If it is the model you it is a fix jet model, no hidden adjustment. You need to resize the main jet a few hundredths of a mm. Resize in baby steps. The main jet is part of the fuel retaining bolt. I had to this to several engines on garden tillers.

Entire Thread
Subject	Posted By	Posted
Briggs Quantum Mixture adjustment	Tyler	02/05/19 12:14 PM
Re: Briggs Quantum Mixture adjustment	AVB	02/05/19 09:05 PM
Re: Briggs Quantum Mixture adjustment	Tyler	02/05/19 10:38 PM
Re: Briggs Quantum Mixture adjustment	AVB	03/05/19 02:08 AM
Re: Briggs Quantum Mixture adjustment	AVB	04/05/19 11:49 AM
Re: Briggs Quantum Mixture adjustment	Tyler	05/05/19 05:23 AM

Moderated by bigted, Bruce, CyberJack, Gadge, Mr Davis

Link Copied to Clipboard

April
M	T	W	T	F	S	S
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30

Newest Members

Ess, Greg1402, archernar, The Grasscutter, Bob Jensen
17,924 Registered Users

Forum Statistics

Forums145

Topics13,080

Posts107,356

Members17,924

Most Online40,124
Apr 13th, 2026

OutdoorKing Showcase

20 Bucks from FB Marketplace
by Return Rider, February 20

Victa Cortina 2 Shed Find
by Return Rider, January 25

My Rover Baron 45
by Maxwell_Rover_Baron, April 16

SHOWCASE - Precision Mowers - 2021
by CyberJack, April 14

SHOWCASE – Atco Rotary – Paul C - 2020
by CyberJack, December 28

HOME |CONTACT US

Responsive Width:

PHP: 8.3.30 Page Time: 0.150s Queries: 18 (0.143s) Memory: 0.6249 MB (Peak: 0.6419 MB) Data Comp: Zlib Server Time: 2026-04-17 08:00:30 UTC
Valid HTML 5 and Valid CSS