| | 12.5 IC Flathead blowing air out through intake | |
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Doug Site Owner
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Age : 29 Join date : 2012-12-24 Points : 7735 Posts : 3044 Location : Lebanon County, PA
| Subject: 12.5 IC Flathead blowing air out through intake April 8th 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. Head Forum Administrator ** Chat Moderator ** Facebook Page AdminATLTF Facebook Page ** Chatbox ** How To Upload Pictures
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| | | crafsmankiller Member
Age : 27 Join date : 2012-10-18 Points : 4849 Posts : 412 Location : livingston texas
| | | | Doug Site Owner
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Age : 29 Join date : 2012-12-24 Points : 7735 Posts : 3044 Location : Lebanon County, PA
| Subject: Re: 12.5 IC Flathead blowing air out through intake April 9th 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. Head Forum Administrator ** Chat Moderator ** Facebook Page AdminATLTF Facebook Page ** Chatbox ** How To Upload Pictures
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| | | crafsmankiller Member
Age : 27 Join date : 2012-10-18 Points : 4849 Posts : 412 Location : livingston texas
| Subject: Re: 12.5 IC Flathead blowing air out through intake April 10th 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. | |
| | | Stretch44875 Administrator
Age : 49 Join date : 2012-04-05 Points : 5657 Posts : 959 Location : Mansfield, Ohio
| Subject: Re: 12.5 IC Flathead blowing air out through intake April 10th 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. | |
| | | Doug Site Owner
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Age : 29 Join date : 2012-12-24 Points : 7735 Posts : 3044 Location : Lebanon County, PA
| | | | Stretch44875 Administrator
Age : 49 Join date : 2012-04-05 Points : 5657 Posts : 959 Location : Mansfield, Ohio
| | | | BlackMountian88 Member
Age : 25 Join date : 2012-09-08 Points : 4849 Posts : 399 Location : NH
| | | | Doug Site Owner
2014 Build-Off Entrant
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Age : 29 Join date : 2012-12-24 Points : 7735 Posts : 3044 Location : Lebanon County, PA
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