---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 09/25/16: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:54 AM - M14P running very rich at idle, stumbling (ggtyler) 2. 10:06 AM - Re: M14P running very rich at idle, stumbling (A. Dennis Savarese) 3. 10:08 AM - Re: M14P running very rich at idle, stumbling (Richard Goode) 4. 10:33 AM - Re: M14P running very rich at idle, stumbling (Rico Jaeger) 5. 10:42 AM - Re: M14P running very rich at idle, stumbling (bill wade) 6. 11:39 AM - Re: M14P running very rich at idle, stumbling (ggtyler) 7. 12:06 PM - Re: Tool Kit (Rob737998) 8. 04:29 PM - Re: M14P running very rich at idle, stumbling (J Rittenbach) 9. 05:23 PM - Re: M14P running very rich at idle, stumbling (ggtyler) ________________________________ Message 1 _____________________________________ Time: 09:54:12 AM PST US Subject: Yak-List: M14P running very rich at idle, stumbling From: "ggtyler" On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke, smells very rich). At low power settings on final, it has a stumble as well. Motor is M14PF, and boost pump is running on the ground, takeoff, and final. I have not performed the Jim Kimball mod to the carb. I've searched the forums, google and the repair manual but see mainly suggestions for the loading up issues and stumble when advancing the throttle. Mine does not stumble when advancing the throttle. What is the best way to lean out the mixture at low RPM's? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=460716#460716 ________________________________ Message 2 _____________________________________ Time: 10:06:59 AM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: M14P running very rich at idle, stumbling The boost pump should not be running on the ground, takeoff and final.=C2 - The boost pump was installed at the Aerostar factory on the TW to elimi nate the manual "system side pump which is/was used to pressurize the fuel system (watch the fuel pressure instrument) prior to starting.=C2- Turn o ff the boost pump and fly the airplane.=C2- The boost pump is flooding th e carburetor.=C2- That should cure the problem.Dennis From: ggtyler To: yak-list@matronics.com Sent: Sunday, September 25, 2016 12:53 PM Subject: Yak-List: M14P running very rich at idle, stumbling On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke, smells very rich). At low power settings on final, it has a stumble as well. Motor is M14PF, and boost pump is running on the ground, takeoff, and final . I have not performed the Jim Kimball mod to the carb. I've searched the forums, google and the repair manual but see mainly sugge stions for the loading up issues and stumble when advancing the throttle. M ine does not stumble when advancing the throttle. What is the best way to lean out the mixture at low RPM's? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=460716#460716 S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 3 _____________________________________ Time: 10:08:54 AM PST US From: "Richard Goode" Subject: RE: Yak-List: M14P running very rich at idle, stumbling Quite simply your carburettor is not set up correctly. The idle adjustment is clearly too rich, and I suspect the "stumble" is caused by an acceleration jet that is too large. And, if it is running too rich at higher power settings, then you will need a larger suction jet. These carburettors are extremely adjustable. Richard Goode -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of ggtyler Sent: 25 September 2016 17:54 Subject: Yak-List: M14P running very rich at idle, stumbling On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke, smells very rich). At low power settings on final, it has a stumble as well. Motor is M14PF, and boost pump is running on the ground, takeoff, and final. I have not performed the Jim Kimball mod to the carb. I've searched the forums, google and the repair manual but see mainly suggestions for the loading up issues and stumble when advancing the throttle. Mine does not stumble when advancing the throttle. What is the best way to lean out the mixture at low RPM's? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=460716#460716 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ________________________________ Message 4 _____________________________________ Time: 10:33:23 AM PST US From: Rico Jaeger Subject: Re: Yak-List: M14P running very rich at idle, stumbling Dennis Savarese, ladies and gentlemen!! Sent from my iPad On Sep 25, 2016, at 12:10 PM, A. Dennis Savarese > wrote: The boost pump should not be running on the ground, takeoff and final. The boost pump was installed at the Aerostar factory on the TW to eliminate th e manual "system side pump which is/was used to pressurize the fuel system (watch the fuel pressure instrument) prior to starting. Turn off the boost pump and fly the airplane. The boost pump is flooding the carburetor. Th at should cure the problem. Dennis ________________________________ From: ggtyler > Sent: Sunday, September 25, 2016 12:53 PM Subject: Yak-List: M14P running very rich at idle, stumbling @gmail.com>> On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke, smells very rich). At low power settings on final, it