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Kohler 5E, initially water pump impeller no good causing overheat and shut down of motor (overheat switch killed ignition), replaced raw water pump impeller, heat exchanger stays cool, exhaust manifold seems hot to me (by touch, maybe 180-200 deg), engine runs great under load for 10-15 min, then starts to backfire through carburetor, if you shut the main breaker on the gen-set off, it runs smooth again, put under load and runds bad. It seems like a fuel issue (lean under load), but I don't know if it has overheat sensors that would start to switch and make it run bad. Thanks for your help

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Hi,
You did not say what fuel you running the motor on??? It sounds like it may be LPG or Propane.... is so then it seems as though you do not have enough surface for evaporation...

heatman101

Posted on Jun 15, 2011

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A few things to check:
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service factor must match old motor ! motor must match impeller hp rating ! .. get the numbers off the impeller and search it on the web.. bet your motor is too small.. the easy fix ? buy the right impeller for your motor.. the things you need when buying a impeller are as fallows.. your motors hp and SF .. thats the service factor ! if the voltage is 120 v the motor set on 240 it will jump back and forth between start and run.. it will make a click ..click ..click noise .USE A VOLT METER. I smell a northstar a real pain of a pump.. REMEMBER TO BUY AMERICAN PRODUCTS (PLEASE) AND SUPPORT YOUR LOCAL POOL PUMP REPAIR GUY.. AND GIVE ME A THUMB OR TWO ,IF;N YA FEEL I WAS OF HELP ..JAY FLORIDA

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