I recently purchased my first 4 stroke engine. I bought it used and do not have the manual for it. I did download the manual from the saito website but cannot find the answere to my question. Anyway here goes. Do Saito's normally have "vent nipple" in the back of the crankcase? I don't know if that makes sense or not but mine has the nipples for the carb, and muffler but I am not sure what the crankcase nipple is for. Any help would be nice thanks.