Scag tiger cub running rough

[Chieftm2]

Hey guys, I will add some pictures tomorrow. Long story short. Got a free tiger cub. Has an almost brand new Briggs & Stratton 27hp professional motor on it. Really solid machine. Some how someone removed the chock lever and integrated it into the throttle lever. Why would they do this? Is it because the original engine wasn’t a B&S so there were some compatibility issues? So now all the way forward would be choked and slightly back would then be full throttle. It had new coils put on it last year. But it’s running rough. Under powered and spits like it’s choked. I’m slightly mechanically inclined and can get things done once you kind fellas point me in the right direction lol. I’m going to check the rpms tomorrow. But not sure what to do otherwise. Should I try to figure out how to get a real choke lever back in there? What kind of pictures do you guys need to be able to help? Thanks in advance.

 

[WinterDeere]

For most of the Briggs engines, there are multiple throttle plate options. So look up your engine and see if you're able to swap it over to a throttle plate that would be more compatible with your mower controls.

That said, just stopping the throttle short of the position where it closes the choke should work as a temporary measure. The Briggs Intek on my log splitter has this type of throttle plate, and I just throttle it up to where the throttle arm touches the choke actuator, but doesn't depress it. That's easy on a log splitter, but maybe not so easy with the engine hiding behind you on a mower.

 

[Chieftm2]

If I’m stopping the throttle short of it closing the choke it seems like it’s way under powered. Do you think this is a governer issues (low rpm’s) or related to the hack of a fix someone put on this thing? Really appreciate your insight.
Going to do done research on the throttle plate options as soon as I get home today