---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Fri 08/02/13: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:22 AM - Re: Re: 912UL Will not start on UL91 (Clive Richards) 2. 06:58 AM - Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** (Catz631@aol.com) 3. 07:27 AM - Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** (SIDESLIP) 4. 07:28 AM - Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** (pjeffers) 5. 09:00 AM - Trouble starting a 912 ULS (John Elling) 6. 10:08 AM - Trouble starting a 912 ULS (John Elling) 7. 10:56 AM - 914 Alternator Options (N6ZY) 8. 11:09 AM - Re: 914 Alternator Options (Gilles Thesee) 9. 01:44 PM - Re: 914 Alternator Options (Jan de Jong) 10. 02:43 PM - Re: Trouble starting a 912 ULS (Bob Harrison) ________________________________ Message 1 _____________________________________ Time: 02:22:47 AM PST US From: "Clive Richards" Subject: Re: RotaxEngines-List: Re: 912UL Will not start on UL91 Thanks Roger I passed the information on. The owner arranged for a Rotax maintenance engineer to come to the airfield & he found the starter sprag clutch causing the starting problems and that the soft start had not been connected. No explanation was found as to why it ran rough on the UL91 but runs fine on 100LL & UL91 now so will run on the UL91 to protect the engine from the lead. Clive ----- Original Message ----- From: "Roger Lee" Sent: Saturday, July 13, 2013 5:37 AM Subject: RotaxEngines-List: Re: 912UL Will not start on UL91 > > Hi Clive, > > The temps should have not made any difference between the two fuels. > Something else is going on. I would pull the carb tops off and check the > needle positions. The clips should be in the #3 slot. Third slot down from > the top. If it is in the #2 position it could cause rough running > depending on elevation or altitude. It would be a little lean. Those OAT's > aren't an issue. That's 70F to 84F. While your checking the carbs double > check the bowls and make sure it has had a carb sync. Make sure the plug > gaps are at .023 - .027. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Repair Center - Heavy Maint. Rated > Home 520-574-1080 TRY HOME FIRST > Cell 520-349-7056 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=404585#404585 > > > ________________________________ Message 2 _____________________________________ Time: 06:58:37 AM PST US From: Catz631@aol.com Subject: Re: RotaxEngines-List: Rotax 912ULS Stumble below 4000 RPM on final ONLY** Chad, Sounds to me like you have one of your throttle cables hanging up. By that I mean the internal cable on the outer shroud. I had this happen on my Kitfox during approach throttle reduction. Lubing the cables helped for awhile but then I finally replaced them and that solved my problem. Dick Maddux 912UL ________________________________ Message 3 _____________________________________ Time: 07:27:30 AM PST US Subject: RotaxEngines-List: Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** From: "SIDESLIP" Dick, Thanks for the reply. Makes sense but at the same time doesn't ? It doesn't do it on the ground. Maybe because I'm not going from very high throttle down to 4000 on the ground? Good point though, I'll have to check. Chad -------- C-GYXQ. 912ULS. 601XL-B