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Tune-up of old Tecumseh HS40


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

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  • worldwidedan Feb 23, 2009

    I gotta lot of problems for you - I'll be back!


6 Suggested Answers

  • 18 Answers

SOURCE: Karcher 2400R

You have a poor signal to the spark plug usually caused by a rusty fly wheel found underneath the pullcord casing. clean it with releasing ajent such as wd 40. common when not in use for a while.

Posted on Sep 19, 2008

  • 239 Answers

SOURCE: Briggs 6.75hp Will Not Start and it's Brand New!

you need a new had gasket or a new piston

Posted on Dec 28, 2008

  • 583 Answers

SOURCE: It looks like gas getting into the crankcase oil,

here`s the go ,good possibility that you didn`t turn the gas tap off at the last time you used it.If the needle isn`t seating properly the gas wii over flowinto the carburetterif the inlet valve is open ,fuel can ,if the macine is on uneven ground run back into bthe cylinder and over a period seep into the sump. I`ve only seen it once .I am assuming it is a GX140 motor, so dont tilt it back too far or the same thing will happen with the oil and the mufler eventually gets full and it will sm oke like a forrest fire for a month. why do you say it takes longer to warm up ?is it because you have to have abit of choke for longer ?if so it is a mixture problem .and no it doesn`t need a new spark plug.

Posted on Aug 18, 2009

  • 241 Answers

SOURCE: pull cord getting stuck

Pull starter rope wheel is Jamming against casing usually some lube n check for ware will fix it

Posted on Mar 24, 2010

  • 2 Answers

SOURCE: Press. Washer Honda engine gx 390 will not start

did you leave fuel in it from last year, if so remove all fuel from tank, drain carb. (remove float bowl if it doesn't have a drain bolt) put in fresh fuel, check your oil level and you should be good to go. if not, please take it to a qualified tech. for carb. cleaning.


Posted on May 17, 2010

SOURCE: Used my pressure washer last

Same problem happened to me after starting it on the 1st pull used it and put it away for months.The carb.has a single jet which is a very small hole that gets gummed up when its not ran for awhile due to the Ethanol that they put in gas.Ethanol adds moisture to the gas over time as it sits.After you take the and you take it apart and clean it.There is only 4 screws holding the air filter on to get to the carb.which is held on by 2 of those 4 screws.Before you take it off the motor drain the gas out of the bottom of the removing the screw in the bowl.To make sure this wont happen again do two things.1st is to add a Fuel Stabilizer called STA-BIL its red in a clear bottle.2nd dont turn off the pressure washer by using the switch,turn off the gas and let stall by running out of gas so this way your carb will be empty as you it for month at a time.I have been doing these two things since the carb.was clogged on mine 4 years ago and when its time to use it I turn the gas on wait a couple of minutes for the gas to flow into the carb.and it starts everytime I use it and always on the 1st pull.Good Luck I hope this helps did for me.

Posted on Jun 19, 2012

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