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Just Purchased Mtd 990


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#16 tinner OFFLINE  

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Posted June 28, 2012 - 10:53 PM

That's a nice looking 990, you got your money's worth alright. It should give you years of service. Congrats and :welcome:

#17 HALFSCALE ONLINE  

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Posted June 29, 2012 - 02:26 AM

I think you'll find it is 1979, November 27th 1st shift, Which probably makes it late enough to be called a 1980 tractor.
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#18 Texas Deere and Horse OFFLINE  

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Posted June 29, 2012 - 09:41 AM

I think you'll find it is 1979, November 27th 1st shift, Which probably makes it late enough to be called a 1980 tractor.


You are right, I read the chart right, but typed in June, instead of November for some reason. :wallbanging:

Thanks for correcting me, and I agree with you thinking it is a 1980 model. :thumbs:

#19 Kentrails OFFLINE  

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Posted June 29, 2012 - 02:55 PM

It may be new enough, to have magnatron ignition .

It appears that it has one installed, I was told?

#20 Texas Deere and Horse OFFLINE  

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Posted June 29, 2012 - 02:57 PM

If it has a Magnatron, it won't have points. Can you take a photo of the ignition system?

#21 olcowhand ONLINE  

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Posted June 29, 2012 - 07:36 PM

These engines in the older models require a different flywheel for magnetron ignition, so not cheap to do. If it has magnetron, you're way better off. Some older briggs only require bolting on a magnetron coil with the old flywheels, but not the older of this model engine.

#22 Kentrails OFFLINE  

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Posted July 05, 2012 - 12:45 PM

I noticed that it has points ( the points are bypassed ) and mag, but how do I know if the flywheel was re-polorized? It ran very rough before it quit (Lost spark,) how do I check the Mag? Should I convert back to points? I read somewhere that pnts have a better spark?

Here are some photos. The two wires attatched to the small nut and screw in 2nd photo from left are grounded from he mag, the long way . I also was curious about torque values, is there a stickie?

Thanks again. I am having shoulder surgery the 12th and I want to get it on the job before then.

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#23 middleageddeere OFFLINE  

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Posted July 05, 2012 - 12:48 PM

I think you did good for $550. These ignition systems are my personal downfall so, I won't answer but my guess is someone will be able to help you very soon...

#24 Texas Deere and Horse OFFLINE  

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Posted July 05, 2012 - 02:08 PM

It is hard to tell from the picture, but with the points bypassed, I'd say someone added the Magnatron module to the coil. Make sure the 2 wires they bolted together are not grounded to the engine some where. I would clean up the flywheel and reset the coil to the flywheel. If I remember right, they should be set at .013-.016". I use a thick business card, it will be close and is non-magnetic.

#25 Kentrails OFFLINE  

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Posted July 05, 2012 - 07:40 PM

I cleaned and re-gapped Magnitron...two wires from the mag, one wire is grounded, one goes to the start switch. Is that right? Still I have no spark, should I just replace the mag?

Edited by Kentrails, July 05, 2012 - 11:36 PM.


#26 Texas Deere and Horse OFFLINE  

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Posted July 05, 2012 - 09:12 PM

Here is a link to B&S own site to help you with the Magnatron.

http://eu-en.myfaqce...oting - Repairs
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#27 Kentrails OFFLINE  

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Posted July 06, 2012 - 04:18 PM

An update...I followed all the wires, saw this circut breaker, and remembered when my motorcycle would not start, it was the breaker... and also in this case
BREAKER.jpg <<<>>>I omitted the breaker and attatched the wires directly and it started right up... :bounce:
The culprit>>> circut braker.JPG .

Are these a standard issue breaker, Autozone, Napa?

Now I am inspired to wire the lights...
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#28 Texas Deere and Horse OFFLINE  

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Posted July 06, 2012 - 05:40 PM

Glad to see you have worked through your issues. I can't wait to see some video of you running your 990 thru it's paces.

#29 MH81 ONLINE  

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Posted July 06, 2012 - 06:45 PM

Good news you found the issue, it's always nice when you find the plaguing problem.

#30 KennyP ONLINE  

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Posted July 06, 2012 - 07:07 PM

Glad it's working again! I have no idea on a replacement for that circuit breaker. Has it got any #'s on it?




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