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503 troubles .....

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nazz57(at)yahoo.com
Guest

Posted: Mon Jun 14, 2021 7:27 pm Post subject: 503 troubles .....

Did the engine previously run normally with that same prop at the same pitch? And



now will not? Or is this a new engine prop combination?



--------



Richard Pike



Kolb MKIII N420P (420ldPoops)



Kingsport, TN 3TN0



same prop.. no change to pitch. ............ i'm suspecting the carbs. the engine runs smooth up to 4000 rpm, beyond  4000 it bogs down. it is rather old, i wonder if the seals in the carbs are leaking and sucking air?... i have ordered 2 seal kits for the carbs.  stay tuned!

       2 broke Tim

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stuart(at)harnerfarm.net
Guest

Posted: Tue Jun 15, 2021 3:59 am Post subject: 503 troubles .....

What happens if you apply the enricher as it starts to bog down?

 

If making the mixture more rich helps then it is running lean when bogging down and you likely have an air leak. The only two places I can think for air leak is the carb boot or the crank seals. Carb boots are notorious for this and easy to replace. I hope your crank seals are fine.

 

If making the mixture more rich contributes to the problem it is already running too rich. Are you seeing any additional smoke at 4000 RPM? If too rich, perhaps the little rubber tip on the enricher is bad and letting too much fuel in.

 

Let us know what you find.

 

From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of artdog1512

Sent: Monday, June 14, 2021 10:28 PM

To: Kolb-List Digest Server

Subject: 503 troubles .....

 

Did the engine previously run normally with that same prop at the same pitch? And



now will not? Or is this a new engine prop combination?



 



--------



Richard Pike



Kolb MKIII N420P (420ldPoops)



Kingsport, TN 3TN0

 



 



same prop.. no change to pitch. ............ i'm suspecting the carbs. the engine runs smooth up to 4000 rpm, beyond  4000 it bogs down. it is rather old, i wonder if the seals in the carbs are leaking and sucking air?... i have ordered 2 seal kits for the carbs.  stay tuned!



 



       2 broke Tim

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Kolb-List

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