Trouble Idling

Focker · Sep 24, 2018

OzFin said: ↑

Not likely. Once the engine is warmed up a functioning exhaust heat riser opens fully and is essentially removed from the system.
I do not run a heat riser on either one of my 225's... one had headers and the other has cast iron manifolds and the heat riser was removed years ago.
As mentioned by others there are tiny passages in the carburetor for the idle circuit, an ultra sonic cleaner, guitar strings, solvent works well to clean them. You had mentioned that the check ball under the accelerator pump was stuck, perhaps the carb is not as clean as it should be. The idle circuit tubes & wells along with the tiny passages all work in conduction with the proper float level, vacuum level and atmospheric vents, a little bit of obstruction can be very troublesome.
Here is a pretty good description of the carb's idle circuit http://www.carburetor-parts.com/assets/2 Jet.pdf
Also check for vacuum leaks as suggested, I watched your video and when I had a similar issue it was a vacuum leak that was the culprit.
This issue is frustrating but you have demonstrated that you have a mechanical aptitude, I believe that you can work through this problem without sending the carb out for service.
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Johns1967CJ5 · Sep 26, 2018

Picked up the carb today she looks good put it on she runs great he said he didn't find anything really wrong with it when he took it apart so he thinks it's a cleanliness thing keeping my fingers crossed

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Trouble Idling

Focker That's a terrible idea...What time? Staff Member

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Focker That's a terrible idea...What time? Staff Member

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