Question about Mtd LAWN MOWER PART # 683-04163B FRAME Assembly:RIDER

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Tecumseh 12.5 ohv engine decompression valve isnt working. How can I fix it?

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Posted on Jan 02, 2017

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SOURCE: I have a Tecumseh 12.5 hp vertical ohv engine

My 13.5hp ov358ea is .004 both valves. Would like to know model of your engine. I want to replace the non-adjustable carburetor of my 13.5hp ov358ea with an adjustable carburetor.

Retired Airline Mechanic

Posted on Jun 27, 2010

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1 Answer

I have a petrol golf cart wont start


Brian, If engine is of overhead valve type and engine turns over with plug out and will not crank when plug in or turns very slow, the problem is probable valve adjustment required or decompression release faulty on cam shaft. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www.kohlerengines.com/maintenance/basicTroubleshooting.htm
briggs and stratton ohv hard start crank fix
How the compression release mechanism works on Briggs and Stratton OHV...
HOW TO ADJUST VALVES FIX HARD TO START Lawn Tractor with OHV Briggs Engine...


Aug 16, 2016 | Cars & Trucks

1 Answer

Par car golf cart wont start


Brian, check valves for proper adjustment, if they are OK then problem could be decompression cam/valve faulty. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
How the compression release mechanism works on Briggs and Stratton OHV...
HOW TO ADJUST VALVES FIX HARD TO START Lawn Tractor with OHV Briggs Engine...

Aug 16, 2016 | Golf

1 Answer

Sorry on way 1st question went engine has new gas-fuel filter,line carb taken apart cleaned-starter taken apart wheel is engaging sanded and cleaned flywheel-magneto for sparkplug cleaned and working


Either the valves are out adjustment or the decompressor has failed.

Most OHV valves valve clearance open over time causing the decompression system to become in effective; however, the decopressor fails and even properly adjusted valves will still will not decompress the cylinder for starting.

I just repair a B&S 310000 series that had so much compression that the engine would even complete a cycle. After checking the valve adjustment I found that the decompressor on the cam had failed.

May 12, 2015 | Electrical Supplies

1 Answer

Why is my Briggs and Stratton mower dragging? It won't turn over fast enough to start


If it is an OHV engine the valves are needing adjusting normally as the decompression system quits working causing high compression at start-up speed.

Apr 02, 2015 | Garden

2 Answers

Hard hitting on compression stroke when starting


Most Briggs deco vaves are internal and pretty reliable, the valve clearances are very important, if the exhaust valve clerance is too wide the valve lifter will not work, if there is no adjustment yoy would have to fit a new service valve and re do the clerance by removing material from the valve stem

Jan 02, 2014 | Briggs AND Stratton Intek Briggs &...

1 Answer

Have a 12 hp Tecumseh engine that bvackfires with ohv


Your problem could be one of several things.. A bad spark plug, bad gas, failure to lower the idle and let it run a few seconds prior to shutting it off, unadjusted valves, etc.

I'd start with the plug and some fresh gas, then go from there. Always idle the engine down for a few seconds before shutting it off. This allows all the gas in the combustion chamber to be burned up preventing backfire.

Jan 14, 2012 | Tecumseh Enduro Vertical Engine 16 HP 1in...

1 Answer

Tecumseh 16 hp ohv adjustment


It is always best to have the exact model number of the engine you want to work on. Here is a helpful link:http://www.tecumsehpower.com/CustomerService/BSI.pdf

Jul 03, 2010 | Tecumseh Enduro Vertical Engine 16 HP 1in...

2 Answers

Husqvarna LR130 burnt out starter


it has one but the way to fix it is to adjust the exahust valve thay should know that thats is how to fix that now the reason you cant find any thing on this is becous tecumseh is out of buisness thay have been out since 2008 i hope this helps you if not call me and ill help ya 918-7281822

Mar 06, 2010 | Husqvarna Garden

1 Answer

Tecumseh 17.5 hp ohv engine won't start


check valve clearance. if ok you going have change carb.sometimes i rebuild a carb everthing seam ok but carb wont work right so i have get a new carb and it works fine evertime

Jul 20, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

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