View Full Version : 16 horse kawasaki motor reving help!!!

08-31-2009, 09:04 PM
Hi i have a scag mower with a kawasaki FH480V KAI motor its a v twin 16 horse with 145 hours on it. The motot will randomly rev high and low, sometimes it runs fine and sometimes it will start changing rpm levels. Its almost as if when a mower runs out of gas it wil start reving up and down and almost want to stall out. I changed both plugs, fuel filter, oil filter and oil last week and it still has done it since. what could be causing this? with only 145 hours on the motor i wouldnt think i should be having issues yet thanks for the help in advance!!

08-31-2009, 09:32 PM
MAybe the fuel pump?

08-31-2009, 10:09 PM
MAybe the fuel pump?


Sounds like you may have some trash in the carb (main jet)......

Give this a try;

Take the carb. off then tear it down, Spray carb. & choke cleaner with the straw through ALL ports, passages and jets then blow it out with compressed air if available then re-assemble, Check/clean the fuel tank and flush/replace the fuel hose and install a new fuel filter.

It only takes a cup of dirty fuel to mess a carb up, So hours used mean nothing in a case such as this.

09-01-2009, 12:07 AM
Ok thanks ill give it a shot, hopefully it will fix it i have lawns to cut, sometimes i have to just keep mowing when it acts up

09-02-2009, 11:09 PM
Well did you get it fixed?

09-04-2009, 08:45 AM
I cleaned out the carb, im going out for 8 hours of grass cutting today i wont know until i get out there for the full day some days it will act up some days it wont. but hopefully this fixed it