please guys I am at my wits end. This motor has low hours but has sit for 2 years before I bought it. I have installed kits in the carbs.(after good cleaning)<br />changed the fuel/vro pump. This engine just will not stay running unless the primer lever is at least half open. I wouldnt say the spark is all that robust either, but dont have another to compare it to. Also it seems that the 2 center cylinders are firing much better than the upper or lower two. Spark is about the same on all. All this testing was done on muffs in 55 degree weather. thanks for any and all ideas. dave