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Bad day...but a bit lucky


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#1 poncho62 ONLINE  

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Posted October 23, 2011 - 10:51 AM

Yesterday, I was out rounding up leaves with the STX38, when it went to full throttle and wouldnt come down to idle....Looked at the linkage etc and all looked OK....Started it this morning, same thing....All of a sudden it started knocking like it threw a rod.......&%#$@*.........:mad2:

Took it apart, got the carb off and the throttle shaft was broken, and a plate screw missing.....Pulled the head, and there she be, jammed into the top of the head......Luckily, the valves look OK .....Guess it slipped through....

Now, I have to go find a used carb....I doubt if a dealer sells just the throttle shaft.

#2 KennyP ONLINE  

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Posted October 23, 2011 - 11:38 AM

Sorry to hear that. But it's good it didn't hurt other parts. Hope you find a carb soon.

#3 Gibby OFFLINE  

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Posted October 23, 2011 - 01:43 PM

Try this guy. --> Carb Rescue - Specializing in the restoration of obsolete, vintage carburetors. Walbro, Kohler, Zenith, Others.
  • poncho62 said thank you

#4 JDBrian OFFLINE  

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Posted October 23, 2011 - 02:09 PM

I've heard of this happening to others as well. I guess we should check those throttle plate screws whenever we do work on a carb.

#5 caseguy OFFLINE  

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Posted October 23, 2011 - 07:12 PM

Sorry to hear about your troubles Poncho. At least it's not as bad as it could be! The place where I get my general parts from, the local lawnmower repair shop, usually has stuff like your throttle shaft. The hardest part is getting the shaft that matches your set-up. Best of luck on the repairs.

#6 Alc ONLINE  

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Posted October 23, 2011 - 07:42 PM

I've heard of throttle screws come out be not the shaft breaking !!!!! Hope you can find parts to get it going again soon , Al

#7 grand OFFLINE  

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Posted October 23, 2011 - 09:29 PM

Sure hope this is an easy fix Poncho. Maybe Gibby's site can be some help. Keep us posted.

#8 sgtrock1976 OFFLINE  

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Posted October 24, 2011 - 05:30 PM

3" to 6" of snow forecasted for Tues/Wed in Denver area. Hope it doesn't happen to me

#9 poncho62 ONLINE  

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Posted October 24, 2011 - 05:56 PM

Went out and found a used carb today for $20, ordered a head gasket.....I put a head gasket on it last year and it shows signs of failing......Took the head into work so the guy in the machine shop can have a look at it.....looks OK to me. Will get it back together on the weekend I guess.

#10 caseguy OFFLINE  

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Posted October 24, 2011 - 11:13 PM

It seems it doesn't take a lot of deviation to cause a head gasket to fail prematurely. Hopefully he finds it to be OK or an easy shave to fix! Glad you found the carb pretty cheap too!

#11 KennyP ONLINE  

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Posted October 25, 2011 - 06:24 AM

Hope all goes well with the repairs. You may need to check the top of the block just to be sure there is no problem there. Usually not, but doesn't hurt to run a straight edge and feeler gauge across it. Just be sure to warm it up good and re torque it. I usually go a bit higher than spec with used bolts/threads.

#12 mjodrey OFFLINE  

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Posted October 25, 2011 - 07:05 AM

Yes that happened to me a few years ago on the Onan in my Massey.




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