Read this topic online here: http://forums.matronics.com/viewtopic.php?p=405811#405811 ________________________________ Message 4 _____________________________________ Time: 07:28:12 AM PST US From: pjeffers Subject: RE: RotaxEngines-List: Rotax 912ULS Stumble below 4000 RPM on final ONLY** SnVzdCBhIHN1Z2dlc3Rpb24uICBIYXZlIHlvdSBjaGVja2VkIHlvdXIgY2FyYiB2ZW50IHBpcGVz LiBNYWtlIHN1cmUgdGhleSBhcmUgYm90aCBjb25uZWN0ZWQgdG8gdGhlIHBsZW5udW0gY2hhbWJl ciBhbmQgdGhhdCBuZWl0aGVyIGlzIGJsb2NrZWQuDQpQZXRlIEplZmZlcnMNCg0KLS0tLS1Pcmln aW5hbCBNZXNzYWdlLS0tLS0NCkZyb206IFNJREVTTElQDQpTZW50OiAwMi8wOC8yMDEzIDAyOjM1 DQpUbzogcm90YXhlbmdpbmVzLWxpc3RAbWF0cm9uaWNzLmNvbQ0KU3ViamVjdDogUm90YXhFbmdp bmVzLUxpc3Q6IFJvdGF4IDkxMlVMUyBTdHVtYmxlIGJlbG93IDQwMDAgUlBNIG9uIGZpbmFsIE9O TFkqKg0KDQotLT4gUm90YXhFbmdpbmVzLUxpc3QgbWVzc2FnZSBwb3N0ZWQgYnk6ICJTSURFU0xJ UCIgPENoYWQyMDA3QHJvZ2Vycy5jb20+DQoNCkhlbGxvIGFsbC4gSSd2ZSBnb3QgYSBab2RpYWMg NjAxIFhMLUIgd2l0aCBhIFJvdGF4IDkxMlVMUyBhbmQgYSB3YXJwIGRyaXZlIHRocmVlIGJsYWRl LiANCg0KSXQncyBzZXQgYXQgMTUgZGVncmVlcyBwaXRjaCwgZ2l2aW5nIG1lIDU1MDAgUlBNIENM SU1CIE9VVCwgNTIwMC01MzAwIHN0YXRpYy4gVGhpcyBlbmdpbmUgcnVucyBmbGF3bGVzc2x5IG9u IHRoZSBncm91bmQuIEl0IGhhcyBvbmx5IDE3NSBob3VycyBvbiB0aGUgZW5naW5lLiBOZXcgcGx1 Z3MsIGNhcmJzIHN5bmNlZCwgb2lsIGNoYW5nZWQuIEZyZXNoIGZ1ZWwgbGluZXMuIEFsbCBwYXJh bWV0ZXJzIGFyZSB3ZWxsIHdpdGhpbiBtYXJnaW5zLiBDbGltYnMgYW5kIHJ1bnMgbGlrZSBhIHRv cCwgYW5kIGlzIGhhcHB5IGF0IDU1MDAgY3J1aXNlLiBUaGUgYWlycGxhbmUgZG9lcyAxMDAtMTEw a3RzIHN0cmFpZ2h0IGFuZCBsZXZlbCBhdCA1NTAwIHJwbS4gRnVlbCBidXJuIGlzIGFwcHJveGlt YXRlIGF0IDMuNS00LjEgZ2FsL2hyLiANCg0KSSBmbHkgbXkgcGF0dGVybiBhdCA5MGt0cywgd2l0 aCA3MC04MCBvbiBmaW5hbC4gDQoNCldoZW4gSSBwdWxsIHRoZSBwb3dlciBiYWNrIGdyYWR1YWxs eSB0byBzbG93IGl0IGZvciBmbGFwcyBhbmQgdHVybmluZyBiYXNlLCBhbnl0aGluZyB1bmRlciA0 ayBhbmQgaXQgc2hha2VzIGFuZCB0aHVkcy4gTWF5YmUgdGhhdCBzcGVlZCB1bmxvYWRzIHRoZSBw cm9wPyBJIGRvbid0IGtub3cuIExpa2UgSSBzYWlkLCBydW5zIGxpa2UgYSB0b3Agb24gdGhlIGdy b3VuZC4gSXQncyBvbmx5IHJ1bm5pbmcgbGlrZSBhIGJhZyBvZiBoYW1tZXJzIGluIHRoZSBjaXJj dWl0IHB1bGxpbmcgYmFjayB1bmRlciA0ay4gSXQgaXMgYSBzbGlwcGVyIGNsdXRjaGVkIHBsYW5l LiANCg0KQW55IGhlbHAgaXMgYXBwcmVjaWF0ZWQhDQoNClRoYW5rcyBpbiBhZHZhbmNlIQ0KDQpD aGFkDQoNCi0tLS0tLS0tDQpDLUdZWFEuIDkxMlVMUy4gNjAxWEwtQg0KDQoNCg0KDQpSZWFkIHRo aXMgdG9waWMgb25saW5lIGhlcmU6DQoNCmh0dHA6Ly9mb3J1bXMubWF0cm9uaWNzLmNvbS92aWV3 dG9waWMucGhwP3A9NDA1Nzk1IzQwNTc5NQ0KDQoNCg0KDQoNCg0KDQpfLT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQ0KXy09ICAgICAg ICAgIC0gVGhlIFJvdGF4RW5naW5lcy1MaXN0IEVtYWlsIEZvcnVtIC0NCl8tPSBVc2UgdGhlIE1h dHJvbmljcyBMaXN0IEZlYXR1cmVzIE5hdmlnYXRvciB0byBicm93c2UNCl8tPSB0aGUgbWFueSBM aXN0IHV0aWxpdGllcyBzdWNoIGFzIExpc3QgVW4vU3Vic2NyaXB0aW9uLA0KXy09IEFyY2hpdmUg U2VhcmNoICYgRG93bmxvYWQsIDctRGF5IEJyb3dzZSwgQ2hhdCwgRkFRLA0KXy09IFBob3Rvc2hh cmUsIGFuZCBtdWNoIG11Y2ggbW9yZToNCl8tPQ0KXy09ICAgLS0+IGh0dHA6Ly93d3cubWF0cm9u aWNzLmNvbS9OYXZpZ2F0b3I/Um90YXhFbmdpbmVzLUxpc3QNCl8tPQ0KXy09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0NCl8tPSAgICAg ICAgICAgICAgIC0gTUFUUk9OSUNTIFdFQiBGT1JVTVMgLQ0KXy09IFNhbWUgZ3JlYXQgY29udGVu dCBhbHNvIGF2YWlsYWJsZSB2aWEgdGhlIFdlYiBGb3J1bXMhDQpfLT0NCl8tPSAgIC0tPiBodHRw Oi8vZm9ydW1zLm1hdHJvbmljcy5jb20NCl8tPQ0KXy09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0NCl8tPSAgICAgICAgICAgICAtIExp c3QgQ29udHJpYnV0aW9uIFdlYiBTaXRlIC0NCl8tPSAgVGhhbmsgeW91IGZvciB5b3VyIGdlbmVy