Exmark Zero Turn Runs Rough, Surges & Lacks Power Full Diagnosis - Find & Fix the Real Problem! Toro

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Is your Exmark or Toro zero turn mower running rough, surging, or lacking power under a load?

We go over an issue I am seeing more and more of that is hard to pinpoint down and do a diagnostic on without having some knowledge of these issues

If it bogs down in deep grass or popping / cracking are going on and you can not figure it out even though you have done some work you will want to watch this video

In this video, we walk you through a complete, step-by-step diagnosis and repair process to uncover the real issue.

Whether you're dealing with engine surging, power loss, or rough idle, this guide will help you track down the root cause and get your mower running smoothly again.

This Exmark zero turn is powered by a private-labeled Toro/Exmark engine built by Loncin, commonly found on many Exmark Radius models and Toro TimeCutter models.

These engines are known to perform well, but like any engine, they can develop issues related to fuel, spark, or compression.

In this video, we diagnose:

Fuel system issues – fuel filter clogs, fuel line restrictions, and carburetor problems
Compression issues – including worn valves, bent push rods, or potential head gasket failure
Spark issues – testing ignition system components for proper function
Air intake leaks – ensuring the engine is breathing correctly
Step-by-step process to rule out each system and find the actual cause

After a thorough diagnosis, we discover the real problem, and you’ll see exactly how we confirm the issue and perform the proper repair to restore full power and eliminate surging.

If you're working on an Exmark Radius, Toro TimeCutter, or any zero turn mower with this Loncin built engine, this video is a must-watch.

We show how to do a leakdown test on a zero turn mower with anExmark or Toro commercial engine

This is a 708CC Exmark engine on a Radius S Series RAS708GEM603C3 They also use this engine on the Radius E series and several Toro Timecutter models

If you need a more in depth video on the fuel system see the video at    • Toro Timecutter Zero Turn Mower Not Starti...  

See the service manual for this engine at https://www.toro.com/getpub/117255

Tools Used:

Spark Check'r SPC-7200 https://ebay.us/Js5ohF
Neiko Impact Socket Set https://amzn.to/3ygAtwP
Dewalt 20V Impact Driver https://amzn.to/3z16OaE
Titan Impact Bit Set https://amzn.to/3LChxvk
Right Angle Milwaukee Ratchet https://amzn.to/3Xdfxki
OTC Leakdown Tester https://amzn.to/3FIZEvn

Video equipment:
GoPro Hero 11 https://amzn.to/48rIcVz
Microphone:
DJI Mini Mic 3 https://amzn.to/4bmNROT

Parts Used:
139-0720 Ignition Coil x 2 https://amzn.to/3RtxQgR

If you need a carburetor part number 136-7842 carburetor https://amzn.to/4aWDC1Y

Like and subscribe to see more helpful videos like this one! Save some money by doing it yourself!

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Interested in starting your own small engine repair business? Check out my other channel, where I share tips on building a repair company from scratch with minimal investment ‪@SmallEngineEdge1‬

About Us:
My name is Martin. I have been repairing tools and small engines for almost 20 years. We operate a small engine repair shop in Illinois. We service / repair Briggs & Stratton, Kohler, Kawasaki, John Deere, Cub Cadet, Toro Tecumseh, Loncin, Honda, Craftsman, Husqvarna, MTD, Troy Bilt, Simplicity, John Deere, Exmark, LCT, Generac and many more brands. We work on riding mowers, walk behind mowers, snow blowers, zero turns, generators, pressure washers and much more. We normally repair about 3,000 pieces of equipment every year and look at many more that are beyond an affordable repair. Hopefully our videos will save you some money and give you the information you need to work on your own equipment or figure out the issue at hand.

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Please be careful when repairing any piece of equipment and follow all possible safety measures. This video is for entertainment purposes only.