steelhead
New member
Looking for an optimal pump stroke measurement. I was thinking, with all the excellent 2-stroke oils out there, maybe there's a better setting than the factory used back in the day. My pump stroke falls between the min. and max. at .028 in. ( .711mm.) If there's anyone who has tweaked the yellow dot yamaha srx 440 pumps, let's here from you. Thanks for a great site.