I have a series 51 husky saw. it starts and runs normally until it gets up to operating temps. then it stalls out and either refuses to restart or just won't restart until it cools down again. ideas/suggestions?

Does it immediately restart or is there an extended crank to start it back up? Is the check engine light on? If so, have the codes scanned to see if any problem areas have been found by the computer. A cold engine requires more fuel and as the engine warms up, fuel is trimmed back/reduced by the computer. You may have a vacuum leak causing the stall/dirty throttle plate/ or it could even be an electrical issue to/from a sensor

Many things could be your problem
1- coolant temperature or wiring defect
2- Cooling fan not working
3- Need to retrieve any engine faulty code with a scanner.
4- With a scanner look for any data that is not normal.
See a good auto technician

Hope it helps.

Do you have a check engine light on ? If so Get codes first for a direction. Sounds like temp sender or coolant component is faulty.

sounds like your auto choke is stuck on had the same problem with a honda i worked on would be fine untill got to running temp then would run like **** and stall out and wouldnt start again till cold

Check the fuel filter for plugging. Check the fuel lines for decay or other damage. If the cap vent was stalling the machine, removing it should allow about a minute or so of running before it quit again. Hope this helps!

With small 2 stroke engines, it's either a spark problem or it's a fuel problem. In your case, it's definitely a fuel problem.

It could be you have a drop or two of water in your fuel or in the carburetor. Put a bit of HEET (methanol) in your premix, it'll take a while to dry it out if this is it.

Check the air cleaner element. If it's dirty, clean it with carb cleaner or gasoline or similar. If it's missing entirely, this is likely the problem, it won't run properly without a filter element, as it requires a slight drop in pressure to create a vacuum to **** fuel out of the carburetor.

Also check the fuel line for a gap or crack. Either will cause it to do what you're describing.

If you still didn't get a hit, take the carburetor off and carefully clean it. It doesn't take much of anything foreign to make it wig out.

Hope this helps.

If it stumbles at full throttle, the fast (high) idle screw is set too rich. Using your owner's manual, locate the high idle adjustment and back it off in very very small increments. Do this until the saw will run wide open without stumbling.

You don't give us a model or serial number, nor the age of your saw. Has it ever been tuned by a chainsaw mechanic? A tune up replaces the spark plug and a few other items. It includes a visual inspection and perhaps a pressure test or two. The final thing is to adjust the carburetor for better operation. My Husky 359 gets tuned about every 3 years by the local Stihl dealer at a cost of $40. I have a Husky dealer closer to me but I prefer the Stihl mechanics.
Heat is an indication your saw may be lean, in extreme cases it causes metal transfer from the piston to the cylinder wall and can destroy your saw. It should always be operated with a clean air filter.
The one thing you might try is once your saw attempts to stall is to rotate it enough to loosen the fuel cap. If it smooths out your fuel vent is plugged.
You can find an Operator's Manual and IPL here:
HusqvarnaUSA.com
http://www.husqvarna.com/us/homeowner/support/download-manuals/
Enter the 3 digit model number (no XPs, Es, just the numbers)
Serial number decode – for use with IPL
06 1500198
06 = year produced – 2006 (single digit before 2000)
15 = week produced - March
00198 = 198th unit Husky produced that week
I'm concerned about the heat, If my saw the local Stihl dealer would have it. Explain the problem you are having it may aid in repair or diagnosis.
HTH
Lou

first try changing the coollant temp sensor

All chainsaws are air cooled. The problem is the cylinder head often sits underneath the gas tank. People fill their tanks with a mixture of gasoline and oil and often spill it or overfill the tank causing that oily mixture to coat the cylinder often. Then all the saw dust and dirt sticks to the oil and pretty soon the cooling fins on the cylinder head and all the parts surrounding it are coated with an oily dirty grime that keeps air from circulating around the cylinder head letting it cool normally. I'm not that familiar with a Husky but you need to be careful about other parts in the area, but you need to clean off the cylinder head so that it can get some cooling and quit heating up the gas in your tank. Usually there is a vent in the gas cap also and if it's plugged it will cause the gas tank to pressure up and force more gas than is necessary into the carburetor. Either clean the vent or buy a new gas cap.