up fire wood .A modern saw might crank on in the cut at 12,000 and the reeder at 8,000 but the oldie running .404 chain takes a bigger bite .Certainly the newer will be faster but not that much at the end of the day .I'm at the age now the boat anchors aren't used that much but I still give them a go every so often just to hear them snort .
I was unaware there were reed valve chainsaws. Thought they were all piston port, but it makes sense. Lots of other two strokes in marine and cycles have gone both ways.
Just a follow up on the Husqvarna 61 which is now running the 7 pin drive sprocket. The saw cuts great with either the 7 or 8 pin drive sprocket. The chain speed difference is noticeable. No issues with running out of torque with the 18" bar. The saw is a nice workhorse. I could go either way here, but the speed of the chain running the 8 pin drive sprocket makes fast work of cuts, really quite impressive. I will be cutting all weekend with it in the 7 pin configuration and see if I notice any additional differences or issues.
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Update. I prefer the 7 pin in the red oak where the whole bar is needed. The added torque is noticeable. The speed of the 8 pin is cool, but not practical in hard wood and 16-20" of a cut. Just my opinion.
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Nice arsenal of recovery straps and winch. Looks like you have the big daddy strap if you need it! 💪
Had to use the strap today to keep the oak from entering the roadway when I dropped it. Three oaks and an ash today. Stopped for lunch. Homemade pheasant pot pie.
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Forget the wood, I want me some of that pheasant pot pie😋😋
FWIW, I went to a 7 pin rim on my workhorse Stihl MS 290 last year and my results were the same as yours..The vast majority of our firewooding is hardwoods, Red, White and Water Oaks.
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I enjoy a good pheasant hunt. My buddy in the photo, Fred has been gone now for almost 2 years.
Fred looks like quite the companion. No doubt you miss him a lot.
15 and a half years and was an excellent companion. Never needed a leash or tied up. Always right by waiting at the truck, front door or by my side. He knew even the cadence of my voice and picked up on that to know what was expected. Someday, when I am ready, I will get another hunting companion and friend.
My first dog was like that.
Then we another one and was not as good.
Then a third one. ::)
Seem like every time they get "dumber" :D
Quote from: DHansen on March 05, 2023, 11:28:05 AM
15 and a half years and was an excellent companion. Never needed a leash or tied up. Always right by waiting at the truck, front door or by my side. He knew even the cadence of my voice and picked up on that to know what was expected. Someday, when I am ready, I will get another hunting companion and friend.
I know your journey only too well, he looks like a great one! We just recently buried our 14-1/2 year old GSP Millie and at 72 I'm hesitant to find another bird dog, just don't know if I'll be able to give it the hunting it deserves.
The memories are great. The photo of Fred and Myself it was -4° F for a high that day. Was a great day and I need more days like that one. Thankful for every healthy day God gives me.