I fired up my '19 for the first time since last fall and though started, it ran poorly. In fact, it barely made it around the block. I had to work the choke a lot to keep it running. I decided to pull the carb (bronze L4) for a clean. I've never had it off the car or completely apart. I discovered that it is missing the flapper.
What is the purpose of this part? Typically how does the engine run without it? Where can I get a replacement? My car has always had a bit of a misfire at idle. I'm wondering if the missing flapper might be the reason.
Thanks
Kingston L4 Question
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Apis Mellifera
Topic author - Posts: 57
- Joined: Fri Apr 29, 2022 6:48 am
- First Name: Matt
- Last Name: Kemper
- * REQUIRED* Type and Year of Model Ts owned: 1914 Touring, 1919 Touring
- Location: Charleston, WV
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Corey Walker
- Posts: 637
- Joined: Sun Jan 06, 2019 11:46 am
- First Name: Corey
- Last Name: Walker
- * REQUIRED* Type and Year of Model Ts owned: 1914 runabout, 1921 homemade truck, 1921 Speedster
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Re: Kingston L4 Question
The reason you had to work the choke a lot is because of the missing flapper. That flapper is a weighted air valve. When idling the flapper is closed it allows less air to flow and more gasoline to be picked up. As the engine speed increases the airflow causes the flapper to rise up and allow more air to flow through and lean out the mixture. As you describe, without that flapper it will barely run at all because it would be starved for fuel pretty much all the time.
Corey Walker, Brownsboro, Texas
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CudaMan
- Posts: 2531
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Re: Kingston L4 Question
I have a couple of the later, tongue shaped style flapper, I'd be happy to send you one if you can use it, PM or email me via the forum with your shipping address and I'll send you one.
Based on the cross section below, it's possible that your brass L4 may use the earlier, more ball shaped flapper, in which case one of mine won't fit.
Based on the cross section below, it's possible that your brass L4 may use the earlier, more ball shaped flapper, in which case one of mine won't fit.
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Mark Strange
Hillsboro, MO
1924 Cut-off Touring (now a pickup)
Hillsboro, MO
1924 Cut-off Touring (now a pickup)
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Mark Gregush
- Posts: 5370
- Joined: Sat Jan 05, 2019 1:57 pm
- First Name: Mark
- Last Name: Gregush
- * REQUIRED* Type and Year of Model Ts owned: 1925 cutdown PU, 1948 F2 Ford flat head 6 pickup 3 speed
- Location: Portland Or
- Board Member Since: 1999
Re: Kingston L4 Question
If you are missing the flapper chances are you are also missing the bumper that fits in the air valve cap. If so and it is the earlier carb with larger air valve cap, you can make one out of cork. Langs sells the smaller later L4 bumper.
I know the voices aren't real but damn they have some good ideas! 
1925 Cut down pickup
1948 Ford F2 pickup
1925 Cut down pickup
1948 Ford F2 pickup
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Apis Mellifera
Topic author - Posts: 57
- Joined: Fri Apr 29, 2022 6:48 am
- First Name: Matt
- Last Name: Kemper
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- Location: Charleston, WV
Re: Kingston L4 Question
It is missing the cork bumper for the valve. Thankfully the pin for the flapper is still on the screw. If anyone knows of a source for the flapper for this carb, please let me know. I'd also buy a complete carb if necessary.
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CudaMan
- Posts: 2531
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Re: Kingston L4 Question
Matt, I boxed up one of my later flappers and one of the small cork bumpers that the vendors sell for the later carbs, they should ship out tomorrow (Monday) in a single small USPS Priority mail flat rate box. Please send them back if they don't fit your carb. 
Mark Strange
Hillsboro, MO
1924 Cut-off Touring (now a pickup)
Hillsboro, MO
1924 Cut-off Touring (now a pickup)
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CudaMan
- Posts: 2531
- Joined: Fri Jan 04, 2019 4:17 pm
- First Name: Mark
- Last Name: Strange
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- Location: Hillsboro, MO
- Board Member Since: 2013
Re: Kingston L4 Question
BTW, here is a drawing of the later Kingston L4 courtesy of Martynn Vowell:
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Last edited by CudaMan on Mon Mar 18, 2024 8:37 am, edited 1 time in total.
Mark Strange
Hillsboro, MO
1924 Cut-off Touring (now a pickup)
Hillsboro, MO
1924 Cut-off Touring (now a pickup)
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Apis Mellifera
Topic author - Posts: 57
- Joined: Fri Apr 29, 2022 6:48 am
- First Name: Matt
- Last Name: Kemper
- * REQUIRED* Type and Year of Model Ts owned: 1914 Touring, 1919 Touring
- Location: Charleston, WV
Re: Kingston L4 Question
Many thanks, Mark!