346xp hesitation

[o8f150]

I tried doing a search and didn't find anything,,, I am referring to my 346,,, it is a 2011 or 2012(if I remember right),, bought it brand new, run 1 tank through it and sent it to randy,,,it runs fantastic except for 1 thing,,, if I let it idle for lets say 10 seconds it will hesitate when I try to spool it up,,, I get no hestitation if I am doing some fast limbing,,,, high side is at 14000 and low side is about 3200,,,, low side is set rich enough that I have no hesitation when it is bone cold,,,i am running 90 octane none E in it with echo power blend at 45:1,,, the first few tanks I was running 93 ethonol octane but if It set for a while I would drain and run it dry,,, I may be wrong but I believe it has the walbro carb on it,,, I will be more then happy to pull the cover to find out for sure,,, any ideas from the experts,,,

 

[treesmith]

Do you tune it when it's warmed up to operating temp?

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[o8f150]

Do you tune it when it's warmed up to operating temp?

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yep,,, I always let my saws warm up for a couple of minutes,,, make a cut or 2 and double check the tune

 

[spike60]

It must be that dang Auto-Tune! (Couldn't resist )

Still think the lo might be a tad lean. As it's idling, it's starving for fuel. 3200 it a bit high on the idle also. Try opening up the lo and letting the idle settle in at 2700-2800 and see if that helps.

 

[sunfish]

Low side maybe too rich?

Mine have a little hesitation when cold and none when warmed up.

 

[sunfish]

It must be that dang Auto-Tune! (Couldn't resist )

Still think the lo might be a tad lean. As it's idling, it's starving for fuel. 3200 it a bit high on the idle also. Try opening up the lo and letting the idle settle in at 2700-2800 and see if that helps.

Or this.

 

[Termite]

Low side maybe too rich?

I think you might be right, Rich and loading up with fuel.

 

[sunfish]

I think you might be right, Rich and loading up with fuel.

Yep & shows after idling for a bit.

 

[dozerdan]

Low side maybe too rich?

Mine have a little hesitation when cold and none when warmed up.

Most of the 346's that I set up will hesitate when cold. If yours doesn't hesitate cold but it does when it gets warm I would say its rich on the low side.

Later
Dan

 

[o8f150]

ii think you guys might be right,,, after about 5 seconds the rpms will drop about 300-400 or so,, I didn't tach it though,, but they do drop,, that's when it will hesitate,,,,, if it doesn't drop it won't hesitate,,,, I will lean it out today to where I get a bit of hesitation when it is stone cold,, set idle at 2700 and see what happens

 

[SawTroll]

Most of the 346's that I set up will hesitate when cold. If yours doesn't hesitate cold but it does when it gets warm I would say its rich on the low side.

Later
Dan

Hmmm - does that really fit with the idle rpm being as high as 3200?

 

[sunfish]

Hmmm - does that really fit with the idle rpm being as high as 3200?

He just has the idle adjusted too high.

Or an air leak...But doubt that.

 

[o8f150]

He just has the idle adjusted too high.

Or an air leak...But doubt that.

I pretty much ruled out air leak,,, I can lean the low side out after warm up and get the rpms to drop to almost until it dies then richen it back up to a smooth idle

 

[sunfish]

Just trade in on a 550xp AT...

 

[o8f150]

Just trade in on a 550xp AT...

I thought about that but the only way I would is if they use the same bar mount,,,, that 550 is one sexy saw,, but then I would have to send it to randy like I did the 346

 

[SawTroll]

I pretty much ruled out air leak,,, I can lean the low side out after warm up and get the rpms to drop to almost until it dies then richen it back up to a smooth idle

How about tiny cracks in the fuel lines?

Assuming not, this made the most sense to me:

......
Still think the lo might be a tad lean. As it's idling, it's starving for fuel. 3200 it a bit high on the idle also. Try opening up the lo and letting the idle settle in at 2700-2800 and see if that helps.

...but I am not an expert....

 

[sunfish]

I thought about that but the only way I would is if they use the same bar mount,,,, that 550 is one sexy saw,, but then I would have to send it to randy like I did the 346

Same bar mount & Randy knows what to do... But I'd rather have the 346 myself.

 

[blsnelling]

No hesitation when cold? Your definitely rich on the low side. Tune your saw for warm operation. It doesn't stay cold. The 346 is probably the most cold natured saw there is.

 

[o8f150]

ok,,, I leaned out the low side about 1/4 turn,,,,, idle is between 3000 and 3100,,, she likes it there,,,, high side is 13900,,,,, still no cold hesitation but the hesitation is cut by about 75% now when warmed up,,, I just bucked up a 30 foot elm log and kept checking everything and most of the hesitation is gone now,,, going to wait until it cools off completely and try again and see what happens

 

[nmurph]

Yep, rich and fuel pooling in crankcase. Sometimes these carbs will wear out and the only way to stop this is by notching the throttle plate a little.

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