SEASONS Are Changing, TUNE Your Saw!

[weimedog]

Or WHY Autotunes are cool
A Demonstration from my facebook "Husqvarna Autotunes Only" Group for those who are autotune users and fans.

 

[Backstage]

WOW. 800 rpm at idle change by taking it into denser cold air.

Assuming robust electronics, the autotune saws will have a lot lower chance of premature death.

 

[weimedog]

WOW. 800 rpm at idle change by taking it into denser cold air.

Assuming robust electronics, the autotune saws will have a lot lower chance of premature death.

That is correct. Both Stihl's M-Tronic and Husqvarna's Autotune's work well and their system's really haven't had issue, some of the SAW designs they wrap them around do, by Autotune is actually really simple.

 

[sean donato]

Not that I have any heated building where I could run a saw in here, but it would be interesting to see the same video with an mtronic or autotune running.

 

[weimedog]

Might do a "2.0" video? You or me , doesn't matter. I can replicate that as soon as the seasons turn. Also plug into the old CST to see where the numbers go. Funny thing, the new Autotunes are much faster to react than the older ones. So when I let my 565 run dry, the low side dropped to 15 ( From 70 ) Just in that period of time it took to suck the last drop out of the carb.

 

[Backstage]

Curious about the H side and WOT sound if you’re doing a 2.0 video.

 

[bwalker]

That is correct. Both Stihl's M-Tronic and Husqvarna's Autotune's work well and their system's really haven't had issue, some of the SAW designs they wrap them around do, by Autotune is actually really simple.

This in spades!
Both systems are very simple and they both work great IME. They are of great benifit to the average Joe who can't tune a carb to save his life.
IMO a carb needs to be set pretty much every time you run the saw and sometimes between morning and afternoon if you care about the saw running at peak.
It is funny that guys will freak out about a small change in oil ratio leaning out their saw, yet don't bat an eye about not touching the carb through a 20 degree swing in temp. The later has much more effect than the former.
When I raced bikes and sleds I used a air density gauge to assist in tuning. It was a real eye opener in regards to various atmospheric conditions effect on carb tuning.

 

[rob066]

Yeap had to turn my high and idle some, that was this morning . My chain would spin at idle and was a touch lean WOT. The temp here was nearly 35 degrees different than when it was last set in August. This is on a Husky 254

 

[sean donato]

Yeah already tweaked the 192, and got my 390xp out the other day and tweaked that. With the colder temps coming in next week, I'm sure the screw driver will just stay in my pocket. The 400 just does its thing. It's nice really.

 

[bwalker]

The other thing I would say is tuning by ear or four stroking in the cut etc is extremely coarse.
After decades of being exposed to noise at work, gun fire in spades and racing sleds and bikes my hearing is in poor shape. From a distance I can hear a saw four stroke. While running the thing all bets are off. As a result I use the cut and feel method until the saw runs best and record that max no load RPM with a tach. From there I have a reliable setpoint to tune to going forward. This method takes some messing around to get it right, buts to me its much more accurate day to day.
Luckily now my lone saw is Mtronic and I quit carrying a tach and a screwdriver in my pocket. Don't miss it either.

 

[weimedog]

The other thing I would say is tuning by ear or four stroking in the cut etc is extremely coarse.
After decades of being exposed to noise at work, gun fire in spades and racing sleds and bikes my hearing is in poor shape. From a distance I can hear a saw four stroke. While running the thing all bets are off. As a result I use the cut and feel method until the saw runs best and record that max no load RPM with a tach. From there I have a reliable setpoint to tune to going forward. This method takes some messing around to get it right, buts to me its much more accurate day to day.
Luckily now my lone saw is Mtronic and I quit carrying a tach and a screwdriver in my pocket. Don't miss it either.

Same really. I have my hobby saws where having a tool bag is part of the fun, then my working saws. They are Autotunes, a 565 & A couple of 562's. Carry a project saw too like a 372 based project, but when it counts I always have a pair of autotunes. Not getting pain to jerk around with a screw driver.

 

[North by Northwest]

I remember clearly from my racing sled days , how important barometric pressure , humidity & dew point all effected tuning requirements. Even more so within the early 70's vintage 500 & 600 Polaris Fuji ( Subaru) Air cooled Triples . Once liquid cooling came into the picture , the variables became more consistent . However not until ecu & fuel mapping systems entered the picture , a good ear , heat gun & spark plug analysis was still critical . The new Micro processor controlled saws have become much more efficient & reliable , within control & prevention . For the average user for obvious reasons this is a plus as has already been advised !