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blackduck
MMT Pro Member
Joined: Mon Nov 14, 2011 4:07 pm
Posts: 145
Location: Nevada
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 Engine trouble too lean & too rich help So my improvements are on a 212cc predator engine. 3 stage exhaust, air filter + billet adapter, breather filter, gov removed. It is back firing when throttling down, looked at spark plug and was instantly black and wet #92 jet + emulsion tube. So I started reducing down on the jet. It started back firing again but no black on spark plug. Is this a timing issue?
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| Fri May 30, 2014 6:40 pm |
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blackduck
MMT Pro Member
Joined: Mon Nov 14, 2011 4:07 pm
Posts: 145
Location: Nevada
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Re: Engine trouble too lean & too rich help Bump anyone
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| Fri May 30, 2014 9:11 pm |
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Will
MMT Elite Member
Joined: Fri Jul 08, 2011 1:54 pm
Posts: 8133
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Re: Engine trouble too lean & too rich help Is the exhaust leaking at the flange on the header?
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| Sat May 31, 2014 4:45 am |
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Wilson
MMT F.E.
Joined: Thu Jan 15, 2009 6:35 pm
Posts: 935
Location: South LA
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Re: Engine trouble too lean & too rich help Do you have any back pressure on that exhaust? I'm not sure if these motors need it, but I thought they did.
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| Sat May 31, 2014 1:17 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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Re: Engine trouble too lean & too rich help It doesnt look like the drive is hooked up in those pictures, have you run it? You will never be able to tune it properly without a load.
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| Sat May 31, 2014 1:21 pm |
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bayouboy
MMT Elite Member
Joined: Tue Jan 13, 2009 6:08 pm
Posts: 5376
Location: Venice, La
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Re: Engine trouble too lean & too rich help Could be a number of things, Timing like you mentioned, improper AF ratio, bad plug/ignition.
Also rich conditions usually back fire through the exhaust, lean conditions are normally through the carb.
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| Sat May 31, 2014 1:27 pm |
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blackduck
MMT Pro Member
Joined: Mon Nov 14, 2011 4:07 pm
Posts: 145
Location: Nevada
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Re: Engine trouble too lean & too rich help Ya no load
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| Tue Jun 10, 2014 6:15 pm |
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blackduck
MMT Pro Member
Joined: Mon Nov 14, 2011 4:07 pm
Posts: 145
Location: Nevada
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Re: Engine trouble too lean & too rich help I have to take the shaft to a machine shop to cut the key way
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| Tue Jun 10, 2014 6:16 pm |
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blackduck
MMT Pro Member
Joined: Mon Nov 14, 2011 4:07 pm
Posts: 145
Location: Nevada
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Re: Engine trouble too lean & too rich help No leak on exhaust flange
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| Tue Jun 10, 2014 6:17 pm |
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blackduck
MMT Pro Member
Joined: Mon Nov 14, 2011 4:07 pm
Posts: 145
Location: Nevada
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Re: Engine trouble too lean & too rich help Sounds like a damn Harley
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| Tue Jun 10, 2014 6:18 pm |
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