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PLEASE HELP -- Ferris ISZ Power Loss

lichtd's Avatar

Join Date: Jun 2008
Posts: 1

06-09-08, 07:35 AM   #1  
PLEASE HELP -- Ferris ISZ Power Loss

I need some help. I have an older Ferris ISZ 61" deck with a Kawasaki 23hp engine. What is happening is that after 5 minutes, when the engine has warmed up, of load (blades engaged) the power drops off significantly. To the point that the engine almost stalls. When I disengage the blades, the motor revs right back up. Also, the engine has developed a backfire when I back off the throttle. Here is what I have done so far:

1) Rebuilt the deck (New spindles, pulleys, spring, belt, blades)
2) Rebuilt the carburetor
3) New fuel pump
4) New battery
5) New electric clutch
6) New plugs
7) Good compression
8) New muffler
9) Good fuses
10) New fuel filter (Installed correctly)
11) New and correct air filter

From this point forward, I don't even know what to look at??

Could it be a sticking valve, dirt in the fuel system, clogged exhaust, a bad hydraulic pump????

Please HELP.


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cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,570

06-09-08, 09:47 PM   #2  
Sounds to me like it's not getting the fuel needed to bog into the load. You might spend some more time with the carb or put on a new one. Try choking it a little to see if that helps it take the load better. If so, the carb is the problem.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

french277V's Avatar

Join Date: Mar 2006
Posts: 4,808

06-10-08, 12:04 AM   #3  
I am leaning more to carbuator issue there either main jet is clogged up a little otherwise the govener is not set up right { that is possible }


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