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I have a Scag 72'' 35 hp mower. When I engage the blades I lose most of my power. I need help. Thanks

Thats the V twin Briggs... I am sure it can't be anything dragging that engine down in the deck... so there can only be a few things on the engine that can cause that ...

The Mechanical Compression Release not returning after starting, I think this would be noticeable without the load of operating the deck...
Restricted fuel or air flow???
How is the sound of the engine without a load?
From idle to full throttle how is the sound??
By the way WELCOME to this Forum... the Scag group is getting Bigger... :smile:KennyV

KennyV said:

Thats the V twin Briggs... I am sure it can't be anything dragging that engine down in the deck... so there can only be a few things on the engine that can cause that ...

The Mechanical Compression Release not returning after starting, I think this would be noticeable without the load of operating the deck...
Restricted fuel or air flow???
How is the sound of the engine without a load?
From idle to full throttle how is the sound??
By the way WELCOME to this Forum... the Scag group is getting Bigger... :smile:KennyV

Click to expand...

Runs strong and sounds good without blades engaged. I did change fuel pump. Thanks

KennyV said:

Thats the V twin Briggs... I am sure it can't be anything dragging that engine down in the deck... so there can only be a few things on the engine that can cause that ...

The Mechanical Compression Release not returning after starting, I think this would be noticeable without the load of operating the deck...
Restricted fuel or air flow???
How is the sound of the engine without a load?
From idle to full throttle how is the sound??
By the way WELCOME to this Forum... the Scag group is getting Bigger... :smile:KennyV

Click to expand...

I hope I am replying to this the right way? Do you think it is a cyclinder?

I know I must not be doing this right just found reply thread. Engine sounds good starts right up. Only when blades are engaged do I lose power. Thanks

One thing I can think of as a posibility is a dirty air filter -- it may not even look dirty, but sometimes an engine will run fine until under load and it needs more air and can't get it because of a dirty filter. Might not be the problem, but check it out ! :biggrin:

The engine will go from idle to full throttle rapidly and it sounds right while doing it...?

When you engage the deck and increase the throttle?

Do you get dark or black exhaust at full throttle with blades engaged? ... ?:smile:KennyV?
Check the main/power jet in the carb... it may have something partially plugging it?

Yo KennyV..... I just posted a HELP on the Scagg forum...... take a look. I am in a ditch.

KennyV said:

Thats the V twin Briggs... I am sure it can't be anything dragging that engine down in the deck... so there can only be a few things on the engine that can cause that ...

The Mechanical Compression Release not returning after starting, I think this would be noticeable without the load of operating the deck...
Restricted fuel or air flow???
How is the sound of the engine without a load?
From idle to full throttle how is the sound??
By the way WELCOME to this Forum... the Scag group is getting Bigger... :smile:KennyV

Click to expand...

Engine sounds great no problems. When I engage blades engine power just drops.

Mine was doing the same thing it was a bent push rod
Replaced it and is a little better still lacks power when blades are running

Finally got it going. Wow, it was a killer though. It was a combination of things. One of the 2 aluminum mounts where the right side coil attaches was broken and causing the flywheel magnet to see a different air gap as the motor was running. Lucky it did not wreck. I fabricated a steel bracket and attached it to the intake manifold where one side of the coil mounts and the other side of the coil still used the original mount. The way I discovered it was when I was in desperation and decided to swap the coils...... and when I took off one of the 2 mount bolts the coil with the broken "leg" fell off in my hand. Crazy.