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Re: Smoking Naa with Very Good Compression

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George Marsh

10-15-2012 19:01:03

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When you choke any engine it will burn oil because the rich mix washes oil off cylinder walls. Is it possible your carb is too rich? Take a look at your plugs. If you are burning oil, there should be deposits on plugs instead of a clean gray look.

Had a 70 dodge spirit with bad exhaust valve guides. It was a problem with the 3.0L engine design. It would produce a smoke screen. So as mentioned, it could be a valve guide problem. If it's exhaust guide, the plugs will not show it's burning oil, because the oil only gets into the hot exhaust gasses.

I have a 20 hp kohler engine. Had to go with the next hotter plug to keep carbon off plug. Engine doesn't use a drop of oil in 75 hours. After that it starts using oil. Time to change oil. It too will give off a puff of smoke when I choke it.

Keep looking, you will find the problem.


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10-15-2012 19:40:43

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 Re: Smoking Naa with Very Good Compression in reply to George Marsh, 10-15-2012 19:01:03  
George, you might have hit the nail on the head , it does need some carb work. Thanks

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George Marsh

10-17-2012 18:45:43

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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 19:40:43  
If I recall your carb has two adjustments. One of the adjustments is backwards, meaning the more you screw it outwards, the leaner it gets. Again, I can't remember. Look at your manual. There are many here who don't suffer from CRS like me. They can give you better info about carb adjust on the Naa.

I know for a fact, my IH C has only one adjustment, someone screwed it all the way in and the fuel mix was way too rich.


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