Lawn-Boy Duraforce Throttle Control Spring Repair | How to Fix a Lawn-Boy that won't change RPM

Just a quick video showing how to repair a common problem I see on Lawn-Boy mowers powered by DuraForce engines.

[JT-slui]

I just retired my ‘03 SilverPro Duraforce after 21 great mowing seasons. The engine still runs great with a coil replacement every couple years. The steel deck isn’t even rusted. Recently, the self propel cable snapped and I was done. I wanted a lighter, newer upgrade. Done mixing gas & oil. Done with a 90 pound mower. Done with coil replacement. Done with idling issues. Got an EGO 2135SP and it’s incredible! Outperforms the Lawnboy! 👍🏻✌🏻

[johnmatacic]

After replacing the needle valve, experienced the throttle issue. The spring must have slipped out. Followed the video and now my 22 year-old LawnBoy 10324 runs perfectly. Thank you.

[bradwhite]

I was ready to give up on my lawn boy. Thanks to your video I'm good for a few more decades, at least the mower is.

[danielrobert]

Top motor speed (not to exceed 3300 RPM) should be adjusted by turning the serated collar at the base of the vane which slighly modifies the tension on the spring. Each click equates 50 RPM up or down depending on the direction one turns that collar.

[TilleyDuthie]

Great video, once I tweaked my governor spring per your instructions, everything came back to life. Thank you for taking the time to help others.

[thenewhumandesign]

Awesome video. The reassembly in particular was what I needed clarification on. Throttle was being super weird and looking at it I realized it wasn't attached to the governorspring. So it was just randomly hitting it as I played with the lever.

[IanBudge-fn]

Nice video, very clear and your explanations are excellent.

[donaldandersen]

A great video on how to check to see if the choke is working and to hook up the governor spring if it is unhooked. But after doing this, now the engine lopes which is usually a sign of running lean. I'm wondering if it's worth it to put the money into 3 air intake gaskets.

[stevenbifulco]

Your video was excellent right on the money solved my problem Thanks for the help Will keep in mind as I go along with some of your other videos

[v-g-z]

Finally a new mower video, thank you! I just don´t understand why I never get a notification when you uploaded a video... Been a subscriber for over 6 years now, and I´ve hit the bell, but nothing.

[BlisterBang]

Good video, Cap. I'm sure it helped a lot of Lawn-Boy owners. I just have a few comments that may also help your viewers:

While rebending the spring enabled you to regain throttle, you really should have done a little investigation into the spring. Did the end straighten out? Or did the bend break off and you made a new one? If you made a new one, then you changed the spring tension characteristics by, in effect, shortening the spring. By looking at the other end of the spring, you can see that it has somewhat straightened out, again losing more tension. All in all, this means for a long-lasting repair, the spring should have been replaced with a new one (they are available).

IMO, you should have cleaned up the air vane governor. It's constantly moving back and forth as you mow (adjusting throttle to maintain speed). The shaft needs to be able to turn smoothly to prevent hunting/surging; you already had it out and it would have been easy to clean it up before sticking it back in.

Lastly, I think you should have mentioned the spring tension adjuster. Some of your viewers might have separated the two, or done a few 'messing around' clicks on it.

[NickCapozzi-vlmp]

Quick question regarding the governor spring: I bought a new carb from amazon and everything fits great. However, im not sure if I bent the governor spring when I put it in or if im doing something wrong here. The problem is the spring loses tension when I pull the throttle back to slow. It then pops out of the bracket where it loops in.

Any suggestions?

[felixbouchard]

I bought duraforce 107-4607 lawn boy carburetor. When I put them on my mower it has one where the engine runs way too fast and the other the engine runs way too slow. I put the gas ket. However, before installing the carburetor on the engine everything seems to work well. The valve opens and closes. What can I do to correct these problems?

[brianeastman]

I recommend the SUNOCO non ethanol pump gas ⛽ for your Lawnboy mower, but I recommend the Briggs and Stratton 2 cycle low smoke 🛢 oil, keep up the good work man.

[vengeancenxs]

Thank you for this video! My lawnboy 10323 was having the same surging issues.

[rickokemp]

Just the sauce I need to get it fix. Thumbs up -- great footage/video.

[BuickPerformanceSupportCha]

lol the infamous Duraforce surge lol Great job Kid!!

[jessehoeper]

I want to use one of these on a custom bike I had made what’s your opinion sir?

[intotheadventure]

I have a lawn boy gold series 4.5. It revs uncontrollably. Do you know anything about these

[williamvolkmann]

The purpose of that system is the fan blowing harder slows the mower down because the engines running faster and as load it comes on with thicker grass the mower engine slows and the carburetor increases in throttle ability making it adjustable automatically as you're mowing