b3VzIHN1cHBvcnQhDQpfLT0gICAgICAgICAgICAgICAgICAgICAgICAgICAgICAtTWF0dCBEcmFs bGUsIExpc3QgQWRtaW4uDQpfLT0gICAtLT4gaHR0cDovL3d3dy5tYXRyb25pY3MuY29tL2NvbnRy aWJ1dGlvbg0KXy09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT0NCg0KDQoNCg= ________________________________ Message 5 _____________________________________ Time: 09:00:29 AM PST US From: John Elling Subject: RotaxEngines-List: Trouble starting a 912 ULS Folks, I've gradually had trouble starting a ULS with the 912 Rotax high torque starter. First it did not like starting when it was cold. Then the sprag seemed to come disengaged without turning the engine over enough to start. Finally I started getting a gear-grinding noise. Then eventually the gears never engaged; just a grinding noise. I checked the starter alignment between the two ears for the bolts. Perhaps a 0.010" difference between the gaps of the two ears and no way to adjust that I could see since the ears of the starter flange are threaded as are the bolt holes on the engine. I removed the Rotax starter and found the gear surface was a little rough as was the mating gear teeth inside the engine. Probably from the grinding... I replaced the starter with a Skytec, aligned as best I could to exactly the same position as the Rotax starter (off about 0.010" between the top and bottom ears of the starter flange and the engine surface). The Skytec starter does exactly the same thing - grinds the gears without really engaging. Anyone have any ideas? Anything I should check before I start taking apart the engine to get to the starter gears and clutch? John ________________________________ Message 6 _____________________________________ Time: 10:08:24 AM PST US From: John Elling Subject: RotaxEngines-List: Trouble starting a 912 ULS Folks, One more data point on the trouble starting: It is not the battery current. I've connected a truck battery in parallel with the plane's battery (so the ignition is switching more amps) and not solved the problem. John ________________________________ Message 7 _____________________________________ Time: 10:56:00 AM PST US Subject: RotaxEngines-List: 914 Alternator Options From: "N6ZY" I am building a Europa with a Rotax 914 engine. It has become clear to me that my electrical power needs are unlikely to be met from the internal alternator. The alternatives are the Rotax belt driven alternator, or the B&C SD20 alternator driven off the vacuum pad. The belt driven alternator goes where I would really like my air intake hoses to go, so the SD20 looks like an attractive option. However when I look at my vacuum pad, it has a blanking plate, so I assume that I would have to install the vacuum drive gear shaft. Is this correct and can anyone advise me as to how difficult this is? Is it something that I can do myself or, as it seems to require opening the gearbox, is this a Rotax service center job? Thanks. Jerry Fisher Read this topic online here: http://forums.matronics.com/viewtopic.php?p=405824#405824 ________________________________ Message 8 _____________________________________ Time: 11:09:30 AM PST US From: Gilles Thesee Subject: Re: RotaxEngines-List: 914 Alternator Options N6ZY a crit : > > I am building a Europa