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I have a John Deere zero turn z425 that wont start, changed spark plugs and one spark plug has good spark the other only has a little spark.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 69 Answers

SOURCE: JOHN DEERE 318 LAWN TRACTOR WONT START

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

  • 32 Answers

SOURCE: John Deere F620 zero turn mower

you probably have the belt on wrong, check your manual to see if you have it on right.

Posted on Jun 21, 2009

  • 1 Answer

SOURCE: Why would my sst18 john deere zero turn steer in

there is a servo under the main body on the right side win sitting in seat thats broken from the_w4ezv@yahoo.com

Posted on Oct 22, 2009

rwvanlue
  • 486 Answers

SOURCE: I have a John deere 317 tractor that does not start.

We will be testing for voltage to the points, coil, engine to tractor wiring harness, ignition switch

Tools needed:
volt meter to read 12 volts, or test light

1) with the points open: is there voltage at the connection wire at the points
If yes; adjust points to .020" and try to crank engine and check for spark
*** you may want to determine if condensor is connected to this wire also
if no
2) check point side (neg or - ) of coil for voltage
if yes, engine should start
if no
3) check for voltage at the + side of coil
If yes, coil is bad
if no
4) check wire connector from engine to frame wiring harness
if yes; engine should start

if no
5) check wiring on the back of ignition switch
if yes; engine should start

if no
6) check that ignition switch RED or BATTERY supply wire has voltage
if yes; switch is bad

if no
7) check supply wire and circuit breaker connected to the battery side of the solenoid
if yes; engine should start

if no; circuit breaker could be at fault or wire connector at battery supply

Posted on Nov 08, 2009

  • 2 Answers

SOURCE: John Deere 115 lawn tractor - won't start.

I have a 115 john deere tractor that runs but the engine will not run smooth I've put a new fuel cap on it a new pump and clean out the carb.

Posted on Aug 18, 2010

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