Used Stihl CS Help

[scratchedup]

I just got this off ebay. .046 Magnum. Can you folks help determine the condition of this saw + how to tune up for proper running/cutting.

I opened the UPS box, put the bar and blade on, made a few checks, took these pictures then fired it up. It cuts well...not great. The engine seems to bog down pretty easy but if it is up to speed it cuts well. Also it may need a little tweaking of the carb...at less then wide open it seem to hunt a bit.

THX

 

[hypnotoad]

Make sure you're running the right mix of fuel/oil. I think most Stihl stuff uses 50:1. Cool saw.

 

[The32nd]

try adjusting carb high needle if it bogs down when reving

 

[The32nd]

normally 1.5 turns out is a good starting point

 

[Milton Shaw]

Take off the muffler and clean the spark arresting screen, it's probably clogged up. Most 2 cycle motors have them to keep sparks from flying and are required in national forests. A lot of 2 cycle engines you can take them out and increase performance considerably. Carb cleaner and a fine wire brush works to clean them.

 

[cashishift]

Take off the muffler and clean the spark arresting screen, it's probably clogged up. Most 2 cycle motors have them to keep sparks from flying and are required in national forests. A lot of 2 cycle engines you can take them out and increase performance considerably. Carb cleaner and a fine wire brush works to clean them.

This, and use premium fuel with Stihl Synthetic 2 cycle oil.

looks like the piston is newer.. did you buy it with a new jug and piston?

 

[theoldwizard1]

Take off the muffler and clean the spark arresting screen, it's probably clogged up.

While you are there, use bright light and look into the exhaust port as you slowly pull the starter cord. If you see heavy lines going up and down the bore, they are scratches. If you have scratches, you likely will need to hone the cylinder and install new oversized rings.

On the other side of the engine, replace all of the fuel lines with new Tygon fuel lines and replace the air cleaner.

 

[buddyboy]

that saw you have is no joke.

I have a 440 mag and it is the best and last saw I probably will ever need to buy or own.

mine runs best at 2 speeds, idle and full throttle.

high test gas and stihl oil mixed 50:1

keep your filters CLEAN

your saw is not an entry level saw, the user should be experienced

be careful

 

[GeorgiaHybrid]

Another user with high test gas and Stihl grey can synthetic oil. I buy racing gas at a local tuner in 5 gallon cans that does not have ethanol in it and keep it sealed. Mix only what you will need in a 2 week period if possible.

Like noted above, keep the filters clean, the chain sharp and be careful. Yours is the baby brother of my ms660 and they are not for the casual user. Be careful with it and that saw will be cutting for a long time.

 

[scratchedup]

that saw you have is no joke.

I have a 440 mag and it is the best and last saw I probably will ever need to buy or own.

mine runs best at 2 speeds, idle and full throttle.

high test gas and stihl oil mixed 50:1

keep your filters CLEAN

your saw is not an entry level saw, the user should be experienced

be careful

This is what I wanted...a no joke saw.....and it is. I have been using an .025 for years and it has been great. + I'm in my fiddies now, live in the burbs, but I've been running chain saws since I was 8...never hurt myself...[yet!]

Your comment about the 2 speeds....seems to hold true. I plan on changing out all filters and fuel lines.

Just curious if from my shot of the piston can the experienced heads tell if its a good one?

Gas- I noticed driving around today a Valero Gas Station that was advertising non-ethonal gas! Gunna check that out. What about 100LL aviation gas...is this recommended?

 

[holland_patrick]

http://www.arboristsite.com/

it's where the CS head hang out you can get TONS of info there

 

[Bkf350SD]

Nice saw, I have 2 ms660's and an Ms440 and quite a few other smaller models. Great saws.

From the picture, the piston looks fine, just make sure there is no scoring on it. I would check the fuel lines to make sure there are no cracks and check the intake boot as well for cracks. If cracked replace otherwise your going to eventually burn up the saw. Make sure to run fresh premium gas at 50 to 1.

Good Luck with it!

 

[mooseracing]

I opened the UPS box, put the bar and blade on, made a few checks, took these pictures then fired it up. It cuts well...not great. The engine seems to bog down pretty easy but if it is up to speed it cuts well. Also it may need a little tweaking of the carb...at less then wide open it seem to hunt a bit.

What did the seller sell it as?

Are the teeth sharp?

Out of the cut it needs to be running rich wide open, once you are in a cut it should sound smooth. You should hear the change. Don't lean it out, or you will put a new P&C on it.

Are you over working the saw? It's not that big of a saw, what bar is on it?

 

[NUTTSGT]

A few years back, I was looking in my manual and saw the recommendation to use 89 octane gas. I never realized that about the fuel and didn't think it would make a difference. Trust me it does make a huge difference going from 87 to 89 octane.

So are you guys running 91/92 octane then ?

 

[scratchedup]

What did the seller sell it as?

Are the teeth sharp?

Out of the cut it needs to be running rich wide open, once you are in a cut it should sound smooth. You should hear the change. Don't lean it out, or you will put a new P&C on it.

Are you over working the saw? It's not that big of a saw, what bar is on it?

Sold as a used saw that runs well...was not "checked out" but stated "it was a saw that he would take out in the woods himself." He already one of these for his collection.

I'm having it checked out by a shop....apparently it was previously a fire department saw. The tubular handle goes all the way around so that when cutting through a roof it will not fall through.

It is being serviced...chain, fuel lines, filters, carb adjust...

28" bar.

 

[scratchedup]

Out of the cut it needs to be running rich wide open, once you are in a cut it should sound smooth. You should hear the change. Don't lean it out, or you will put a new P&C on it.

PLZ explain this-
"You should hear the change."

"will put a new P&C on it"

THX

 

[scratchedup]

Most 2 cycle motors have them to keep sparks from flying and are required in national forests

Can I take these out or will this cause tuning issues?

 

[scratchedup]

A few years back, I was looking in my manual and saw the recommendation to use 89 octane gas. I never realized that about the fuel and didn't think it would make a difference. Trust me it does make a huge difference going from 87 to 89 octane.

So are you guys running 91/92 octane then ?

What fuel should I run?

89, 91, 93, 100LL

 

[thadru2001]

Can I take these out or will this cause tuning issues?

You can run the saw without the spark arrest screen, it won't hurt.

Also, I'll pull my carb every so often and tear it down and clean it out with carb cleaner. Seems like the newer ethanol gas gunks up the smaller passages on the carb.

 

[buddyboy]

i use the highest octane avail at the station, to be honest I don't know what that is lol

i'm sure it's somewhere 90 to 92.

there have been times where I've had to mix up a gallon using just regular unleaded 87... ugh... I could really tell the difference.

 

[NUTTSGT]

What fuel should I run?

89, 91, 93, 100LL

Like I posted, my manual states to use 89 octane (or maybe to use atleast 89). I would use nothing less than that. Also only use Stihl oil mix and buy a seperate can just for the Stihl stuff. We use the Stihl oil mix but only 87 octane at the FD, the city isn't going to spend the money to fill their tank up with 89 octane at the garage.

I personally use only fuel from my jug and I don't want something somebody else has mixed up. I don't know what mix they use, what ratio they mixed it at or what gas they used.