Dixie Chopper LT2700 started blowing white smoke suddenly

bijiminy said:
This is a follow up to my post. I was unable to get the carburetor replacement for the Nikki OE4215. The vendor sent me the wrong carburetor, so I decided to replace my dropped out jets, using new o rings. As it turns out, the starter was also weak, so I replaced the starter. The engine fired right up with the new starter and o rings. No smoke. My question now is: which engine manufacturers use these same type of jets, in guess all in Nikki carburetors, held in by rubber o rings? It seems a set up for failure.
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It is just a production variation thing
No 2 parts are ever identical so on some the holes for the jets will be a tiny fraction bigger , and we are talking microns here not thou
Put them together with a O ring that is a couple of micron smaller and you have falling jets .
Some can get pushed back with a slight smeer of rubber grease and light finger pressure
Others need silicon spray and a tap with a punch .

Not all that long ago parts would be matched up according to how far away from the perfect dimension they were but production control has got to the point that 99.99% will interchange just fine .
Back in the old days finding parts that fit perfectly together was a common occurance and was called blueprinting .
Now days it is only done on race engines & aircraft and possibily some military equipment where a cheap selling price is not the driving criteria .

In sound engineering practice every O ring that is removed gets replaced ever time it comes out .
Just like Hammer I buy rings in packets of 200 , usually in a higher grade rubber than the original and replace them as a matter of course
It take about 5 seconds to swap an O ring and cost less than 10¢ it take 30 minutes to remove strip & replace the carb so it is a no brainer
 
bertsmobile1 said:
It is just a production variation thing
No 2 parts are ever identical so on some the holes for the jets will be a tiny fraction bigger , and we are talking microns here not thou
Put them together with a O ring that is a couple of micron smaller and you have falling jets .
Some can get pushed back with a slight smeer of rubber grease and light finger pressure
Others need silicon spray and a tap with a punch .

Not all that long ago parts would be matched up according to how far away from the perfect dimension they were but production control has got to the point that 99.99% will interchange just fine .
Back in the old days finding parts that fit perfectly together was a common occurance and was called blueprinting .
Now days it is only done on race engines & aircraft and possibily some military equipment where a cheap selling price is not the driving criteria .

In sound engineering practice every O ring that is removed gets replaced ever time it comes out .
Just like Hammer I buy rings in packets of 200 , usually in a higher grade rubber than the original and replace them as a matter of course
It take about 5 seconds to swap an O ring and cost less than 10¢ it take 30 minutes to remove strip & replace the carb so it is a no brainer
Click to expand...
Thanks Bert. I hope these O Rings last awhile. I didn't take off my carb from the engine to replace the O rings as I had no replacement gaskets. It wasn't easy. It seems like the pressure from fuel delivery to the jets would be enough to blow them out.
 
Personally I think it is normal intake vacuum pulling fuel through the jets that does it. At the small volume I change these I just use the o-rings from Kawasaki myself. Now I do change them on every carburetor rebuild since I have found them as Briggs only wants to sell the jets and o-rings as a set.
 
StarTech said:
Personally I think it is normal intake vacuum pulling fuel through the jets that does it. At the small volume I change these I just use the o-rings from Kawasaki myself. Now I do change them on every carburetor rebuild since I have found them as Briggs only wants to sell the jets and o-rings as a set.
Click to expand...
Do all engine manufacturers I.E. Briggs, Kawasaki, Koehler, Generac use Nikki carburetors and hence jets and O rings?
 
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