For as long as I can remember, both of my DS 90 2 strokes, 01 models, have been very hard to start after sitting idle for more than a month. It takes jumper cables or big charger and running electric starter for 3 or 4 minutes, then wait, then again, then wait, etc etc. when start, very weak. can't push gas for few minutes until warmed up. once started, great machines and start every time 1st crank,,,,,if ran recently,,,last few days,,,,shop keeps fixing, and charging and no change in problem after sitting....like for 4 or 5 months on bad season like band, or hockey, or soccer etc. I am very mechancally inclined and the only reason I took to shop was time shortage and maybe to learn the trick after they repaired. HELP.