Hear chain on 7900 (no problem)

[B_Turner]

I've got a 7900 a couple weeks ago, and as I've posted before: the tensioner is funky and it is bit of an oil puddler when parked.

But I really like it and it is the saw I reach for when cutting anything less that say 25 inches on the tape. For bigger wood I prefer my 395 or 066.

It is my favorite running motor, with smooth even and strong power response in a light package. If Dolmar can clean up their distribution chain, I agree with Freakenstein and the others that this saw poses a big threat to Stihl and Husky in that market (and maybe the 5100s as well).

Here's my weird question: From the first time I ran the saw, I could really hear the chain whirling. Not loud or a bad sound, but I have never noticed before on my other saws. Mostly running a Oregon 28 inch bar. But it is the same bars and chains I run on my other Huskies.

Any ideas on why I am hearing the chain whirling on the bar on the 7900? It's got me stumped, although its not a problem or anything. Not loud or scary sounding, but noticable. I was hoping someone could shed some light.

My only theory is that unlike my other saws, the exhaust and it's sound is directed much more to the side and thus is not covering up the much quieter sound of the chain.

BTW, the oiler seems to be working fine as far as I can tell.

Any other theories? Again, it's not a problem. I'm just the curious type.

 

[computeruser]

Could it be because you forgot to wear your hearing protection?

Ok, enough silliness.

Seriously, I don't know, though it is curious. Do you get the sense that the noise is bar/chain noise or sprocket/chain noise? Have you tried a different sprocket? If I wasn't nicely dressed in no-stinky-saws clothes, I'd go fire mine up and see if I noticed it. I doubt I'd hear it over the dual-port muffler, but I will check it out on my buddy's unmodified 6401. The stock muffler setup does do a very good job of getting the noise away from the saw and the operator, though.

I'll be interested to see what others think.

Glad you're liking the 7900. It is a heck of a saw, isn't it? What kind of chain are you running on the 28" setup? I'm still not sure whether I like skip or fullcomp better on that length.

 

[B_Turner]

Could it be because you forgot to wear your hearing protection?

Ok, enough silliness.

Seriously, I don't know, though it is curious. Do you get the sense that the noise is bar/chain noise or sprocket/chain noise? Have you tried a different sprocket? If I wasn't nicely dressed in no-stinky-saws clothes, I'd go fire mine up and see if I noticed it. I doubt I'd hear it over the dual-port muffler, but I will check it out on my buddy's unmodified 6401. The stock muffler setup does do a very good job of getting the noise away from the saw and the operator, though.

I'll be interested to see what others think.

Glad you're liking the 7900. It is a heck of a saw, isn't it? What kind of chain are you running on the 28" setup? I'm still not sure whether I like skip or fullcomp better on that length.

Frankly I am very skeptical of testimonials but when I heard of all you raving about the 7900 I had to try one for myself. It is the funnest saw to run that I own, and I may buy another to run a shorter bar on even though I already have a 20" on two other saws. The 7900's in my blood. The way it looks has even grown on me, with it's forward leaning tension and energy --makes my much loved Stihls and Huskies look a bit stoic.

I tried a brand new bar with a young chain, and my sense is that it's not the sprocket but rather the chain/bar making the sound. It's very weird. I haven't tried another sprocket and will probably give that a try.

I mostly run REALLY sharp full skip on the 28, largely because I do alot of side grained cutting (noodles) with it to block out wood and the full skip doesn't have as much as a plugging problem under the sprocket cover. But it pulls a full comp okay on normal cutting and it cuts a bit faster with full comp. But with a sharp square ground full skip it cuts almost as fast and takes half the time to sharpen. I'm totally hooked on square ground and the other day ran my 395 against a muffler modded 395 and beat him. He was a bit bummed, but I didn't tell him about how sharp my chains were yet.

I think the 7900 actually works better with a 24 inch bar, but most of what I cut is too big for that and I like using the 7900. I think maybe I am talking myself into a second 7900 as I write this.

Bottom line is: anyone that likes saws in the 70-80cc range really owes it to theirselves to try the 7900. Bubblesaw...Bubblesaw....