Originally Posted by SFC_Ren
The idle mixture screw had already been unplugged and messed with. I'm setting it at two turns out from fully seated to start with. The jetting in the carb is all stock with the idle jet being #37.5 and the main jet is a #135. It seems to run well even with the airbox cutout and the cobra pipe but I suppose it should be running lean.
Thanks for the suggestions.
I'm sure some will disagree but reading the thumper treads here and on thumpertalk reveals a fairly consistent reoccurring theme for me. I think cutting the airbox or removing the lid makes a kick start single harder to start. Since a single gets only one opportunity to fire for each two revolutions there are about 540 degrees of revolution when air isn't moving through the intake tract at all. Unlike electric start that keeps air moving thru the intake repeatedly in rapid succession, the kickstarter DR350 passes thru only one intake and compression stroke per kick and there is a relatively long pause while the operator resets to kick again. Doesn't matter how hard you kick it, the gearing of the kickstarter provides only ONE chance to fire so conditions need to be right at that precise moment. I'm not sure WHY the lack of airbox resistance results in hard starting on kickstarter bikes but I'm convinced it does.