PTO bogs motor down when engaged. I need help.

R

Ru4him

Active Member
61" Ferris IS3000Z Water Cooled FD731V Kawasaki 25hp. This motor only starts on full choke and highest rpms. The PTO also only works when engaged with the highest rpms. This problem just started. When I engage the PTO the motor dies. If I quickly shut off the PTO and engage it again it works but the blades aren't spinning fast and the motor is chugging down. I took the belt off and tested the pulleys and spindles. All spin freely and no wobble. With the belt off, the PTO engages just fine and spins without wobble. Any ideas what could be going on?
 
Focus on the engine running problem. Most of the time it is a lack of fuel delivery. Dirty carb, trash and or water in the fuel tank. Shot in the dark, a non venting fuel tank cap. Fuel lines degrade internally so you can't see problems with them until they choke the flow off.
 
What type of fuel can spout do you have and use? Open top or closed with o-rings like these?

Far right spout is a no-go failure.

Middle spout is good.

You can buy spouts using your old can.

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This favors a cylinder that is not producing power. These engines do not vibrate due to internal balancing and they are solid mounted.

My guess would be spark plug or coil. It may also be a dropped pushrod, and a valve is not working.
 
slomo said:
What type of fuel can spout do you have and use? Open top or closed with o-rings like these?

Far right spout is a no-go failure.

Middle spout is good.

You can buy spouts using your old can.

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I use the middle can. Engine is clean. Deck is scraped and wire brushed. Why would it run normally one day and not the next?
 
For the same reason you might be breathing one day and not the next.
Things dont give a warning they just happen.
I have to go with the rest, dirty carb, filter.
 
the next thing would be to look for a vacuum leak. There are engines that have, for example plastic intake manifolds, that can crack. The symptoms you have listed are either lack of fuel or too much air. Bad fuel acts the same as lack of fuel. See if the engine runs better with the choke partially on. Also - a clogged main jet can cause that too, as can debris, a clogged fuel filter, etc.. I would also run a compression test on both cylinders because sometimes low compression can show up as mixture problems. At low compression the air molecules are farther apart.
 
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