Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Jan 2016
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L - Learner Plates On
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OP
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Hi I have a 1965 morgan plus 4 all of a sudden the choke needs to held to stay out, if you let it go it closes any help would be appreciated
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Joined: Aug 2010
Posts: 5,466 Likes: 171
Charter Member
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Joined: Aug 2010
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Sounds like you have lost the clothes peg.
Paul
Costock, UK
Plus Four 75th - Furka Rouge - Pip
Disco 5
Teddy - 17h1 Irish Draught cross
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Joined: Dec 2011
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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Hi I have a 1965 morgan plus 4 all of a sudden the choke needs to held to stay out, if you let it go it closes any help would be appreciated My '63 +4 does not stay out either. I think it is designed that way. Another words pull choke (fuel enrichment)to start and release choke knob to run. If the choke (fuel enrichment jet) sticks open, put some petroleum jelly on the jet so it does not. There is a "Jet locking nut" that pushes against a cork washer. If the "Jet Locking Nut" is too tight the jet will stick. If it is too loose it will leak. Make sure after +4 is started that this jet returns to its normal position. It often sticks and the +4 runs too rich. Read Your manual on SU Carbs. There are a lot of little details that must be attended to properly for it to operate properly.
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Member of the Inner Circle
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Hi I have a 1965 morgan plus 4 all of a sudden the choke needs to held to stay out, if you let it go it closes any help would be appreciated Hang your man bag on it. 
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Joined: Sep 2015
Posts: 145
L - Learner Plates On
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The jet locking nut is used to centralize the jet on the needle. I have found that when the choke was too hard to pull the jets needed to be re-centered, but I've never had it work the other way.
'61 +4 DHC
'70 4/4
'80 4/4 4seater
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Joined: Apr 2014
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Charter Member
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I have similar on the +8, should be pull and turn to stay on, but it only works on certain days of the week...strange.
.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
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The jet locking nut is used to centralize the jet on the needle. I have found that when the choke was too hard to pull the jets needed to be re-centered, but I've never had it work the other way. Yes: That is true. The locking nut and cork washer assy. also seal the jet from leaking fuel. The trick is to center the jet and tighten the jet locking nut just enough to prevent fuel from leaking out but not so tight that the jet does not freely move up and down while choking. Not always easy to do. In the case of H-6 SU's the word is not "Choking" but "Fuel enrichment". Picky, Picky!
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I think I solved it the twist to the right was the way to go thanks for all the input
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Joined: Dec 2011
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Talk Morgan Enthusiast
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I think I solved it the twist to the right was the way to go thanks for all the input Ha! Ha!
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I recall some chokes were "twist" to stay out after pulling. Quarter turn or so.
Richard
1976 4/4 4 Seater
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