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Alan Barber Posted on Sep 18, 2013
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I have a craftsman tecumseh 4.5 hp mower throttle free type and i have cleaned and rebuilt the carb replaced the carb mounting gasket between the carb and intake and also replaced the o rings on the plastic tube and replaced the needle the needle seat and the bowl and nut gaskets It runs but surges and never revs to full speed only runs a little over idle Any suggestions and thanks very much for your help and advice here

1 Answer

L&D Small Engine Repair

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  • Expert 212 Answers
  • Posted on Sep 19, 2013
L&D Small Engine Repair
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Joined: Jun 09, 2013
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I have a craftsman tecumseh 4.5 hp mower throttle - 1ec7ba32-45ac-4b07-8389-f863014e42da.jpgIt still sounds like a carburation issue. Are you sure all jets, vents and ports in carb are open? Another possibility is that the governor setting is off. The governor is the rod that comes out of side of engine and connects to throttle linkage on carb. To set governor to factory setting, push governor linkage in direction that opens throttle valve, loosen screw on governor arm and turn rod in same direction until it stops, while holding in this position tighten screw on governor arm. This is called a static setting. If this doesn't work I would disassemble carb, remove all plastic and rubber parts and soak in carb dip overnight. Picture may be different from your unit but it shows governor linkage to carb. Good luck and happy wrenching!

I’m happy to assist further over the phone at https://www.6ya.com/expert/layne_0fccff498c319c32

3 Related Answers

Anonymous

  • 109 Answers
  • Posted on Apr 17, 2009

SOURCE: lawn mower running problem

There are no adjustments for the carb., however, in the bolt that holds the bowl on, there is a small hole in the threads that must be clean in order for it to run right. It is a real small hole on either the 3rd or 4th thread from the top.
Hope this helps

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casa_innuend

  • 1 Answer
  • Posted on Jun 16, 2009

SOURCE: mower surging

let it surge, it will usually get better as it warms up. These 6.5 Hp engines are fine except they have an cheap badly designed carburator. Nothing can be done about this problem. They all surge eventually.

Joseph

  • 66 Answers
  • Posted on Oct 10, 2012

SOURCE: 13 hp tecumseh riding mower won't start unless gas is poured into carb. removed the bowl from carb has a wire snap holder float and needle and seat works OK and all passageways seem to be clean

hi
remove the bowl again and get the centre jet out and lok very closely use a jewlers eye piece you wll find a passage that is plugged on the side of the jet look around it you ll see some sign of a hole that is not clear through its pretty small use a welders torch cleanng tool with various size rods use very thin one dont make the hole bigger

Joe

Testimonial: "thanks for the ideas on fixing my problem I'm going over to my neighbors on Sunday and I'll try out your suggestions thanks again Al"

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13 hp tecumseh riding mower engine surges when mower is not engaged. It runs well when mower is engaged

"Govenor hunting" caused by a lean condition ,carb is starving for fuel ! Dirt in carb or water,or out of adjustment ,or leaking throttle shaft ....usually it is a plugged low idle passage,that causes this condition,and is almost impossible to remedy,but a good cleaning might help .....does it only governor hunt at low idle ? If so thats the issue !
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Oh318 (tecumseh) Runs for a few minutes then cuts off. Starting fluid makes it run for a few sec. then it cuts off again. replaced whole bowl assembly. Cleaned carb in carb cleaner. Blew it out. Checked...

Fuel Starvation - Float Bowl Carburetor
1) remove air filter assembly
*be cautious of tearing the mounting gasket. If it does tear, you HAVE to replace it. It is part of the priming system
2) remove the float bowl fastener. This is the main jet
3) carefully remove the float bowl, the rubber o-ring/gasket will not be able to be used if it is removed, you WILL have to replace it
4) using a spray 'carb cleaner'
spray up thru the center of the carburetor
spray and clean the main jet with cleaner and 'tag' wire
(tag wire is very thin, and can be used to clean the hole in the center of the main jet)
5) clean any debris from inside the bowl or carb body
6) re-install bowl and center bolt, air filter assembly

*if you need gaskets, your Briggs dealer can supply. The kit is cheaper than individual gaskets, and all the parts needed to finish the above repair are in the kit.

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

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I have a 9hp Tecumseh engine on my Sears chipper vac. I rebuilt the carb and forgot how the governor and throttle linkage hooks up. Could you send me a diagram showing what holes these linkages go in? The...

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.
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Hi have a handy mower with tecumseh engine new plug ,oil,clean filter fires on first pull ,then cuts out any advice would be great thankyou kevin

If the carburator mounts on top of the gas tank take it off and replace the gasket and diaphram between the carb and tank. If it does not mount to tank,clean the carb and install new needle and seat valve.
Aug 11, 2009 • Garden
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Engin will not stay running dies

No fuel filter but there is the air filter. Try removing the air filter and starting the mower. If this works replace the air filter. If not, then check the engine's carb. Engine was made by Tecumseh. There aren't many parts to a Tecumseh carb so replacing the few parts (gasket around bowl, float, needle and seat) isn't a lot of trouble.
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I recentley bought a Craftsman 4.0 HP mower at a yard sale, tested it before taking home and it fired right up. It did run a little rough so I replaced the air filter & spark-plug. Once again it fired...

You need to disassemble the carburetor and spray the with carb. cleaner. Make sure all small debris is out. Ckeck any gaskets for signs of ware. If they look bad, replace them; your carb. could be sucking air if so. Also check the fuel filter to see if gas is flowing through it.

Jim
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