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16hp Onan running on once cylinder untill it gets warm then both help please?


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#1 outdoorsmanjw OFFLINE  

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Posted June 10, 2015 - 12:42 PM

So my Massey 1655 I picked up has a Onan 16hp engine that will run on one cylinder untill it gets warm/hot and then it starts to run on both and runs perfectly smooth and runs great.  What could be the cause of this?


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#2 LilysDad OFFLINE  

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Posted June 10, 2015 - 02:50 PM

Maybe, valve adjustment issue? There are probably more ideas coming.


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#3 olcowhand OFFLINE  

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Posted June 10, 2015 - 05:46 PM

Usually when an ignition coil starts going bad, it is the opposite....quits on one or both sides as coil warms.  But I have heard of instances just the opposite.  Check spark when cold.  If the one side has no spark, then likely a bad coil. If it were the points or condenser, then it would affect both sides.


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#4 KennyP ONLINE  

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Posted June 10, 2015 - 06:19 PM

I have also had one with the rings stuck in one cylinder. After it warmed some, it would hit good. Used plenty of MMO in the gas & oil and solved that issue.


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#5 outdoorsmanjw OFFLINE  

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Posted June 10, 2015 - 08:35 PM

Just checked for spark and have it on both sides.

#6 ol' stonebreaker OFFLINE  

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Posted June 11, 2015 - 09:48 AM

  maybe try a comp check cold on both cyls and then another after it starts firing  on both. When I first started the p218 on my welder it was only running on one and I finally figured out the float needle and seat had a small piece of  crud in it giving an over rich mixture.

                                                Mike


Edited by ol' stonebreaker, June 11, 2015 - 09:51 AM.

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#7 outdoorsmanjw OFFLINE  

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Posted June 11, 2015 - 07:05 PM

I checked both when cold and both are right at 118-120 in each one.  I havn't checked it when its hot. 



#8 ol' stonebreaker OFFLINE  

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Posted June 11, 2015 - 09:53 PM

Sounds good for compression. Maybe yours is like mine was, in the carb. Start it cold and squeeze the fuel line closed or turn off the fuel valve if it has one and see what happens.
Mike

#9 MH81 OFFLINE  

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Posted July 07, 2015 - 06:22 AM

Have you changed the spark plugs?
If that's the issue, I'd bet the mfg starts with a C.




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