Gents,<br />I've a 1989 Thundercraft with abovesaid motor and it just stopped cranking. Symptoms--when key is turned to start, engine makes a sound like it is trying to turn over (a chunk sound) and then nothing. Engine does not turn after that. First, I tried jumping-no worky. Got a new battery but same result/symptoms. Then I swapped the starter and mounted solenoid but same result/symtoms. Tried screwdriver across solenoid too but same result/symptoms. <br /><br />Boat has run excellent all year and just had it out last weekend for a day of skiing and no problems. Cooling gauge read fine and so did oil pressure. Boat sat in yard covered all week (no rain) but now it will not start. <br /><br />My level of expertise is I used to restore jeeps with mild engine maintenance and I know aircraft engines very well. Not too indepth I can handle. Have a repair manual for the engine also. Any help/ideas/suggestions would be greatly appreciated. Thanks!