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Hot!Found main jet loose in Nikki carburator

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Dutch Rob
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2016/10/13 11:54:04 (permalink)
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Found main jet loose in Nikki carburator

LS,
 
After having problems for a while with a John Deere X155R with B&S 405577, I found the main jet loose in the carburator.
This declares at least the massive fuel consumption of > 5l/hr, and running very bad.
Carburator is a Nikki 697722 / G02401 / 7809 type.
I have no idea where the jet is supposed to be.
It has a small o-ring, probably to keep it in place, it has no thread.
In the B&S Illustrated Part List (405500) it is part number 117 / 791406.
Help to locate the position is much appreciated, looking forward to response!
 
Rob, the Netherlands

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    Mikel1
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    Re: Found main jet loose in Nikki carburator 2016/10/14 09:38:50 (permalink)
    Dutch Rob
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    Re: Found main jet loose in Nikki carburator 2016/10/15 16:34:46 (permalink)
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    Thx Mikel for your response, this is very useful.
    I will study it this week, next Saturday is first opportunity to work on the carburator again.
    I'll keep you informed wrt the outcome!
    Dutch Rob
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    Re: Found main jet loose in Nikki carburator 2016/11/07 12:04:01 (permalink)
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    I used the Nikki info from Mikel1, and found several things out.
     
    Main jet loose?
    No --> the main jet just fell out during dismounting the carburator I think, the new one with a fresh o-ring found it's place and suited well. The main jet is 'closed by shape', there is no way it can fall out after having mounted the parts.
    So, main jet excluded.
     
    Coming to the real issue:
    The issue as described on top was caused by a missing idle jet. According the pictures in the document of the link, it should be in one of the holes in the carburator body. But is was not there.
    I - unfortunately - had to order a new carburator and the issue was solved.
     
    Though the B&S is running like new, my John Deere only has 130 hrs on the clock.
    From quality perspective it is hard to accept this issue.
     
     
     
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