has a stumble as well. Motor is M14PF, and boost pump is running on the ground, takeoff, and final .. I have not performed the Jim Kimball mod to the carb. I've searched the forums, google and the repair manual but see mainly sugge stions for the loading up issues and stumble when advancing the throttle. M ine does not stumble when advancing the throttle. What is the best way to lean out the mixture at low RPM's? Read this topic online here: http://forums.matronics.com/vi//www.matronics.com/Navigator?Yak-List" targe t="_blank">http://www.matronp; &nhttp://========= ============== ________________________________ Message 5 _____________________________________ Time: 10:42:51 AM PST US From: bill wade Subject: Re: Yak-List: M14P running very rich at idle, stumbling Also just looked on barnstormers and=C2-the TW=C2-has the primer for pi pe and cylinder that primer needs to be in the middle ie straight up and do wn should cyl be selected after starting it continues to dump fuel to the c yl From: A. Dennis Savarese To: "yak-list@matronics.com" Sent: Sunday, September 25, 2016 1:04 PM Subject: Re: Yak-List: M14P running very rich at idle, stumbling The boost pump should not be running on the ground, takeoff and final.=C2 - The boost pump was installed at the Aerostar factory on the TW to elimi nate the manual "system side pump which is/was used to pressurize the fuel system (watch the fuel pressure instrument) prior to starting.=C2- Turn o ff the boost pump and fly the airplane.=C2- The boost pump is flooding th e carburetor.=C2- That should cure the problem.Dennis From: ggtyler To: yak-list@matronics.com Sent: Sunday, September 25, 2016 12:53 PM Subject: Yak-List: M14P running very rich at idle, stumbling On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke, smells very rich). At low power settings on final, it has a stumble as well. Motor is M14PF, and boost pump is running on the ground, takeoff, and final . I have not performed the Jim Kimball mod to the carb. I've searched the forums, google and the repair manual but see mainly sugge stions for the loading up issues and stumble when advancing the throttle. M ine does not stumble when advancing the throttle. What is the best way to lean out the mixture at low RPM's? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=460716#460716http://=== ==================== ________________________________ Message 6 _____________________________________ Time: 11:39:31 AM PST US Subject: Yak-List: Re: M14P running very rich at idle, stumbling From: "ggtyler" Dennis, Thank you for the inside scoop. I must have been advised incorrectly or misunderstood the boost pump usage procedure. I think I had been told that the boost pump was to be running on take off and landing to provide fuel just in case the mechanical fuel pump failed. I will do as you advised, and go from there. My general start up procedure in regards to fuel has been to turn the boost pump on, verify fuel pressure, then prime the engine (knob to the right) as necessary, turn primer knob vertical again and fire up the engine. I've never had to build pressure by turning the primer knob to the left. Other than the stumble at pig rich idle/low rpm's, the engine runs flawlessly. Again, thanks for the help. I'll try turning the boost pump off once running and report back from there if that does not fix the problem. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=460722#460722 ________________________________ Message 7 _____________________________________ Time: 12:06:27 PM PST US Subject: Yak-List: Re: Tool Kit From: "Rob737998" Marc Can't find the Tool kit listed on Ebay what is the reference please. Regards Rob Read this topic online here: http://forums.matronics.com/viewtopic.php?p=460724#460724 ________________________________ Message 8 _____________________________________ Time: 04:29:57 PM PST US From: J Rittenbach Subject: Re: Yak-List: M14P running very rich at idle, stumbling What spark plug are you running? JS Rittenbach > On Sep 25, 2016, at 9:53 AM, ggtyler wrote: > > > On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke, smells very rich). > > At low power settings on final, it has a stumble as well. > > Motor is M14PF, and boost pump is running on the ground, takeoff, and final. > > I have not performed the Jim Kimball mod to the carb. > > I've searched the forums, google and the repair manual but see mainly suggestions for the loading up issues and stumble when advancing the throttle. Mine does not stumble when advancing the throttle. > > What is the best way to lean out the mixture at low RPM's? > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=460716#460716 > > > > > > > > > > ________________________________ Message 9 _____________________________________ Time: 05:23:43 PM PST US Subject: Yak-List: Re: M14P running very rich at idle, stumbling From: "ggtyler" JS Rittenbach: The TW has the auto spark plug conversion with NGK plugs. I'd have to look through the notes, but we used whatever part number John Shuttleworth told us to when he sent us to the store :) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=460729#460729 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.