3120 XP will not start when warm

[Bill G]

I have a 3120 XP that will not start after it has been ran for a few minutes. It will start fine cold and run good will running. When I finish a few cuts and shut it off it will not start again for some time. It is not getting hot, it has fresh mix, and it has a good spark plug. I am sure the problem is something simple but as for now it has me stumped. Any suggestions ?

Bill

 

[StIhL MaGnUm]

I had a very similar problem with a friends Husky 61 and come to find out it was the coil on it's way out,might be something you want to check out..


later Rob

 

[HomeDelight Man]

Hello, I think Magnum has a good idea, it has happen to me also!

 

[GeorgeWLogger]

Hello,

I had the very same problem with my 066 Mag and it was directly related to the coil. The gap was set incorrectly and the saw would start right up cold and run until the first time I shut it off. It would not restart until it was cold again. I reset the flywheel to coil gap to a setting that I cannot remember (.025)........ Dennis G provided me the correct setting. Anyways the saw started and has not missed a beat since.

GoodLuck!!!

GeorgeW

 

[chainsawworld]

bill,
the problem you discribe is unique and can not be repaired. the best thing you can do is sell me the saw at a reduced price and put it towards another saw. i'll pay fo the shipping to ease the impact of your grief. just kidding. begin by checking the ignition tolerances. also, it may be possible that when the coil heats up it becomes weak and can not deliver adequate spark across the plug gap. did you try a new plug?
always start with the basics when working on saws. ignition, if you have that check fuel delivery. finally compression. check one at a time so you don't scratch your head wondering which one it was. more internal trouble can be better diagnosed by an experienced saw mechanic. marty

 

[don]

You have my vote

Short in the coil that won't arc when hot

 

[eyolf]

Quick guess that (sometimes) helps diagnose feeble ign: Fat, hot blue-white spark is desired condition at cranking speed, Thinner, but still blue maybe OK, but red or yellow...just won't fire under compression.

Next time it won't start, check the spark; what may be barely adequate at operating speed may not be enough to fire at cranking speed.

 

[Acer]

Originally posted by eyolf
Quick guess that (sometimes) helps diagnose feeble ign: Fat, hot blue-white spark is desired condition at cranking speed, Thinner, but still blue maybe OK, but red or yellow...just won't fire under compression.

Next time it won't start, check the spark; what may be barely adequate at operating speed may not be enough to fire at cranking speed.

Some people keep a test plug for checking spark strength. Instead of a .020" electrode gap, they'll increase it to something like .15" (I might be wrong with the gap size here..seems a little big..). If a spark can jump that gap at atmospheric pressure, it will jump a .020" gap under compression.

 

[Treeman14]

I vote for the coil

My 3120 is on its third coil. They last about a year or two.

 

[MasonGrey]

I have a Husky 272xp that I bought used from a small engine shop that does the same thing. Do you guys think it may be the same problem? Also it seems to bog down pretty easily when I put it in the wood. The chain is not super sharp. Dont know if that would have anything to do with it??

 

[StIhL MaGnUm]

It very well could be the same problem (coil),as for the bog it probally just needs a little carb adjustment and a good sharp chain whatever you do DON'T cut with a dull chain it's just killer on the saw and yourself...

Later Rob..

 

[oldmanmcculloch]

<font color = red>Ignition Problems

<font color = blue>Bill
<p> Check your wires (blue kill wire and plug wire).Also check the plug connector in the boot(goes on sparkplug) by pulling the wire while watching the coil inside the boot. These wires will break due to vibration.Switches also are a trouble area on this saw.Lastly replace the coil. If the saw is a '96 or newer your in luck. the coil is guaranteed for life.Your local Husqvarna dealer will replace the coil.If any questions on warranty contact Husqvarna USA.
BEST OF LUCK
MAC