with a Rotax 914 engine. It has become clear to me that my electrical power needs are unlikely to be met from the internal alternator. The alternatives are the Rotax belt driven alternator, or the B&C SD20 alternator driven off the vacuum pad. The belt driven alternator goes where I would really like my air intake hoses to go, so the SD20 looks like an attractive option. However when I look at my vacuum pad, it has a blanking plate, so I assume that I would have to install the vacuum drive gear shaft. Is this correct and can anyone advise me as to how difficult this is? Is it something that I can do myself or, as it seems to require opening the gearbox, is this a Rotax service center job? Thanks. > > Jerry, Have you considered this option ? http://contrails.free.fr/elec_second_alternateur.php Best regards, -- Gilles http://contrails.free.fr ________________________________ Message 9 _____________________________________ Time: 01:44:38 PM PST US From: Jan de Jong Subject: Re: RotaxEngines-List: 914 Alternator Options And there is this: http://www.flygas.info/en/kit-double-alternator-for-rotax.html Better as a 10A backup than additional power it seems to me. Jan de Jong On 8/2/2013 8:09 PM, Gilles Thesee wrote: > > > N6ZY a crit : >> >> I am building a Europa with a Rotax 914 engine. It has become clear >> to me that my electrical power needs are unlikely to be met from the >> internal alternator. The alternatives are the Rotax belt driven >> alternator, or the B&C SD20 alternator driven off the vacuum pad. The >> belt driven alternator goes where I would really like my air intake >> hoses to go, so the SD20 looks like an attractive option. However >> when I look at my vacuum pad, it has a blanking plate, so I assume >> that I would have to install the vacuum drive gear shaft. Is this >> correct and can anyone advise me as to how difficult this is? Is it >> something that I can do myself or, as it seems to require opening the >> gearbox, is this a Rotax service center job? Thanks. >> > > Jerry, > > Have you considered this option ? > > http://contrails.free.fr/elec_second_alternateur.php > > Best regards, ________________________________ Message 10 ____________________________________ Time: 02:43:53 PM PST US From: "Bob Harrison" Subject: RE: RotaxEngines-List: Trouble starting a 912 ULS Hi! John, Where is your battery situated ? How far from the starter ? I had untold problems with the Jabiru 3300 six cylinder until I put two Odessey 13Ah batteries in parallel within 18" of the starter and used welding cables for the leads. Bingo not so much as a problem since. Regards Bob Harrison G-PTAG Europa now with 914 Rotax. -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of John Elling Sent: 02 August 2013 18:08 Subject: RotaxEngines-List: Trouble starting a 912 ULS --> Folks, One more data point on the trouble starting: It is not the battery current. I've connected a truck battery in parallel with the plane's battery (so the ignition is switching more amps) and not solved the problem. John ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-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/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-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.