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Another CJ Question

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727gs(at)att.net
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Posted: Mon Nov 09, 2015 2:11 pm Post subject: Another CJ Question

The last couple of times I started it, the prop would occasionally kick backwards during the start. Today I noticed a rough idle after start the went away above about 1500 rpm which I attributed to a fouled plug. After the next start it idled smoothly but after the last, it idled roughly again, despite leaning on the ground.Magnetos?Thanks in advance,Steve near Chicago

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dantpayne(at)icloud.com
Guest

Posted: Mon Nov 09, 2015 2:22 pm Post subject: Another CJ Question

How bout the primer being left to the full left (manual fuel pump selection)

Or perhaps an internal (primer / wobble pump) leak? Would explain the fuel leaking out of the manifold drain upon shutdown and your excessive rich condition fouling the plug...

PS - if you fouled a plug, that would not make the engine run faster. 





On Nov 9, 2015, at 5:08 PM, Stephen Jones <727gs(at)att.net (727gs(at)att.net)> wrote:

 	  Quote: 	
		  The last couple of times I started it, the prop would occasionally kick backwards during the start. Today I noticed a rough idle after start the went away above about 1500 rpm which I attributed to a fouled plug. After the next start it idled smoothly but after the last, it idled roughly again, despite leaning on the ground.



Magnetos?



Thanks in advance,

Steve near Chicago

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727gs(at)att.net
Guest

Posted: Mon Nov 09, 2015 5:17 pm Post subject: Another CJ Question

The checklist I use has me run the engine to 1900 RPM for 10-15 seconds as lean as it will run, pull back the throttle and mixture to low idle and shut down the mags. Steve near Chicago

                                                                                                                                                                                           From:                                                          Stephen Jones <727gs(at)att.net>;                            

                                                              To:                                                          jblake207(at)comcast.net <jblake207(at)comcast.net>;                                                                             

                                                              Subject:                                                          Re: Yak-List: Another CJ Question                            

                                                              Sent:                                                          Tue, Nov 10, 2015 12:59:15 AM                            

     On Monday, November 9, 2015 4:46 PM, "jblake207(at)comcast.net" <jblake207(at)comcast.net> wrote:  

   The rough idle could be from two things... fouled plug as you surmised or these round motors don't run very smooth when cold.  My H6 motor will often run a little rough until it gets a little warm and the blower is then distributing fuel/air mixture to cylinders that are symmetrically warm.  That's my theory anyway. 

   From: "Stephen Jones" <727gs(at)att.net>To: "Yak-List" <yak-list(at)matronics.com>Sent: Monday, November 9, 2015 4:08:01 PMSubject: Another CJ Question 

  The last couple of times I started it, the prop would occasionally kick backwards during the start. Today I noticed a rough idle after start the went away above about 1500 rpm which I attributed to a fouled plug. After the next start it idled smoothly but after the last, it idled roughly again, despite leaning on the ground. 

Magnetos? 

Thanks in advance,Steve near Chicago

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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:

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