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 100$ Dation 16HP MTD 990

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Crazy_Carl
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PostSubject: Re: 100$ Dation 16HP MTD 990   Tue May 01, 2018 8:59 pm

Is it possible to put that coil on backwards?  The timing is way too advanced.  75 PSI seems kinda low to me for compression, but something is going on if it tripled.
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PostSubject: Re: 100$ Dation 16HP MTD 990   Wed May 02, 2018 5:00 am

when the thing ran good it had only 25psi. and i did put the could on backwards, it did not spark the correct way. something i did not mention here or in the video is last time it ran when had weak spark at one point it made a harsh bang, then it kept making these harsh rattly bangs till it stalled out, and it never started again. i hoped it was ignition knock since i had weak spark.
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PostSubject: Re: 100$ Dation 16HP MTD 990   Mon May 14, 2018 3:23 pm

well, still have not got the drive shaft off, snapped my last dremmel bit seeing if i could get it in there to make a slit for a flat head.
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sat Aug 11, 2018 11:23 am

still minimal luck.

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PostSubject: Re: 100$ Dation 16HP MTD 990   Sat Aug 11, 2018 1:50 pm

Now that I've watched a couple of these videos I'd say there's an ignition problem here causing it to fire backwards, 75 PSI of compression is nowhere near high enough to casue those kind of issues. Also it happened as soon as you put that new coil on, which seems like a pretty good indication to me that the issue is spark timing related.

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RichieRichOverdrive
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sat Aug 11, 2018 3:48 pm

Have you checked out the flywheel key? Really sounds like it sheared. Is it hydrolocked? I doubt the compression release failed.

You have allen wrenches don't you?
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 12:33 pm

@RichieRichOverdrive wrote:
Have you checked out the flywheel key? Really sounds like it sheared. Is it hydrolocked? I doubt the compression release failed.

You have allen wrenches don't you?
how do you explain the trippling of compression?

and yes i do, i snapped one off in the other side of that pully, i hammerd it in and used a breaker bar in it, actualy it might have been a start bit.
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 12:37 pm

I really think its the flywheel key causing most of this.

Are you sure it's not hydrolocked?
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 12:45 pm

The compression increase could have been caused by the rings seating a bit better due to running a few different times, or something like that.

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RockeyDA
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 12:51 pm

i can tell you this thing firing the wrong way happend before i changed the magnete, i was hoping the magneto was the problem is the spark was really weak from it the new one proved much much better spark. also what keystock are you talking about?



i dont see any evidence they fly whel has moved from its position with the shaft.
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RockeyDA
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 12:52 pm

@RichieRichOverdrive wrote:
I really think its the flywheel key causing most of this.

Are you sure it's not hydrolocked?

its an updraft carb, im not flooding the motor with liquid gas.
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 2:30 pm

Looks like that shaft is the flywheel nut? That small plate helps lock it in place via the hex head on the shaft nut.  To check the key being sheered, you would have to remove the little plate and that shaft. (should unscrew with a deep well and impact).  Then see if the keyway lines up.

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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 4:31 pm

@MightyRaze wrote:
Looks like that shaft is the flywheel nut? That small plate helps lock it in place via the hex head on the shaft nut.  To check the key being sheered, you would have to remove the little plate and that shaft. (should unscrew with a deep well and impact).  Then see if the keyway lines up.
deep well impact? so i can just use an adjustable wrench right? becase i dont got any sockets that wold fit that for an impact drill.
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CraftsmanQuad19
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 5:10 pm

An impact would break it loose easier. You’ll have to find some way to jam the engine to use a wrench?
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PostSubject: Re: 100$ Dation 16HP MTD 990   Sun Aug 12, 2018 6:13 pm

Yikes, adjustable wrench sounds like strip the head city?  Also if you do have a big wrench, you may be able to put rope down the spark plug to keep it from turning all the way over.  wedging something in the flywheel fans could break them off.

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PostSubject: Re: 100$ Dation 16HP MTD 990   Thu Aug 30, 2018 7:05 pm

well, i could not get the fly wheel off, i also took the carb off and held my hand over the intake and check for sucsion, i got a little then alot of blow, way more blow than suck. im back on thinking my timing is off without a doubt.
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Crazy_Carl
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PostSubject: Re: 100$ Dation 16HP MTD 990   Thu Aug 30, 2018 10:38 pm

blowing out the intake!  Sounds like the cam/crank timing is way off.
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