Being a newbie ... I started out by checking compression, all cylinders seem to be around the 105 to 110 max area. I've replaced fuel tank lines and bulb to make sure I wasn't getting any air leaks, as well as a new Mercury style fuel adapter at the engine. I've pulled the Carbs and soaked those ... not much to them, replaced needle and seats & gasket set ... floats set to level w/ fuel bowl edge, turned upside down to have slight pressure on needle was how I checked the height. These Carbs have no idle adjusting screws, so jets pre-determine fuel quantity. I haven't done anything with the fuel pump. Spark plugs have been replaced and don't have any carbon build up. Not familiar with checking the timing on this - being an ex-car mechanic, this is a bit different. This Mariner is on a 21' Misty Harbor (square pontoons) and will push it wide open about 22 - 24 MPH per Lowrance Speed. But I haven't been able to get it to idle and I don't want to tear my lower unit out with having to put it into gear at a faster idle. Thanks for any advice anyone may have! Lanny
