redbull660
Addicted to ArboristSite
finally got around to doing my dp muff on my 660. Tested it out before and after in some big oak. 36" bar and new stihl RSC
Gains seem pretty good. Sounds awesome
Gains seem pretty good. Sounds awesome
660 in big oak before and after DP muffler
- Thread starter redbull660
- Start date
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M
moody
Guest
You should probably richen it up a little.
Knobby57
Peeing outdoors
Sounds very lean . Fatten up the fuel and have some fun 
banana boat
ArboristSite Operative
X3 sounds lean after the mm
Stihlman441
Addicted to ArboristSite
I agree sounds a tad lean.
Man I wish I could discern a good 4-stroke as well as you fellas can.
My 660 is my only saw that I can clearly hear it 4-stroking well. I set all my saws with a tach lower than the factory specs so I'm not worried they are to lean. I guess I'm just not exsperienced enough yet.
My 660 is my only saw that I can clearly hear it 4-stroking well. I set all my saws with a tach lower than the factory specs so I'm not worried they are to lean. I guess I'm just not exsperienced enough yet.
M
moody
Guest
Don't use a tac just richen the h needle listen for the saw to blubber. Listen to this saw here. You'll here a distinct change in the tone when under load.
Trx250r180
Saw polisher
way i tune ,i drop the bar into that log ,and during the cut richen the h till it runs the strongest under load ,go a little richer till 4 strokes then back off till cleans up ,the long bar tune out here ,pull the muffler cover and there should be some oil residue in there if tuned right ,if real dry you are still too lean ,are you at 32 to 1 on the oil ?
saw does sound a lot happier with the dual port
saw does sound a lot happier with the dual port
Str8six
ArboristSite Operative
If a fella cant distinguish the 4 stroke sound on that saw in the video then there is no hope for him ever being able to! I still say that is the best sounding saw I have ever heard. I have listened to that video a hundred times I bet.
M
moody
Guest
M
moody
Guest
The tune on the 18 is better. You'll need to adjust the tune for longer bars as more load is added tge saw uses more fuel.
HuskStihl
Chairin'em for the sound
I thought it was barely 4 stroking out out of the cut on the 25".
Here's how a similar sized saw sounds with what I consider to be a pretty rich tune
Here's how a similar sized saw sounds with what I consider to be a pretty rich tune
HuskStihl
Chairin'em for the sound
Here's a leaner (13.4k) tune, but still acceptable (to me)
Chris-PA
Where the Wild Things Are
Moody, the carb knows absolutely nothing about load. All that happens is that the increased load drops the rpm and air velocity through the carb, so it gets leaner.
M
moody
Guest
That's why I said that he needs to richen it up. I dont recall saying that the carb knew anything about the load
towingace
ArboristSite Guru
On MOODY'S vid I can clearly here the 4 stroke before it goes in the wood but after he sinks it in the log I can't really tell. I had my biannual physical for my CDL about 3 weeks ago and my hearing isn't doing so well. Don't know if that's a valid excuse. My doc is recommending more advanced testing and the likelihood of a hearing aid. Nonetheless, I can clearly here it out of the cut, so it must be more discernible before the load is put on it?
Chris-PA
Where the Wild Things Are
Properly tuned it does not misfire while under max load. It's when you lift that the rpms go up, the air velocity through the carb increases and the mixture gets rich enough to misfire. So you should not be hearing it under load.
