---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Thu 10/11/12: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:08 AM - Re: Re: Rotax 912 UL - Re-starting Problem (Hugh McKay) 2. 11:46 AM - Re: Rotax 912 UL - Re-starting Problem (Roger Lee) 3. 10:29 PM - 912 UL vibration (U) ________________________________ Message 1 _____________________________________ Time: 09:08:17 AM PST US From: "Hugh McKay" Subject: Re: RotaxEngines-List: Re: Rotax 912 UL - Re-starting Problem Roger, I don't quite understand your first sentence. Please explain in further detail. Carbs have not been "rebuilt" since new (550 hours on the carbs - 5 years and 3 months ). I guess to check the floats to see if one is "sinking" just take the bowl off and fill it with gas and see if the float "floats" or "sinks". Right? I will check the plug gap. Old original fuel pump. I do have a fuel recirculation line. Hugh G. McKay III, P.E. Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 Ph. 704-661-8271 Fax 704-483-5466 email hgmckay@bellsouth.net http://www.wwegeo.com -----Original Message----- From: Roger Lee Sent: Wednesday, October 10, 2012 9:53 PM Subject: RotaxEngines-List: Re: Rotax 912 UL - Re-starting Problem Hi Hugh, Make sure the float level in the carbs are at 10.5mm in height from the outside edge of the carb. When were the carbs last rebuilt? If it is over 5 years regardless of hours you may want to do an overhaul. Check the floats and make sure one isn't sinking (flooding) under pressure right after you stop. Plug gap between .023 - .027 and not over 75 hours old. new fuel pump or old? Do you have a fuel re-circulation line? -------- 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=385088#385088 ________________________________ Message 2 _____________________________________ Time: 11:46:32 AM PST US Subject: RotaxEngines-List: Re: Rotax 912 UL - Re-starting Problem From: "Roger Lee" Hi Hugh, To check float levels you do just remove the bowls and put fuel in with the floats. The float pins should be equal to the fuel level. To check the float arm level you need to turn the carb upside down. Place a mm ruler and place it on the edge of the carb and measure the distance of the float arm up on the ruler. The proper height is 10.5mm. This controls fuel level in the bowl which has a big impact on the way the engine runs. -------- 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=385122#385122 ________________________________ Message 3 _____________________________________ Time: 10:29:29 PM PST US Subject: RotaxEngines-List: 912 UL vibration From: U Hello List Yesterday I started the engine on the Kitfox IV I'm rebuilding. It's a 912UL from 1997 with 375 hours that I purchased about 6 months back. Before i purchased it, was checked by a qualified Rotax mechanic who among other things, changed a number of rubber parts. Before starting it, I manually checked the carb valves so that they were visually in a similar position. Anyway, the engine seems to have a rather strong vibration to it so I haven't run it for much more than 20-30 seconds at the time. I haven't had the carb valves aligned exactly with a pressure gauge, but the vibration is much more than what I would expect if it were just due to carb misalignment. And it doesn't seem to be the prop (a 3-blade Duc whose pitch has been set with the appropriate instrument). I called the Rotax mechanic who checked it and he suggested checking the carbs for obstructions which I have now done (I found an insect inside the left carb, but that didnt seem to change anything). I'll blow some compressed air through them today just to make sure that everything is clean. Does anyone have any suggestions as to what I could try next? The closest Rotax mechanic is a 5 hour drive from where I am in Sicily so I don't want to call him out before I have tried everything that I can do personally. 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