engine rev is too low

[Bram]

Hey Guys,

New here, but been looking on this forum a lot the lat few days, since i've got a problem with my Stiga Villa riding mower.
It's got a 12 hp Briggs and stratton engine, model: 285707 type: 0143-01

i've recently ot it from a guy who said it didn't run well since he drove it untill the fueltank was empty.
So first thing i did when i got it home was cleaing the carb.
After this i put some new fuel, spark plug and a new air filter in and got it started.
But it only runs at a low rpm, even with the throttle fully open.
and the exhaust got hot, smoke coming off of it hot.

So than i went a bit further, cleaned the carb again, no difference.
Took the head off, to adjust the valves, they were both too tight so i had filed some off until the gap was right.
Put it all back together, new gaskets, new fuel lines, tried it again, still runs at too low rpm.
i don't get it, the throttle cable works, it opens the carburetor fully, the choke works (although it won't start with the choke on)

Anyone got a clue where else i have to look for a problem?

 

[Romore]

Sounds like it might be too rich. Is the throttle wide open when it tries to rev up? The air bleed holes in the brass emulsion tube may be plugged.

 

[Bram]

I've put a video on YouTube, where you can see and hear it run.
This is with the throttle fully open, no choke.

 

[Bram]

Weird part is that it is not trying tot rev up, this is all it is giving.
But when i try to engage the mower blades it Just can't get them to turn.
Rpm goes down and it shuts off, with some loud bangs from the exhaust.

 

[bertsmobile1]

Pull the flywheel and check the timing key
Sounds like it is out of time.

 

[Bram]

Thanks, i'm gonna have a look at that.
Btw, the camshaft is good.
I Read in another topic about a bad camshaft so today i had a look at it, nothing wrong there.

 

[Bram]

Bertsmobile1

You were right, the flywheel key was broken, and the flywheel was way off.
Fixed it, put back together and she runs like a dream!
Thanks for the help!