Chainsaw Tuning 101

[blsnelling]

I thought I'd try and compile all the threads and vids I've done showing how to tune a chainsaw.

Tuning a 3120 with an adjustable carb.


Demonstrating a MS440 tuned a little too rich, then leaning it out.

http://www.arboristsite.com/community/threads/video-how-to-tune-a-chainsaw.113538/

Checking the H tune on a 350, 4-stroking at WOT.


Checking the tune in the wood on the same 350.


Checking the tune in the wood with a 346XP.

http://www.arboristsite.com/community/threads/checking-your-tune-in-the-wood.154314/

 

[demc570]

a+.........thanks nice work,thank you

 

[SCHallenger]

It's always good to go over this stuff & "refresh our ears". Posts like this from a master of tuning are music. Thanks Brad!

 

[fuzz1500]

Perfect vids ! Makes it very easy to understand Thanks for them !

 

[Raganr]

Great videos. I would like to see one where you start from scratch on a rebuilt carb and do all three adjustments.

 

[Ozhoo]

Great job. The best take-away that people can get from this is learn how engines SHOULD react when you adjust a carb. If it doesn't react as it should, then STOP and figure out what's going on.

 

[The Ripper]

Ran all vids at same time, really couldn't get a heads up with all the noise

Good stuff though!

 

[KingDavey]

This is something I've always been confused about. I set my saws to "just" clean up when they have a freshly sharpened chain and are self feeding. But I always wondered if they were lean when pushing on them? Never had scoring, but more power(leaner) is always better. Thank you Carb Control/Autotune/M-tronic.

 

[mr.finn]

very helpfull Brad, thanks for posting.

 

[LowVolt]

Looks like someone is trying to rebuild AS to its former glory.

 

[blsnelling]

Tuning is always a topic so thought I'd put it all together in one easy to find source.

 

[Hinerman]

The 346 sounds like it is on the edge....am I correct? By that I mean maxed out RPM on he high side.

 

[Adirondackstihl]

Hope it's okay if I put Mitch's vid up too

 

[KenJax Tree]

The 346 sounds like it is on the edge....am I correct? By that I mean maxed out RPM on he high side.

Thats the way a 346 likes to run.


Sent from my Autotune Carb

 

[blsnelling]

The 346 sounds like it is on the edge....am I correct? By that I mean maxed out RPM on he high side.

It's still 4-stroking and is fine there. However, if going out for a day of cutting, I would richen it up so as to not have worry about it going lean.

 

[Hinerman]

Thats the way a 346 likes to run.


Sent from my Autotune Carb

HA, I will have a 346 some day. I am not great at tuning so I am paranoid about it. I like to hear my saw burble a time or 2 in the cut,,,then I know I am not too lean. As I get more comfortable with tuning a saw I will feel better about getting max RPMs.

 

[Duane(Pa)]

Err on the rich side and your saws will live a long time. Err on the lean side and you will be looking for parts suppliers and advice on tearing down your engine, cleaning off aluminum transfer etc. Remember, cold air contains more oxygen and requires more fuel to stay in tune. CCW on the H screw.

 

[Coldfront]

How do I know if my 372xp has a limiting coil? And if it does what difference does it make if my saw is not modified? Does the limited coil make it sound like it is 4 stroking at 13500rpm? without runing a little fat?

 

[blsnelling]

Limited husky coils are blue, unlimited ones are black. When on the rev limiter it does sound similar to 4-stroking, making it more difficult and dangerous to tune a limited saw at WOT. You must tune them in the wood. Even them it can be a pain.

 

[hardpan]

Very important video collection. Thanks Brad.