Question about Briggs & Stratton 66set Panzer Tractor Decal 6hp 1960s

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John deere riding mower backfires when starting

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That sounds like a bent pushrod to me, causing the exhaust valve not to open, and the explosion in the combustion chamber to blow back out the intake valve. Pull off the cover that says OHV on it, it should be a big silver square thing on the from Of the engine by the spark plug and will maybe have four 10mm screws holding it on. This happens when the cylinder fills up with fuel from the engine sitting for a while and the float in the carb being stuck open, common problem with lawn tractor engines.

Posted on Mar 02, 2015

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Sounds like your cylindes are not getting gas after shutting the engine down ..this happens if the engine continues to run a little after the ignition is shut off or have too much throttle when shutting down..pumping gas into the cylinder un burned..and when you try and start the unused gas is immediately ignited coming back through the intake valves and out the carb..two things let it idle diwn as low as it can and shut it down .another is to shut the fuel shutoff valve before shutting down and let the carb gas be used up..that will not allow gas into the cylinders..just remember to turn back on fir a few seconds to refill the carb bowl before starting..good luck..

Posted on Oct 10, 2014


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Posted on Jan 02, 2017

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SOURCE: John Deere 120 w/20 hp B & S engine starts but

If the moewr has been sitting over the winter without being started, the carb' may have "gummed up " with stale petrol. You will have to remove the carb bowl have wash it out with some clean parafin and dry it off. Also clean out the jets in the carb and blow them out gently with an air line if you have access to one. if you are removing the jets, not where each one is removed from and do not over tighten when re assamblin. If there is an adjustable mixture screw, carecully screw it in all the way, then back it off about 1 and 3/4 turns. if the engine stalls when reved up back off mixture screw a little more. If engine is blowing black smoke, screw mixture screw clockwise a little at a time until the smoking is cleared, test the mower under load and increase the mix again slightly if required.
hope this solves your problem

Posted on Apr 03, 2009

  • 133 Answers

SOURCE: I need a manual to show how to put on a belt on a

I don't have a diagram but it shouldn't be to hard. You will have to drop the deck. Then when installing the new belt remember to always place the inside of the belt (V) into the pulleys and the outside of the belt (flat side) up against the larger idler pulley. When you have the belt on properly it should be snug. If you have excessive play you need to try a different routing2.gif around the idler.

Good luck and let me know if this helps.

Posted on Sep 06, 2009

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SOURCE: I have a John Deere LA140 Automatic riding lawn

That should help. It's on the John Deere website.

Posted on Nov 19, 2009

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SOURCE: I have a scotts/john deere

I would try and fill the case with 50 weight oil It might be low. The hose should come to the right side of the pully door on the middle of the tractor between your legs.


Posted on Jan 10, 2011

  • 174 Answers

SOURCE: trouble with riding lawn mower

this sounds like a bent or broken key on the flywheel.this will cause it to be out of time.

Posted on Jun 04, 2009

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1 Answer

My John Deere cut off and now won't start backfires through the carburetor

Hi Vickie:
Backfire thru the carb is an indication that the timing is radically off.
Is it possible that the blades hit something like a rock or block of wood and that is when it cut off?
I'd be pulling the flywheel to make sure the alignment key has not sheared.
The other possible would be that an intake valve has failed, but I'd be betting on the flywheel key.

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roger, try a new spark plug, i just fixed a John Deere that took two days only to find out that the new plug out of the box was a bad plug. also check the fly wheel key , it may have sheered off.

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2007 riding mower John Deere backfires while trying to start will not start

Inspect/replace the air filter to ensure proper air flow.
Inspect/replace the sparkplug(s) to ensure proper firing.
Check the position of the "choke" (if equipped; & by the way, most riding lawn mowers do not use a primer bulb button to prime the engine before starting).

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1995 John Deere sabra 1438 hydro rider lawn mower won't starts just backfire.

If b and s engine. Check flywheel key. May be out of timing

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John deere will not start backfires

Key in the crank is worn. Needs new key to keep in time.

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My john deere 245 lawn tractor will not start only backfires out the muffler.

There are 2 likely problems.
First spray a prime in the carb and see if the motor runs on a prime. If it does then you need to remove your carb and clean- there is likely water in your fuel.
Second- check for a sheared flywheel key.

Dec 28, 2009 | John Deere Garden

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