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Weed whacker rough running / stalling problem #5404463 04/15/20 09:01 PM
Joined: Sep 2015
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JeepWJ19 Offline OP
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Hey all!

I have a 2010 CubCadet weedwhacker/trimmer that I fixed this past winter that's been out of service for the past 5+ years. This used to be my father's favorite trimmer but the upper driveshaft housing/tubing broke where it snap/clicks into the lower housing. He stopped using it for a Hitachi WeedWhacker/trimmer which I got one too and they are nice and durable!!!

He said I could have the CubCadet and we both had the idea to lend it out to people who could use one. So I fixed it over the winter and decided to give it its first test today.

Well, it ran rough, and could basically only idle, emitting white smoke (could have had blueish tint but I didn't really take special note). Whenever I applied throttle it would increase RPM but the whole trimmer would violently vibrate/shake, and if I gave it enough throttle it would completely stall out.

I thought it was due to old gas so I let it idle out until it stalled from no more gas. And so I put in my two stroke gas in it but it still ran the same. Idle pretty rough, violently vibrate/shake with a little throttle, and stall out with a lot of throttle.

The head does spin freely, I even disconnected the head of the trimmer and rotated the driveshaft with my fingers and could feel no clear resistance or jumps/skips etc. Rotating it by hand it was smooth.

My two stroke gas did sit over winter but my Poulan Leaf blower, Hitachi string trimmer, my restored 2000 Barracuda Weed Eater, and my chainsaw all ran fine on the same gas.

The gas is 87 octane and ratio is 50:1. The CubCadet calls for 40:1, haven't read the manual yet if it called for higher octane. I didn't think there would be too much harm or difference running 50:1 in it just to see if it could trim some lawn edges so I'm here asking you guys what could be the potential issue?

Should I take the spark plug out, sand it off a little to see if there is even a minor amount of improvement?

Thanks for the help!


2002 Jeep WJ 4.0L 158k miles
2016 Ford Fusion 2.5L 32k miles

Software Engineer :]
Re: Weed whacker rough running / stalling problem [Re: JeepWJ19] #5404473 04/15/20 09:11 PM
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nwjones18 Offline
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Time to clean out or replace the carb.


2016 Ram 1500 5.7 Hemi 30k QSUD 5w-20 Mopar filter
2008 Honda CRV 125K QSUD 5w-20 Fram ultra
2007 Mazda 3 2.3 130k 5w-30 syn-blend Denso filter
1988 F-150. 4.9 I6 251k. 10w-40 QSHM Motorcraft FL1A

Re: Weed whacker rough running / stalling problem [Re: nwjones18] #5404474 04/15/20 09:13 PM
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JeepWJ19 Offline OP
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Originally Posted by nwjones18
Time to clean out or replace the carb.


*Sigh* I was REALLY REALLY hoping that was not the case lol


2002 Jeep WJ 4.0L 158k miles
2016 Ford Fusion 2.5L 32k miles

Software Engineer :]
Re: Weed whacker rough running / stalling problem [Re: JeepWJ19] #5404477 04/15/20 09:15 PM
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ripcord Online Content
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Since the last issue was mechanical damage to a rotating assembly, I would look there first. Check the trimmer head for anything funny, or out of balance. Check the clutch and make sure everything is lined up correctly.

Re: Weed whacker rough running / stalling problem [Re: JeepWJ19] #5404478 04/15/20 09:16 PM
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nwjones18 Offline
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Originally Posted by JeepWJ19
Originally Posted by nwjones18
Time to clean out or replace the carb.


*Sigh* I was REALLY REALLY hoping that was not the case lol


We all do hope that's not the case.. haha. I'm sure the fuel lines will need to be replaced at the same time. The little carbs are usually very cheap on ebay/amazon.


2016 Ram 1500 5.7 Hemi 30k QSUD 5w-20 Mopar filter
2008 Honda CRV 125K QSUD 5w-20 Fram ultra
2007 Mazda 3 2.3 130k 5w-30 syn-blend Denso filter
1988 F-150. 4.9 I6 251k. 10w-40 QSHM Motorcraft FL1A

Re: Weed whacker rough running / stalling problem [Re: nwjones18] #5404481 04/15/20 09:20 PM
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Randy_R Offline
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Bad gas. What did you eat?


2018 Mazda CX-5 10000 miles Zepro moly 0W-20 Mazda filter
08 Saturn VUE AWD 3.5 V6 70,000 miles Schaeffer 9000 5W30 Wix 51522XP
65 Pontiac Tempest 355 Chevy Schaeffer Racing 10W30 Wix 51061
Re: Weed whacker rough running / stalling problem [Re: ripcord] #5404486 04/15/20 09:21 PM
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JeepWJ19 Offline OP
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Originally Posted by ripcord
Since the last issue was mechanical damage to a rotating assembly, I would look there first. Check the trimmer head for anything funny, or out of balance. Check the clutch and make sure everything is lined up correctly.


The driveshaft itself was fine, it was just the upper tubing/housing that wouldn't snap into the lower housing/tubing. It has one of those stupid push in type bolts/heads that clicks it into place so it's attached to the lower housing. Apart from that, no drive line damage or replacement was needed.


2002 Jeep WJ 4.0L 158k miles
2016 Ford Fusion 2.5L 32k miles

Software Engineer :]
Re: Weed whacker rough running / stalling problem [Re: nwjones18] #5404488 04/15/20 09:24 PM
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JeepWJ19 Offline OP
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Originally Posted by nwjones18
Originally Posted by JeepWJ19
Originally Posted by nwjones18
Time to clean out or replace the carb.


