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 12.5 IC Flathead blowing air out through intake

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Doug
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PostSubject: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeMon Apr 08, 2013 4:49 pm

So I was working on reviving one of my 12.5 I/Cs I had to put on an MTD mower im working on repairing to mow grass. I got it all set up, hooked fuel up to it and starter fluid and let it turn over, but I noticed it was blowing air out through both the exhaust and the intake. Is something wrong with my timing? Too much compression? I just replaced the head gasket but it was an OEM replacement.

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crafsmankiller
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeTue Apr 09, 2013 12:19 pm

if its blowing out both ends (no pun) the valves could be getting stuck, or timing could be off a little. assuming its a flat head.
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Doug
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeTue Apr 09, 2013 3:08 pm

Its a flathead.

I was Googling what was wrong and something said it could be the valves. Ill try pulling the head off and getting a wire brush in there.

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crafsmankiller
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeWed Apr 10, 2013 12:29 pm

my gokart motor does the same thing. but i think its more from over heating and lack of lube. i ran it without oil yesterday for 2 hrs. it was blowing as much out as it was in.
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Stretch44875
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeWed Apr 10, 2013 1:26 pm

Just fixed my kids 12hp with this problem, not enough valve clearance on the intake valve. took valve out and ground a little off, all is well now. Actually took a little too much off, has a slight valve tick now. But runs good.
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Doug
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeWed Apr 10, 2013 3:39 pm

So the valve needs cleaned. Can I do it without taking it apart?

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Stretch44875
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeThu Apr 11, 2013 10:10 am

If its the same as mine, no. Need to remove valve, and grind off stem end until you have .010 in clearance between valve and lifter, when piston is on top.
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BlackMountian88
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeFri Apr 12, 2013 6:17 pm

Did you take a look under the head?
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Doug
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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitimeFri Apr 12, 2013 7:58 pm

Not recently no. It snowed today and the MTD its on is outside so im not gonna touch it till it gets warmer out.

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PostSubject: Re: 12.5 IC Flathead blowing air out through intake   12.5 IC Flathead blowing air out through intake Icon_minitime

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