The Jack's Small Engines Forum - Join Our Online Community
Reply to post

How does choke actuate; Briggs Stratton 3.5hp 121702 3132-01 89121305 on Snapper 21357B

Author
scarlislek
New Member
  • Total Posts : 5
  • Scores: 0
  • Reward points: 0
  • Joined: 2025/06/25 15:45:04
  • Status: offline
2025/07/02 16:27:51 (permalink)
0

How does choke actuate; Briggs Stratton 3.5hp 121702 3132-01 89121305 on Snapper 21357B

I have an old Snapper mower with B&S 3.5hp engine that I am working on. See attached picture. It has a carb that has a throttle mechanism/linkage that should engage and disengage the choke, but I can not figure out how it works.  See image.  The yellow arrowed linkage should engage the red arrowed choke.At first I thought the black plastic choke top (red arrow) was broken.  But the few parts diagrams I see - it looks okay. So I wonder if the throttle piece (yellow arrow; has two metal arms) is missing something. Any and all help appreciated.

Attached Image(s)

2 Replies Related Threads

    Thesmallenginehobbyist78
    New Member
    • Total Posts : 3
    • Scores: 0
    • Reward points: 0
    • Joined: 2025/06/26 07:03:00
    • Status: offline
    Re: How does choke actuate; Briggs Stratton 3.5hp 121702 3132-01 89121305 on Snapper 21357 2025/07/03 18:20:03 (permalink)
    0
    Here's a diagram for your engine but the linkages don't look the same to me?? https://www.partstree.com/models/121702-3132-01-briggs-stratton-vertical-engine/controls-4/ 
    In this parts list it shows a choke lever and spring (Part # 494218) which would move the clutch.
    https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/briggs-stratton/briggs-stratton-engine/100000-19z999-series/121700-to-121799/121702-3132-01   The lever would not be practical on a lawnmower (As they are usually controlled by a choke cable you can move from the operating position). Do you know if the engine is original? Is this a riding or push mower? Good Luck!
    scarlislek
    New Member
    • Total Posts : 5
    • Scores: 0
    • Reward points: 0
    • Joined: 2025/06/25 15:45:04
    • Status: offline
    Re: How does choke actuate; Briggs Stratton 3.5hp 121702 3132-01 89121305 on Snapper 21357 2025/07/03 19:40:51 (permalink)
    0
    Thanks "Thesmallenginehobby" for the reply.  I saw that parts diagram and agree the parts do not like identical.  And regarding that spring - it may be missing ... but I'm not sure where it would connect.  The weird shape of the choke control top is really throwing me.  But I've look at other carbs an eBay and they have the same shape.
    It is the original engine and it is from a Snapper push mower.
     
    If all I'm missing is the spring - I could get one - but I'm at a loss as to where to connect it.
    Jump to:
    Copyright © 1994 - 2016 Jacks Small Engine & Generator Service, LLC
    © 2025 APG vNext Trial Version 5.5