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Small Engine Tuneup (Tecumseh HS50)

Hello,

I have an old Toro 421 with a 5HP Tecumseh HS40-55531 3F.

Engine wouldn't start at all when I got it.
I replaced the carb and it then it took off on the second pull.
I'm trying to tune it up and I'm looking for specs on things such as spark plug choice/gap, point gap setting, oil type/capacity.

Here's what I've been able to gather so far:

Points 30547A
Condensor 30548B

Any help would be appreciated:

Thanks, Dan

Posted by on

  • worldwidedan Feb 23, 2009

    Thanks Jerr! - Very helpful

  • eric4brs Mar 02, 2009

    tecumseh 5hp snow blower stalls when I put load on engine how do i tune it under load

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5 Suggested Answers

  • 15 Answers

SOURCE: briggs and stratton lawnmower 4horse power engine needegap specs on coil and points

That's easy man! You will always hear, "You sir, need to gap this or that at EXACTLY .00071542 inches per square meter".

The actual "poor boy fix"-

Put your magneto back on there, and stick a business card from your wallet in between it and the rotor. Let the magneto pull itself to it, you center it, and give it just a hair of breathing room (to slide the card back out). Tighten 'er down, and you got it.

1.- If you can't pull the card out, it is too tight.

2.- If you pull the card out easily, too loose.

3.- JUST enough to pull it out, and have it drag just a bit on the way out is JUST ENOUGH!

Remember, on 4-strokes, they ARE forgiving, and can do miracles even if you try your best to destroy them.

Posted on May 30, 2009

panilling9
  • 284 Answers

SOURCE: 4.5hp Sears/Tecumseh motor starts and dies in 5 - 10 seconds.

metal or plasic float?

Posted on Jun 21, 2009

garing
  • 998 Answers

SOURCE: My 550 series Bolens lawnmower won't start. When

keep pushing the prime button

Posted on Aug 08, 2009

rwvanlue
  • 375 Answers

SOURCE: Still no fire , toro 8/32 briggs stratton engine snowblower

Repair Manual (Antique) - CE8069 for engines built prior to 1981

Point setting should be .020" after they are full open. I am nut sure that TDC will give full open.

Armature/coil air gap should be 'the thickness of the cardboard' of the box it came in.
*note: the coating on the wire from the coil to the points should be sanded off where they connect to the points.

The voltage coming from the coil is DC and may be as much as 8,000 to 15,000 volts. You WILL know it when it has spark, as in, you may have to change your underwear if it sparks and you are touching the end of the wire.

The 'afterthought' is that an electronic coil could have been mounted to eliminate the points to aid in a sharper spark and easier starting.

Final note: make sure all snwoblower frame wiring and switches are working correctly, as this can 'kill' the spark.

Posted on Nov 11, 2009

rycgl
  • 1545 Answers

SOURCE: I have a Toro super recycler model 20017 with a

Make sure that the doggone brass bolt that holds the carb bowl on was cleaned as well. It is the main jet and has tiny holes that get clogged from evaporated fuel/varnish and debris (if no inline fuel filter is used). It has holes on the bottom and the smooth part of the sides...it needs to be clean and shiny! If all is well and the motor is an OHV, then maybe the valves need adjusting.

Posted on Sep 14, 2010

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The Toro 38080 was made from 1979 - 1993.

With it not producing a spark then you have an ignition system problem. Depending which Tecumseh HM80 engine setup you have you may have either an internal ignition system or external. By this I mean under the flywheel or external to the flywheel. There was also hybrid system that was both internal and external.

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