I have a remax eb7000 that runs perfect.....once I can start it. It used to start fairly easy using the standard redmax routine: crack throttle/choke/prime/pull. Now if it hasn't been running very recently and has even slightly cooled down it will take maybe 5 minutes to get it started, if it starts at all. I am a very good mechanic and have worked on 2 strokes for a long time but can't figure it out. All gaskets are tight, spark arrester out since new. No carbon buildup on exhaust port. Good spark, good fuel filter and air filter, same fuel as all my other equipment that starts easy. Good compression, no cracked fuel lines. Is there a diaphragm in the carb that would only affect starting but not running condition? Is this a common problem with older redmax blowers? It is the only redmax I own . This problem forced me to go with echo 650's instead. All of our echos start very easy no matter how old they are.