I am running a 12 YO Merc 150 Optimax on a 19 Triton Fish & Ski...(about 3500#)....almost 600 hours....one bad piston....other problems happening more often...thinking about replacing with a 4 stroke....a mechanic told me that the new 115 Merc 4 stroke would out perform the motor I now have....I have always heard that the 4 stroke is slow on the hole shot but otherwise is OK...how do you think the 115 would perform....I only do crappie & bass fishing....not necessarily looking for speed or power, just dependability.....might cost around $9500....