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John Deere 318 won't start backfires through the carburetor

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 69 Answers


ok, since you have the points, I assume you have the B43g Onan
engine. Was it running before the new parts were installed?
Check your point gap and make sure it is .016, plugs ahould be gapped at .025 Make sure your plug wires are good too. Should be somewhere between 0 and 10,000 ohms per foot, when measured with an ohmmeter. Once everything is rechecked for gap distance, make sure there is no spark by pulling plug out, leaving wire on and ground the outside of plug to the chassis of the tractor.
Crank over and look for the spark. Coils are about $100, so you want to eliminate everything else first.
Diagnosing a points ignition for no spark is really simple. Do you have 12V at the coil? Do you get a spark when you connect and disconnect the negative terminal of the coil to ground? If not you have a bad coil.

Posted on May 19, 2009

  • 986 Answers

SOURCE: 3020 carburetor ? john deere gas tractor, 3020

those carbs are real simple you will not have any problem

Posted on Jul 29, 2009

  • 77 Answers

SOURCE: 1981 John Deere 317 carburetor screws for the

When it comes to carb adjustmant,my recomandation is for you to seek a professional to do it for you. You can fight with it for a while and not get it,small engine mechanics that do it all the time could have your problem fixed rather quickly and wouldnt charge you much,but thats up to you.

Posted on Aug 09, 2009

  • 197 Answers

SOURCE: john deere 318 wiring diagram I replaced an bg 316

Purple wire goes to the solenoid on starter.If you installed starter with single wire post all you have to do is mount a solenoid to the frame just in front of starter,existing batt/starter cable goes to one solenoid post,purchase a short red cable and install on other solenoid post and run it to the starter,plug purple wire into new solenoid and the way you go.

Posted on Nov 16, 2009

Testimonial: "This was great advise bought a solenoid and away i go thx"

  • 430 Answers

SOURCE: my john deere 245 lawn tractor will not start only

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.

Posted on Dec 28, 2009

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2 Answers

How do you adjust a john deere 160 FC420V carburetor. It just backfires out of the carburetor and don't start

Hmmmm. Backfiring is usually a function of bad timing. Or check to make sure that the float is working and that the engine is not being flooded with gas.

Sep 09, 2017 | John Deere Garden

1 Answer

John Deere LT 133, will not start. And is backfiring. Cleaned carburetor, all fuel lines, checked fuel pump, drained old gas,replaced spark plugs

could be a major problem. take the flywheel off and check if the flywheel key is sheared. causing timing to be off. if that is ok it has dropped a valve. i just finished one yesterday with a bent push rod. it will backfire like you are saying. take the valve cover off and look to see if the valves are set correctly. ill bet you see a bent push rod in there. replace the rod, set valves and should be good to go. you can not straighten them. they are only $5.00 to $10.00

Nov 03, 2016 | John Deere Garden

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.

Aug 06, 2016 | John Deere Garden

1 Answer

Why does my 318 lawn mower back fires

Charlene: According to " What causes a small engine backfire & how do I fix it? Backfire typically occurs when the engine is decelerated rapidly.

Common Causes of Backfire:

  • Lowering engine speed too fast
  • Gasoline, which contains higher blends of alcohol
  • Carburetor adjustment set too lean
  • Muffler construction can induce backfire
  • Higher than normal engine temperatures
  • Some carburetors can induce backfire due to the sensitivity of internal transitional passages
    (This condition cannot be corrected).

Possible Fixes for Backfiring:

  • Lower engine speed slowly
  • Follow small engine fuel recommendations and/or switch to brands with low or no alcohol
  • Adjust carburetor for optimum performance
  • Inquire with equipment manufacturer about increasing air volume to decrease engine temperature"
Charlene: I hope that helps! :)

May 28, 2015 | John Deere Garden

1 Answer

My john deere 2010 backfired twice now wont do anything when I turn the key I hear tumbleweeds

So it won't activate the starter motor either?
If so then sounds like a safety switch issue.

If starter goes and it just won't start, then sounds like your fuel got cut off - check the fuel cutout solenoid that some ride-ons have on the carb - follow its wire back to the ignition switch and look for shorts / breaks etc.

Jan 24, 2015 | John Deere 2010 Tractor Basic Carburetor...

1 Answer

I cleaned my carb on onan 318 john deere , now the needle and seat is not shutting off the gas . what is the proper float level adjustment

On most float-type carburetors, the float is usually perpendicular to the edge of the carburetor body when the needle is seated.Turn the carb upside down and adjust the float if necessary, to where the float is parallel to the carburetor bowl mounting surface. There are tangs at the front of the float where it hangs on the pin that can be bent up or down to accomplish this.

Jun 18, 2011 | John Deere Garden

2 Answers

John deere 425 lawn tractor. it wont start but it has spark and fuel the starter engages and the fly wheel turns

If your tractor has an anti back fire solenoid in the front of the carburetor then it should start if you remove it and cap it off with a pipe plug.It should run if the solenoid is the problem,if so you really should replace it but if it is'nt prone to backfiring with it remove you don't have to.You may also have a bad seat switch,confirm this by jumping the plug with a piece of wire to temporarily test it.

Jan 14, 2010 | John Deere 420,1020,2010,2020,2510,2520...

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