I put a new carb on my troy billt 31cc leaf blower. I checked for spark and cleaned the spark arrester. I try to prime it and turn it over yet the spark plug is dry as a bone. i also changed fuel lines and the fuel filter. Any suggestions? Thank you.

Hi check for compresion first

See if you have spark to the plug, if not replace coil. You did everything else it should start, make sure start switch is to the on position. You replaced carb are the lines connected to the correct places and not kinked. Is your clunk clean. not much else to go wrong. Good Luck......

Get a rebuild kit for your carb most likely a walbro carb.

Some people use an actual compression testing tool that measures psi and some people just put their thumb over the spark plug hole and pull the rope quickly and see if it pushes their thumb off the hole.

Your 31cc engine uses a Champion RDJ7Y. The gap is .020".

Hold @ full throttle and adjust high (H) screw until she raps out to max RPM, let off, if idle is rough adjust low (L) screw until idle is achieved, You should have it, if not, clean carb and check fuel filter.

CHECK THE SCREEN ON OUTPUT OF THE MUFFLER. ITS CALLED A SPARK ARRESTOR, THESE GET OIL FOULED AND MAKE EM A BEAR TO RUN . CLEAN IT UP AND SHE WILL RUN LIKE A CHAMP, THE CARB MIGHT NEED REBUILDING ,FUEL FILTER AND A SPARK PLUG IS THE FIRST THING TO REPLACE .. IF'N I WAS ANY HELP VOTE FOR ME ...THANKS.. JAY

try to keep it running on wd-40 after you get it started and sometimes it will clean-out the carbs varnish blockage,if not remove and clean or replace the carb

You may need to do a more detailed cleaning on the carburetor. I like to use a Den Tek Brush, (used for cleaning teeth), to get into the small ports. They work great for this job. You may also need to check the small screen in carb. It gets blocked with debris.If you need further assistance, please contact me.

Jim

If a small engine wont start its usually one of two problems, its not getting gas, or its not getting spark. easy way to find out if its getting a spark is to remove the plug, put it back back in the connector and just let it hang down while you try to start it. you should see a bright blue spark, if you dont try changing the spark plug. if its getting a spark come back on this site and i'll help you trouble shoot it.