i have a couple 627a twin engine scrapers i just got. all four engines start right up real good. all have 3306 engines. the problem is when the fronts are under load they smoke [black] like banshees and dont put out. i did oil change and primary fuel filters to no avail. in park they smoke off idle smooth out until 3/4 petal and smoke heavy black. i checked the screw in sediment bowl screens one had shavings in it. the other did not. the one with shavings can hardly pull it self around. but it runs good. these machines sat @ 3 years. Thanks any advice?
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