185EZ
Infinity and Beyond
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Just throwing stuff out there
Have you pulled the plug on the bottom of the muffler to clean the spark arrestor?
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lakecityemt
Alaska, United States
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185 - My dad was not aware of their being a spark arrestor. In the visible portions none were found, its possible its in an area he could not see.
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185EZ
Infinity and Beyond
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Look underneath the muffler
Probably a square 1/4" pipe plug
Remove it and run the gen
Could be a lean condition if the plug porcelain was white but you just changed plugs.
The tip was black so maybe it's more ignition related, wire, coil, circuit board etc.
Check your altitude adjustment
The fact you replaced carb and pump and filters points more to ignition or lack of.
* This post was
edited 08/16/19 11:38am by 185EZ *
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Chum lee
Albuquerque, NM
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"I assume from the backfiring?"
I can't see it or hear it run online. That said:
Backfiring implies that unburned mixture IN THE INTAKE tract is being ignited and burned. (not the exhaust) Can you confirm that? Backfiring is a classic condition of a lean mixture which would point to a vacuum leak somewhere in the intake. Are all the breather hoses connected properly? Is the (new) carburetor properly seated on the manifold with all the gaskets? When hot, a lean mixture can lead to pre-ignition/detonation which may sound like a backfire.
What happens if you manually force the choke on with the engine warmed up, loaded, and backfiring? (richen the mixture) Any improvement?
Do you have a compression tester? If so, does the engine meet the compression specs?
Chum lee
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lakecityemt
Alaska, United States
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He did remove a square plug, we will try that again with the new plug
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Dutch_12078
Winters south, summers north
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lakecityemt wrote:185 - My dad was not aware of their being a spark arrestor. In the visible portions none were found, its possible its in an area he could not see.
As 185EZ said, the cleanout plug is at the bottom of the muffler. Unscrew the plug and run the generator under load for about 5 minutes.
![[image]](https://i.imgur.com/2JrClojl.jpg)
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lakecityemt
Alaska, United States
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I will try that, if it will run under a load, that is the whole problem, LOL...
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lakecityemt
Alaska, United States
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Chum lee wrote:"I assume from the backfiring?"
I can't see it or hear it run online. That said:
Backfiring implies that unburned mixture IN THE INTAKE tract is being ignited and burned. (not the exhaust) Can you confirm that? Backfiring is a classic condition of a lean mixture which would point to a vacuum leak somewhere in the intake. Are all the breather hoses connected properly? Is the (new) carburetor properly seated on the manifold with all the gaskets? When hot, a lean mixture can lead to pre-ignition/detonation which may sound like a backfire.
What happens if you manually force the choke on with the engine warmed up, loaded, and backfiring? (richen the mixture) Any improvement?
Do you have a compression tester? If so, does the engine meet the compression specs?
Chum lee
Chum you might be a bit over my head, LOL... I will ask him to try and manually adjust the choke when its backfiring. No compression tester.
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grizzzman
salt lake city, Utah
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When I had that happen to my onan,I found a broken valve spring. Worth a look. ( it had about 150 hours on it.)
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lakecityemt
Alaska, United States
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grizzzman wrote:When I had that happen to my onan,I found a broken valve spring. Worth a look. ( it had about 150 hours on it.
Thanks, sadly not something we are capable of fixing
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