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

Sky-High RPM at Idle on FS541V

Author
tony1098
New Member
  • Total Posts : 1
  • Scores: 0
  • Reward points: 0
  • Joined: 2025/08/22 20:57:07
  • Status: offline
2025/08/22 21:05:45 (permalink)
0

Sky-High RPM at Idle on FS541V

Hi Guys,
 
I'm working on a walk behind mower with a FS541V on it. As soon as I start the engine even on cold start, the RPMs take off almost immediately. I tried to get a reading with my tach and saw anything from 5-10k rpms. This engine is supposed to idle at 1550. I'll go over the checks I've done and what I've found:
 
Compression: Even on both cylinders at 87psi (seems on the low end)
 
Throttle: all linkages are free and the butterfly valve works as it should
 
Choke: all linkages are free and the choke valve works as it should
 
Governor: all linkages/springs are in place and moving freely. Governor has resistance when I manipulate the throttle by hand
 
Air leaks: No large leaks detected (carb spray trick around carb, intake, and intake manifold)
 
Any suggestions? Next steps will be governor adjustment and high/low side adjustment tomorrow, just seems like the engine speed is SO far off. 
 
Thanks in advance!
 
 

1 Reply Related Threads

    SRTsFZ6
    Super Member
    • Total Posts : 2486
    • Scores: 80
    • Reward points: 0
    • Joined: 2018/11/18 07:20:58
    • Status: offline
    Re: Sky-High RPM at Idle on FS541V 2025/08/23 07:33:24 (permalink)
    0
    Sounds like your INTERNAL Govenor failed. 
     
    Access to that will very likely be the next step.
     
    https://www.partstree.com/models/fs541v-fs19-kawasaki-engine/valve-camshaft-11/
     
    https://www.partstree.com/models/fs541v-fs19-kawasaki-engine/ 
     
     
     
    .

    Scott
    Jump to:
    Copyright © 1994 - 2016 Jacks Small Engine & Generator Service, LLC
    © 2025 APG vNext Trial Version 5.5