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Irish Yobbo
 Post subject: Replacing SU Jets
PostPosted: Sun Apr 20, 2014 8:39 pm 
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Posts: 1233
Location: Sandy Bay, Tasmania
Hi All,

When I got my mini several years ago, the previous owner had tuned the carby without the mixture screw. Instead, he had simply put the choke on until the mixture was about right. Since then the choke has a habit of sticking where it was previously held by the choke.

I'm looking at replacing the jet to prevent this - is there anything else that needs to be done? Does the jet seating wear at all? I have had some fuel leaking from the carby jet somewhere, but it's hard to tell exactly where. I was planning on getting a rebuild kit with new gaskets, jet and needle and seat - is there anything else I should be looking for?
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drmini in aust
 Post subject: Re: Replacing SU Jets
PostPosted: Sun Apr 20, 2014 10:13 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39757
Location: near Baulkham Hills, NSW
Buy the jet etc from a Mini shop or SU Midel.
Do not buy Fuel Miser jets, the hose on them does not like unleaded or ethanol fuels. I had one swell closed up.....

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Mick
 Post subject: Re: Replacing SU Jets
PostPosted: Tue Apr 22, 2014 3:48 pm 
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Joined: Fri Apr 29, 2005 9:46 am
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Location: Under the bonnet son!
You can buy the rebuild as a kit. That way you've got the lot, like the single use linkage retainers and gaskets.

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All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.
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Diesel27
 Post subject: Re: Replacing SU Jets
PostPosted: Tue Apr 22, 2014 7:35 pm 
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Location: Melbourne West
Of course make sure you retrieve all of the seal at the bowl end of the jet supply hose.

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Mick
 Post subject: Re: Replacing SU Jets
PostPosted: Tue Apr 22, 2014 8:01 pm 
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Location: Under the bonnet son!
Diesel27 wrote:
Of course make sure you retrieve all of the seal at the bowl end of the jet supply hose.


I overtightened the jet hose once, blocked the flow completely :shock:

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.
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surtees
 Post subject: Re: Replacing SU Jets
PostPosted: Tue Apr 22, 2014 8:09 pm 
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Joined: Fri Mar 16, 2012 10:59 am
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Location: Geelong, Vic
Is it worth buying the jet tool or can you do it with a long tube socket?

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Mick
 Post subject: Re: Replacing SU Jets
PostPosted: Tue Apr 22, 2014 8:16 pm 
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Location: Under the bonnet son!
There's a tool?

I never needed one. Just use a spanner to undo the jet's retaining nut.

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All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.
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surtees
 Post subject: Re: Replacing SU Jets
PostPosted: Tue Apr 22, 2014 8:22 pm 
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Location: Geelong, Vic
Yep there is a tool and my question is answered,

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I have an Addiction just not the time.......
1966 Morris Mini Deluxe http://www.ausmini.com/forums/viewtopic.php?t=80459
1968 Morris 1100 viewtopic.php?f=3&t=101555
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