---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 06/08/15: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:18 AM - Re: Re: 912 rough running below 3000 rpm (Flynn Elliott) 2. 06:35 AM - Re: Re: 912 rough running below 3000 rpm (OS) 3. 07:02 AM - Re: Re: 912 rough running below 3000 rpm (OS) 4. 07:12 AM - Re: 912 rough running below 3000 rpm (Roger Lee) 5. 08:49 AM - Re: Re: 912 rough running below 3000 rpm (Flynn Elliott) 6. 08:51 AM - Re: Re: 912 rough running below 3000 rpm (Flynn Elliott) ________________________________ Message 1 _____________________________________ Time: 05:18:05 AM PST US From: "Flynn Elliott" Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm Hi Roger, Carbs now stripped again, thoroughly cleaned out , new o rings ect. Roughness at idle remains the same. Just for the hell of it we turned the mixture screw in to lean the mixture, at just on 1/2 a turn out I now have a very smooth idle ! rpm through the rest of the range is unafected. Will I be running the motor to lean , from what info I get the mixture screw only effects low rpm operation i.e idle. Thanks Flynn -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee Sent: 04 June 2015 02:32 AM Subject: RotaxEngines-List: Re: 912 rough running below 3000 rpm The 912UL and ULS are the same measurements. They are the same carbs just different jetting. When the carbs come off you must flush through every orifice and jet in the bowl and carb body and leave no stone unturned. It only takes a very tiny piece of debris to cause this rough running. Your symptoms do sound like you move a piece of debris, but after it runs it moves again. I absolutely know you don't want to hear this, but I think you missed something on the cleaning. Every little hole and crevice needs to be flushed then blown out with air. Blow the air in more than one direction where possible. I have seen a few owners have difficulty here because they left one stone unturned. Thanks for the vote of confidence, but no "Oracle" here just an owner like everyone else and happy to pass on what I learn in all the Rotax schools and what I have been able to see over the years. matter of fact I just spent all last week back at Rotax for another school. -------- Roger Lee Tucson, Az. Rotax Instructor & Rotax IRC Light Sport Repairman Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=442958#442958 ----- No virus found in this message. Checked by AVG - www.avg.com ________________________________ Message 2 _____________________________________ Time: 06:35:00 AM PST US From: "OS" Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm Flynn, There is a product called "Colortune spark plug". You can't use them under load but it's really neat device for setting mixtures. I used them extensively in the distant past tuning Weber and Dell'Orto carbs. Among others, Amazon sells them here http://www.amazon.com/Colortune-for-14mm-Spark-Plug/dp/B000E9VGNM This one's a 14mm thread size. Regards, Otto Szorenyi -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Flynn Elliott Sent: Monday, June 08, 2015 08:17 Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm --> Hi Roger, Carbs now stripped again, thoroughly cleaned out , new o rings ect. Roughness at idle remains the same. Just for the hell of it we turned the mixture screw in to lean the mixture, at just on 1/2 a turn out I now have a very smooth idle ! rpm through the rest of the range is unafected. Will I be running the motor to lean , from what info I get the mixture screw only effects low rpm operation i.e idle. Thanks Flynn -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee Sent: 04 June 2015 02:32 AM Subject: RotaxEngines-List: Re: 912 rough running below 3000 rpm --> The 912UL and ULS are the same measurements. They are the same carbs just different jetting. When the carbs come off you must flush through every orifice and jet in the bowl and carb body and leave no stone unturned. It only takes a very tiny piece of debris to cause this rough running. Your symptoms do sound like you move a piece of debris, but after it runs it moves again. I absolutely know you don't want to hear this, but I think you missed something on the cleaning. Every little hole and crevice needs to be flushed then blown out with air. Blow the air in more than one direction where possible. I have seen a few owners have difficulty here because they left one stone unturned. Thanks for the vote of confidence, but no "Oracle" here just an owner like everyone else and happy to pass on what I learn in all the Rotax schools and what I have been able to see over the years. matter of fact I just spent all last week back at Rotax for another school. -------- Roger Lee Tucson, Az. Rotax Instructor & Rotax IRC Light Sport Repairman Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=442958#442958 ----- No virus found in this message. Checked by AVG - www.avg.com ________________________________ Message 3 _____________________________________ Time: 07:02:28 AM PST US From: "OS" Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm Flynn, While looking around on the Net I also found this interesting looking toy that might interest you. http://www.americanmuscle.com/plx-dm6-afr-sensor-module-combo.html Otto S. -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Flynn Elliott Sent: Monday, June 08, 2015 08:17 Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm --> Hi Roger, Carbs now stripped again, thoroughly cleaned out , new o rings ect. Roughness at idle remains the same. Just for the hell of it we turned the mixture screw in to lean the mixture, at just on 1/2 a turn out I now have a very smooth idle ! rpm through the rest of the range is unafected. Will I be running the motor to lean , from what info I get the mixture screw only effects low rpm operation i.e idle. Thanks Flynn ________________________________ Message 4 _____________________________________ Time: 07:12:13 AM PST US Subject: RotaxEngines-List: Re: 912 rough running below 3000 rpm From: "Roger Lee" Hi Flynn, The mixture screw is more for the low rpm. When you cleaned the carbs did you remove the mixture screw on the bottom and blow through this orifice? Did you remove or at least blow through the mixture jet located in the corner of the bowl in both directions? Is the mixture screw now out 1.5 turns and was it when all this started? If you put a set of carb sync gauges on do the carbs sync at idle or is one carb considerably off over the other? -------- Roger Lee Tucson, Az. Rotax Instructor & Rotax IRC Light Sport Repairman Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=443218#443218 ________________________________ Message 5 _____________________________________ Time: 08:49:08 AM PST US From: "Flynn Elliott" Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee Sent: 08 June 2015 04:12 PM Subject: RotaxEngines-List: Re: 912 rough running below 3000 rpm Hi Flynn, The mixture screw is more for the low rpm. When you cleaned the carbs did you remove the mixture screw on the bottom and blow through this orifice? Yes Did you remove or at least blow through the mixture jet located in the corner of the bowl in both directions? Yes,removed and pumped fuel and air from both ends. Is the mixture screw now out 1.5 turns and was it when all this started? No, just .5 out at the moment to get smooth idle, at 1 .5 idle is rough. Setting was 1.5 before this started, prior to this issue they have never been touched. If you put a set of carb sync gauges on do the carbs sync at idle or is one carb considerably off over the other? Carb sync gauges are on the way to me, should have them in a few days. Thanks Flynn -------- Roger Lee Tucson, Az. Rotax Instructor & Rotax IRC Light Sport Repairman Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=443218#443218 ----- No virus found in this message. Checked by AVG - www.avg.com ________________________________ Message 6 _____________________________________ Time: 08:51:29 AM PST US From: "Flynn Elliott" Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm Thanks Otto. -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of OS Sent: 08 June 2015 04:01 PM Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm Flynn, While looking around on the Net I also found this interesting looking toy that might interest you. http://www.americanmuscle.com/plx-dm6-afr-sensor-module-combo.html Otto S. -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Flynn Elliott Sent: Monday, June 08, 2015 08:17 Subject: RE: RotaxEngines-List: Re: 912 rough running below 3000 rpm --> Hi Roger, Carbs now stripped again, thoroughly cleaned out , new o rings ect. Roughness at idle remains the same. Just for the hell of it we turned the mixture screw in to lean the mixture, at just on 1/2 a turn out I now have a very smooth idle ! rpm through the rest of the range is unafected. Will I be running the motor to lean , from what info I get the mixture screw only effects low rpm operation i.e idle. Thanks Flynn ----- No virus found in this message. 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