I'm new to the power boating world and need some advice. I just bought a "72" 15.5' Invader, Stallion Tri-Hull with a ?"72"? 70hp Johnson hanging off the back. I ran it for about 5 min.(with water intake hookup) before buying and it seemed to run well. The engine was serviced last fall and has set over the winter. There was quite a bit of bluish exaust while running. Is this normal?? What should I look for when I finaly run it for an extended period the first time? Any big problem areas for this year/size that I should keep my eyes open for? Can anyone tell me the aprox. speed I should expect out of this set up? Any help appreciated. If repairs needed is o.k. as paid only $800 for boat, trailer, motor and elec. trolling motor-all in good condition.
Blue exhaust is normal. Your fuel/oil ratio should be at 50:1 (one pint of quality TCW-3 two stroke oil to 6 gallons of gas). When you run it you should be able to touch the engine naer the spark plug and hold your hand there for a count to five. You might want to inquire if the impellar was changed last year. Good policy is at least every 2-3 years chenge them. Speed? Well that is tough to judge unless you have a tachometer and GPS. At a guess w/o knowing the weight and prop about 25-27 mph.<br /><br />Bob