i have recently become involved in boating as an extension to the fine passtime of fishing. aquired a boat (5,5m - 18.5ft) with two suzuki dt50's. upgraded to two evinrude starflite 85hp V4's (ID plate had been sprayed over so i dont know the vintage). the v4's are extremely low on power when in the water. it seems that i do not get the full rev rage required to put the boat into plane as had been the case when the suzuki's gave a good performance the day. i then went through the following checks;<br />1. compression test indicates a pressure of 700- 800 kpa (i thnk 115-125 psi) not excellent but should be acceptable?<br />2. carburetter jets unobstructed and butterfly valves horizontal when full throttle.<br />3. there seems to be good spark at the plugs.<br />4. i found a tube connected to the carb cover. is this a vacuum pipe and what does it do?? it was clogged. could this have any effect?<br /><br />the info following would be appreciated;<br />1. possible causes of the low power. what else should i be looking for.<br />2. schematic diagram of wiring. especially rev counters and temp gauges if these motors are equipped with these. as these motors have probably been through a few owners, the wiring loom has been through a few revisions as well. information on the wiring would have to be from source in order for me to trace and make sense of.<br />3. what should the timing settings be. does one connect the strobe pick-up to HT lead 1?<br />4. what is the recommended rev range of these engines.<br /><br />so,, what do you think??<br /><br />ps. outboard engines are very expensive here in south africa. new engines are the furthest thing from my mind.
