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Tecumseh LH358SA engine overspeeds- throttle inoperative

I don't have an exploded diagram to see if anything's disconnected. I've exposed the side of the engine where the throttle is. Small wire with a bend sits in a groove on a metal plate that has holes in it. Should wire go in a hole or stay in groove?

Had this same problem 2 yrs ago, and it was because the governor let go, engine overspeeded and threw rod through wall. Now, same problem but I was able to shut off engine in time. Tried starting again- same problem. Called service, they said it's a throttle adjustment. Thought I'd ask here.

Thanks,
Chuck

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  • 2 more comments 
  • typewrite343 Mar 02, 2009

    Any possibility I could send you a few pictures of what I'm seeing? When I move the throttle lever, I don't see anything attached to it moving. I do see holes in the plate that the throttle lever moves, but nothing in those holes.



    Thanks,

    Chuck

    typewriter@writeme.com

  • typewrite343 Mar 04, 2009

    Thanks for all so far. Sorry so long for a reply- I was down sick. Where can I send the photos?

  • typewrite343 Mar 18, 2009

    I didn't hear from you- figured you were busy. Is there an email I can send pix to? Something's definitely not connected right- who knows how it got that way! Couldn't get the right diagram. Was referred to Techumseh.



    Chuck

  • typewrite343 Apr 04, 2009

    I don't get your last message. I've been very thankful that you've tried to help me, but I can be a little scatter-brained at times, and didn't reply in a timely manner. Quite frankly, no snow = no thinking about snowblower as there are so many othe things that need repair here! Not an excuse, but an explanation. My apologies if you thought I was upset.

    I'm inserting images if you're still willing to help. Of note, when I took the pix, I tried firing it up for the hell of it, and the throttle worked fine. I could go from slow to fast, and it wasn't overspeeding on high. Something's getting stuck somewhere.

    Chuck

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3 Suggested Answers

  • 78 Answers

SOURCE: I have a 9hp Tecumseh engine on my Sears chipper

I will try again here.
1 wire link from the top hole in the governor arm to the throttle on the carb. There should also be a wire link with a spring that goes from the Governor arm to the speed control handle.

Posted on Oct 22, 2009

  • 110 Answers

SOURCE: I have an old tecumseh 10 hp eng model vm100. with carb problem

Rigid link to the top hole on govenor arm, spring link to second hole. If engine 'hunts', try the 3rd or 4th hole. Each lower hole will take off a few rpm, but make the engine less prone to 'overshoot' the goverened speed.

If you have not disturbed the govenor arm clamp where it fixes to the shaft that goes into the engine, that should be all you have to do if you have, proceed as follows ;-

Assemble as above. With engine OFF, loosen the govenor clamp. Push the end of the govenor arm so the carb throttle is wide open. Whilst holding it there, rotate the shaft in the same direction as the arm would have rotated it if you hadn't lostened the clamp. Ensure it's rotated as far as possible (this removes ant 'lost' movement in the internal govenor mechanism.). Now tighten the clamp and release everything. Push the speed control to FAST. The throttle should open, and it will requirer about 4 OZ of force on the end of the govenor arm to close the carb throttle. This force will be generated by the govenor when the engine is started

Move the speed conrol to SLOW. Most of the tention should disappear, allowing the throttle to close with very lettle pressure on the govenor arm.

If all this behaves as described, you should be safe to start.

Posted on May 12, 2010

  • 3 Answers

SOURCE: Garden Way "Speedy Hoe" with

The throttle cable does not connect to the carburator. The round end of the cable pushes on the throttle plate arm. The cable is spring loaded and returns when you let off the throttle. The throttle plate arm on the carb is connected to the governor- the plastic vane that fits in the slot in the engine top cowl and sticks up into the cowl- by a spring. The air that is moved by the fan on top of the engine pushes on the governor and brings the engine speed down when you let off the throttle on the handle.

Posted on Jun 16, 2011

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