No Ignition Spark

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  #1  
Old 03-27-02, 02:44 PM
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no spark on lawn mower

I have an MTD mower with a 4hp Tech. which is 3 years old and doesnt think Spring is here yet.
There is no spark at cable end.
Is this just a bad pick up module-not sure what its called?
also if so , do's the magnet need replaced also?
Thanks to anyone .
 
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  #2  
Old 03-27-02, 07:36 PM
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Did it run last time you used it? Could you have run over anything with it?
 
  #3  
Old 03-27-02, 08:18 PM
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Hello and Welcome rajung to our Small Engine forum.


First thing to do is replace the spark plug with a new one. Then attempt to start the engine. if it still fails to start, test for spark with the new plug. Be sure the plug is correctly grounded to the engine when it is lying across the engine.

If there is still no spark, check the engine grounding clip and the wire at both ends. The throttle cable may have a grounding clip to kill the engine.

The safety blade stop cable end operates a blade brake band and an engine kill switch, which has a grounding clip. Either of which may be grounding out.

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  #4  
Old 03-27-02, 09:45 PM
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I agree w/|Tom...replace spark plug, and if you still don't have spark, check the engine brake/shutoff. The cable might be stretched, or not releasing the shutoff far enough.
 
  #5  
Old 03-29-02, 07:48 AM
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Thanks for all the info.
I did replace the plug first awhile ago,also no spark right at cable end, before spark plug.
I suppose the best way to check all the wires over well is to pull upper rotor off?
Is a 3 prong jaw puller the best?
Thanks
 
  #6  
Old 03-29-02, 12:10 PM
Fisher
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Leave the flywheel alone, there is nothing under
it. Unplug the wire going to the bottom of the
coil and check for spark again, if you have no
spark then, the coil is bad.
Fish
 
  #7  
Old 03-30-02, 05:43 AM
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is it possible the flywheel has coat of rust on it and needs a little sanding/cleaning?
 
  #8  
Old 03-30-02, 05:48 AM
Fisher
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I have not ever encountered rusty magnets as causing a problem,
I sure others will disagree as it seems to be a popular suggestion.
I cannot imagine a small layer of rust affecting the magnetic
field.
Fish
 
  #9  
Old 03-31-02, 08:18 AM
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I removed the 2 bolts that hold the brake assy and ground wire off the engine block, then removed the spring for the return and removed the assy. from under the flywheel and checked for groun/no ground with an ohm meter and the small switch works fine.
I then reassembled and forced and held the lever forward that connects to the shut down cable and it started.
For some reason the handle is not pulling like it should causing the ground wire to make contact in the switch.
I doesnt seem the be as resistful anymore though I do not see any place for adjustment.
Do these cables stretch after a little time?
Nothing looks bent and the pull back arm seems to have slack-about half way.
Thanks again.
 
  #10  
Old 03-31-02, 08:45 AM
Fisher
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Does the handle/lever have any other holes it can
rest in? Or are their other holes on the handle.
Is their any bent metal where the cable attaches at the
engine? Have you switched parts?
Fish
 
  #11  
Old 03-31-02, 01:07 PM
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There are other holes in the main handle but they make it way too tight.
No bent metal that I can see, and I havent switched any parts.
Starting to sound too me -you get what you pay for.
Only 169.00
Maybe I should support my community and have bought a local built(?) J.D$$
 
  #12  
Old 03-31-02, 02:52 PM
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As mentioned earlier, your cable is likely the problem. The cable itself doesn't usually stretch, but the cable housing made of coiled wire will stretch and/or compress above the point where it is binding. Take the old cable off and take it to your lawnmower parts store, and get another. You may be able to spray penetrating oil on the visible ends of the cable while working it back and forth to get it going again. Most inexpensive mowers don't have adjustments for this cable.

Happy Easter!! He arose!
 
  #13  
Old 04-01-02, 02:25 AM
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have not ever encountered rusty magnets as causing a problem

Surprising to me that I may have cleaned several for no reason. Not sure if there was no spark on these, but I figured the gap may have been changed due to the rust. At any rate I have had small engines not run after being left outside for prolong periods of time (winter) until I cleaned the flywheel and coil. Heheh, little confused now. But I am not a small engine mechanic per se.
 
  #14  
Old 04-01-02, 04:06 PM
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Smile

I'll try to lube cable, seems like a good idea since I do go under quite a few shrubs & trees.
Snow today!
Thanks again for all the info to everyone.
 
  #15  
Old 04-02-02, 05:19 PM
tirekicker
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[QUOTE]Originally posted by rajung


FORUM MODERATOR NOTE:
------------------------------
Your post has been deleted tirekicker. This is a forum for people to ask questions and learn. Remarks that insult the forum readers and posters will be removed. We will, however, welcome any good advice you have to give our readers. Thank you---Cheese
 

Last edited by cheese; 04-02-02 at 09:52 PM.
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