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| Engine trouble too lean & too rich help http://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=53622 |
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| Author: | blackduck [ Fri May 30, 2014 6:40 pm ] |
| Post subject: | 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? Sent from my iPhone using Tapatalk |
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| Author: | blackduck [ Fri May 30, 2014 9:11 pm ] |
| Post subject: | Re: Engine trouble too lean & too rich help |
Bump anyone Sent from my iPhone using Tapatalk |
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| Author: | Will [ Sat May 31, 2014 4:45 am ] |
| Post subject: | Re: Engine trouble too lean & too rich help |
Is the exhaust leaking at the flange on the header? |
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| Author: | Wilson [ Sat May 31, 2014 1:17 pm ] |
| Post subject: | 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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| Author: | cb5331 [ Sat May 31, 2014 1:21 pm ] |
| Post subject: | 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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| Author: | bayouboy [ Sat May 31, 2014 1:27 pm ] |
| Post subject: | 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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| Author: | blackduck [ Tue Jun 10, 2014 6:15 pm ] |
| Post subject: | Re: Engine trouble too lean & too rich help |
Ya no load Sent from my iPhone using Tapatalk |
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| Author: | blackduck [ Tue Jun 10, 2014 6:16 pm ] |
| Post subject: | Re: Engine trouble too lean & too rich help |
I have to take the shaft to a machine shop to cut the key way Sent from my iPhone using Tapatalk |
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| Author: | blackduck [ Tue Jun 10, 2014 6:17 pm ] |
| Post subject: | Re: Engine trouble too lean & too rich help |
No leak on exhaust flange Sent from my iPhone using Tapatalk |
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| Author: | blackduck [ Tue Jun 10, 2014 6:18 pm ] |
| Post subject: | Re: Engine trouble too lean & too rich help |
Sounds like a damn Harley Sent from my iPhone using Tapatalk |
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