One thing to check with the primer bulb are the two screws that hold the air filter box to the carb. the nearest one seals the primer circuit. if it is loose, or the threads a little chewed up from being taken apart, it'll suck air and make priming/starting difficult. Remove the screw and apply a little dab of liquid teflon sealant to the threads. Do not use teflon tape. Under 60 degrees outside and mine needs about 10-20 seconds of slight throttle until it's warmed up. temps above that, it starts and idles no problem on 1-2 pulls. I also just posted a little thread about how to make an adjustable jet with a more common $10 Tec carb repair kit. It's in the GY-6 under 150cc forum (until the mods move it to the correct one--my bad) HF&GL
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