*Sigh* I was REALLY REALLY hoping that was not the case lol


We all do hope that's not the case.. haha. I'm sure the fuel lines will need to be replaced at the same time. The little carbs are usually very cheap on ebay/amazon.


Yes, my restore of the 2000 barracuda leaf blower took a new carb. The most painful part was a discontinued carb and had to eyeball a $14 cheap one off Amazon that looked similar. Said screw it, pulled the trigger and for the most part it was a direct fit, just a minor design change.

Wasn't looking forward to doing that again lol


2002 Jeep WJ 4.0L 158k miles
2016 Ford Fusion 2.5L 32k miles

Software Engineer :]
Re: Weed whacker rough running / stalling problem [Re: Randy_R] #5404489 04/15/20 09:25 PM
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JeepWJ19 Offline OP
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Originally Posted by Randy_R
Bad gas. What did you eat?



Buffalo chicken, black beans, and rice. Yum.


2002 Jeep WJ 4.0L 158k miles
2016 Ford Fusion 2.5L 32k miles

Software Engineer :]
Re: Weed whacker rough running / stalling problem [Re: JeepWJ19] #5404491 04/15/20 09:30 PM
Joined: Apr 2020
Posts: 219
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ripcord Online Content
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Originally Posted by JeepWJ19
Originally Posted by ripcord
Since the last issue was mechanical damage to a rotating assembly, I would look there first. Check the trimmer head for anything funny, or out of balance. Check the clutch and make sure everything is lined up correctly.


The driveshaft itself was fine, it was just the upper tubing/housing that wouldn't snap into the lower housing/tubing. It has one of those stupid push in type bolts/heads that clicks it into place so it's attached to the lower housing. Apart from that, no drive line damage or replacement was needed.

Can you try to run it without the attachment to see if the vibration goes away?

Re: Weed whacker rough running / stalling problem [Re: ripcord] #5404496 04/15/20 09:34 PM
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JeepWJ19 Offline OP
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Originally Posted by ripcord
Originally Posted by JeepWJ19
Originally Posted by ripcord
Since the last issue was mechanical damage to a rotating assembly, I would look there first. Check the trimmer head for anything funny, or out of balance. Check the clutch and make sure everything is lined up correctly.


The driveshaft itself was fine, it was just the upper tubing/housing that wouldn't snap into the lower housing/tubing. It has one of those stupid push in type bolts/heads that clicks it into place so it's attached to the lower housing. Apart from that, no drive line damage or replacement was needed.

Can you try to run it without the attachment to see if the vibration goes away?


Yes, I will try that for you tomorrow. Thanks for the suggestion


2002 Jeep WJ 4.0L 158k miles
2016 Ford Fusion 2.5L 32k miles

Software Engineer :]
Re: Weed whacker rough running / stalling problem [Re: JeepWJ19] #5404657 04/16/20 06:03 AM
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pbm Offline
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I went through these kind of issues with my weed whackers for years.....last year I bought a 40V battery powered one and I'll never go back to gas powered.


'Journalism is Dead'
Re: Weed whacker rough running / stalling problem [Re: JeepWJ19] #5404702 04/16/20 07:16 AM
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Zaedock Offline
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I wish you were closer as I have two Snapper whackers I'd give you for parts.

Ethanol is the culprit in my case. Runnings and Tractor Supply sell a regular pre-mix and a pre-mix called "mechanic in a can" that has worked for an old chainsaw.
That might help your whacker as it still runs. Apparently this stuff eats the ethanol goo and cleans the lines.

For me, my company uses Dewalt everything, so I bought a Dewalt electric weed whacker and never looked back. It has two speeds and the battery lasts a long time.


2019 Escape EB AWD/2016 KIA Optima SXL 2.0L Turbo/2012 F150 Ex-cab 5.0L
1992 YJ "The Heep"/2015 Chrysler 200 Limited
1975 Ford Bronco/1959 Willys CJ5/Tube Rock crawler / John Deere 750 Tractor
Re: Weed whacker rough running / stalling problem [Re: JeepWJ19] #5404857 04/16/20 09:31 AM
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gonefishin Offline
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I'm not saying this is your issue but it never hurts to check the flame suppressor screen. I had one that was running rough and tried all the obvious stuff to fix it. Finally figured out the screen was so clogged it caused it to run rough.

It doesn't hurt to check it/clean it. https://www.ereplacementparts.com/r...tor_Screen_on_a_Small_2Cycle_Engine.html


2015 Cadillac SRX
2014 BMW 528i
2004 Chevrolet Trailblazer 4.2
1969 Chevy Camaro
Re: Weed whacker rough running / stalling problem [Re: Zaedock] #5404872 04/16/20 09:40 AM
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JeepWJ19 Offline OP
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Originally Posted by Zaedock
I wish you were closer as I have two Snapper whackers I'd give you for parts.

Ethanol is the culprit in my case. Runnings and Tractor Supply sell a regular pre-mix and a pre-mix called "mechanic in a can" that has worked for an old chainsaw.
That might help your whacker as it still runs. Apparently this stuff eats the ethanol goo and cleans the lines.

For me, my company uses Dewalt everything, so I bought a Dewalt electric weed whacker and never looked back. It has two speeds and the battery lasts a long time.


Thanks, I have a tractor supply right down the road so I will make sure to take a look next time I'm out. This will probably be one of the first things I use as it's one of the simplest.


2002 Jeep WJ 4.0L 158k miles
2016 Ford Fusion 2.5L 32k miles

Software Engineer :]
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