52 pan with linkert problems
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Stage II
Joined: Jan 2024
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From: 5290
52 pan with linkert problems
Hey everyone,
I know this sort of thing has been covered a lot but can’t find anything that’s helped me directly.
52 pan running a linkert and a morris m74 mag. I’ve owned it a few months it’s always been a little tricky to start cold but once hot one kick and warm a few kicks usually will do it. Recently it’s become very tough to start cold and hot. I checked the plugs they looked fine but I replaced them anyway and gapped at .020 I have sprayed the intake manifold when it’s running and it doesn’t appear to have any leaks. Where I am getting confused is when I pull a plug after trying to start it it doesn’t seem very wet however when I prime it with choke on It appears to be getting plenty of fuel into the carb it will spit some out as well then when I pull a plug and check it for spark which it always has and put the plug back it in it will start up. I’m scratching my head any help would be awesome.
I know this sort of thing has been covered a lot but can’t find anything that’s helped me directly.
52 pan running a linkert and a morris m74 mag. I’ve owned it a few months it’s always been a little tricky to start cold but once hot one kick and warm a few kicks usually will do it. Recently it’s become very tough to start cold and hot. I checked the plugs they looked fine but I replaced them anyway and gapped at .020 I have sprayed the intake manifold when it’s running and it doesn’t appear to have any leaks. Where I am getting confused is when I pull a plug after trying to start it it doesn’t seem very wet however when I prime it with choke on It appears to be getting plenty of fuel into the carb it will spit some out as well then when I pull a plug and check it for spark which it always has and put the plug back it in it will start up. I’m scratching my head any help would be awesome.
Seasoned HDF Member
Joined: Nov 2006
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From: la la land jerzey
2 things usually are at issue
throttle shaft is loose in the bushings - we change and fit all 3 pieces together to no movement and free to turn - its a finesse
they also have a thin. O ring for the Venturi most are loose in the bore - what happens is the air is not being metered the o ring fixes that ( starting sip )
buy 2 o rings and use very slippery to install from the back to the front making sure the o ring stayes to the back of the cut out if not pull it out and do it again sometimes the o ring. Gets damaged reason for 2 - the nozzle is also a thing to get back in just be easy with all of it using an o ring
throttle shaft is loose in the bushings - we change and fit all 3 pieces together to no movement and free to turn - its a finesse
they also have a thin. O ring for the Venturi most are loose in the bore - what happens is the air is not being metered the o ring fixes that ( starting sip )
buy 2 o rings and use very slippery to install from the back to the front making sure the o ring stayes to the back of the cut out if not pull it out and do it again sometimes the o ring. Gets damaged reason for 2 - the nozzle is also a thing to get back in just be easy with all of it using an o ring
Thread Starter
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Stage II
Joined: Jan 2024
Posts: 2
Likes: 0
From: 5290
Thanks for the response, throttle shaft and bushes makes sense and I suspect that may be the culprit. Without disassembling anything I can feel some play in it. Couple of questions, spraying it should tell me if there’s a vacuum leak there ? It’s possibly causing enough of a leak to cause hard starting and lean enough I’m seeing no fuel at the plugs when trying to start ? I’m just trying to diagnose as much as possible before I start pulling things apart. Looks pretty straight forward to replace the bushings and shaft. I’m assuming you ream the bushings once installed ?
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
We had a reamer made for the job as you need to hold center on both ends of the hole at the same time
for many years we did one at a time and reamed the new one just till the shaft fit then the other then matched the pair is easier
BUT if you dont do the o ring your there already - the over all performance is still being affected < amazing and it installs in the back - throttle blade side
we see from time to time a small o ring instead of the load top spring under the cable lever < earlier fix we would put just a small amount load on the small o ring between the shaft opening and the lever - if not the throttle bore becomes dug out by the blade rubbing on the carb body - new spring or o ring no other invent fix
for many years we did one at a time and reamed the new one just till the shaft fit then the other then matched the pair is easier
BUT if you dont do the o ring your there already - the over all performance is still being affected < amazing and it installs in the back - throttle blade side
we see from time to time a small o ring instead of the load top spring under the cable lever < earlier fix we would put just a small amount load on the small o ring between the shaft opening and the lever - if not the throttle bore becomes dug out by the blade rubbing on the carb body - new spring or o ring no other invent fix
Stellar HDF Member
Joined: Aug 2020
Posts: 3,196
Likes: 2,240
From: College Station, TX
When you get new bushings, be sure the OD of the bushing is correct. I've run across some that are too large and could damage the carb body from using too much force trying to install them. Measure the ones you remove to compare against the ones you have before trying to install them. I've seen some damaged carb bodies from not doing it correctly.
FWIW - I've had good luck with getting Linkert parts from a guy in Wyoming. Not sure of your location, but I have always received the correct parts. He has a lot of information on his web site that may be helpful.
http://www.linkertcarbs.com/
Paul
FWIW - I've had good luck with getting Linkert parts from a guy in Wyoming. Not sure of your location, but I have always received the correct parts. He has a lot of information on his web site that may be helpful.
http://www.linkertcarbs.com/
Paul
Last edited by pgreer; Jan 23, 2024 at 07:13 AM.
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