Still having fast idle when engine is warmed up. Cold idle is normal.

[Rls8836]

This is exactly what mine is doing. I’ll post it here when and if I get it figured out. Warmer days are coming soon, so I’ll be doing a complete maintenance on it sometime this month.

Thanks I hope for good results.

 

[shadetree#1]

What is the model, type and code of your engine????????

As star tech mentions in post 5 the governor idle adjustments have to be correct. If you make these adjustments with a bad carb it just makes things worse.
AND
I've seen Nikki carbs have those symptoms and most generally it is the Clone Nikki's types.
Wondering if you have ever seen this engine carb combo operate correctly?
Did it just start doing this all at once or ?????????????

 

[bodean]

This happened gradually over time and seems like it’s getting worse. Nothing has been tinkered with as far as governor adjustments….only backed the idle adjustment down. I did remove , clean, and replace the intake to insure that it was sealing properly, but that was after it had already started doing this.

 

[shadetree#1]

Did I overlook where you posted this info?

What is the model, type and code of your engine????????

 

[bodean]

I think I must have overlooked the request for this information. The first vide is cold start up and run. The second video is after fully warmed up from cutting grass for 15 minutes.

 

[bodean]

I think I must have overlooked the request for this information. I tried attaching a short 25 second cold run video and a hot run video, but it won’t allow that or posting more than one still photo, so this is probably the most important one as far as engine information goes. View attachment 63367

 

[bodean]

 

[shadetree#1]

HMMMMMMM
Dual throat Nikki carb. I've seen the o-rings inside those Nikki carbs cause that engine speed changes.

I did not say that carb is your engines issue but it's a good suspect.
Here is a link to review about your 796997 Nikki carb. (repairs, etc)

Small Engine, Lawn Mower, Snowthrower Troubleshooting, Repairs and Safety

outdoorpowerinfo.com

Here is some info I have saved from my files about those type carbs FOR YOUR REVIEW.
Nikki dual throat carb repair/rebuilding links

Nikki dual throat carb tips and re-building LINK.

Guy asks about jets sizing and re-building a dual throat Nikki carb

https://www.lawnmowerforum.com/threads/nikki-dual-carb-main-jets.29187/



You tube video part 1: (newer style aluminum float bowl Nikki) USE KIT 54832 @ $7

part 2 (older model with steel float bowl) USE KIT 54833 or 54834 @ $9 each depending on the style of Nikki. See part 2 of the video to determine which kit needed.

Nikki dual throat carb repair/rebuilding links

Nikki dual throat carb tips and re-building LINK.

Guy asks about jets sizing and re-building a dual throat Nikki carb

https://www.lawnmowerforum.com/threads/nikki-dual-carb-main-jets.29187/



You tube video part 1: (newer style aluminum float bowl Nikki) USE KIT 54832 @ $7

part 2 (older model with steel float bowl) USE KIT 54833 or 54834 @ $9 each depending on the style of Nikki. See part 2 of the video to determine which kit needed.