Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Go Back   VAF Forums > Model Specific > RV-12/RV-12iS
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 12-02-2018, 05:19 PM
n518jh n518jh is offline
Join Date: Jan 2015
Location: Sun City West, AZ
Posts: 46
Default Starting Problems - Second Owner

My 2012 RV0-12 has 380 hours, half from builder, half from me. Recently the plane has become increasingly difficult to start, and now- it won't start. After several tries, after checking one of the carbs for fuel in the bowl, I purchased some starting fluid to see whether the issue is linked to the carbs. spraying a good deal of starting into each carb air filter, when I turned the engine over with full battery power, not a hint of starting. My next step is to pull a spark plug lead and take an new plug, hook it to the lead, hold it on the engine and have someone turn the engine over to look for a spark. Does anyone have better, more experienced opinions on what the sequence should be to track down the problem? The builder is long gone. Mark
Reply With Quote
Old 12-02-2018, 06:03 PM
moosepileit moosepileit is offline
Join Date: Dec 2010
Location: Louisville, KY
Posts: 805

Troubleshooting this engine does not include either starting fluid nor abusing the ignition components.

Please acquire skilled mechanical help familiar with the 91x family. Missing the real problem has already happened.
RV-6, bought from builder.
O-320, slider, carb, mags, FP
Reply With Quote
Old 12-02-2018, 06:40 PM
alexe alexe is offline
Join Date: May 2013
Location: Temecula, CA
Posts: 304

Hi Mark,

You are on the right track. See if there is spark at the plugs. If not, look at the ignition modules. If spark is present, look back at the carbs again to see if the floats are sunk in the bowls and the engine is flooding as a result of that. I would bet my money on that being the cause.

Alex Erdelyi
RV-9A Purchased
RV-12 Built and Sold
Paid through December, 2022
Reply With Quote
Old 12-02-2018, 07:32 PM
KALEWIS's Avatar
Join Date: Nov 2009
Location: Jackson, OH
Posts: 491

Have you experienced ?kickback? when trying to start? Issue could be with a clutch that aids in starting the engine. I apologize for not being specific but I can?t recall the correct nomenclature at the moment.
Airspeed, Altitude, or need at least two

RV-12 #328
At 630 Hrs on the Hobbs
Reply With Quote
Old 12-03-2018, 10:03 AM
EXflyer EXflyer is offline
Join Date: Jan 2016
Location: Chiloquin OR
Posts: 94
Default Hard Start

Never use starting fluid the engine could be internally damaged without showing any signs after starting only to have them show up later say, in flight. Just a whiff could be enough we used it to start some diesel engines but very little even with them.
I agree you need to find a mechanic before proceeding further and watch how he trouble shoots a no start. Also in the long run that prevents another problem I have seen happen, keep replacing parts until it works.
Good luck and there is a lot to learn about and a steep learning curve too. I one time in damp cold weather had an AC, C180, kick a few times then nothing, cause? Damp air, cold weather, spark plugs frosted over had to take the top ones out and warm them up. Seattle weather in the winter cold.

Last edited by EXflyer : 12-03-2018 at 10:06 AM.
Reply With Quote
Old 12-03-2018, 06:56 PM
scottmillhouse's Avatar
scottmillhouse scottmillhouse is offline
Join Date: Apr 2007
Location: Madison, AL
Posts: 350

Before getting excited make sure that you have a good/fully charged battery for adequate cranking speed. A weak battery with a low crank speed may not start a Rotax.
Scott- 2022 donation
New RV-7A N579RV, just over 190 hours now
Built RV-12, 328 hours-sold, purchased RV-12 sold, Built RV-9A, 536 hours-sold, Not completed RV-7 sold, Built Kitfox sold
Reply With Quote
Old 12-03-2018, 08:05 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,296

The only one I experienced hard starting (and I mean almost no starting) was when a west coast ROTAX shop swapped my choke units during carburetor overhaul. Since you didn?t mention any recent carburetor work maybe you have a failed choke or both failed.
Reply With Quote
Old 12-03-2018, 09:19 PM
DaveWelch DaveWelch is offline
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 486

Recommend a search for "hard start" in this (RV-12) forum.

Also, search the Rotax forums.
Join "FlyRotax" if you haven't already
RV12 N951DZ
First Flight 9/23/16!
No paint yet. Working on a scheme with John Deere colors or accents.
Reply With Quote
Old 12-10-2018, 05:43 AM
BigJohn BigJohn is offline
Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,588

Any resplution to the hard starting problem?
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
Master Pilot Award, UFO Member.
RV-12 N37JP 120176, built 2011, sold 2020.
One Week Wonder Build Team, OSH 2018.
Reply With Quote
Old 12-11-2018, 04:40 PM
Azjulian Azjulian is offline
Join Date: Dec 2015
Location: Scottsdale, Arizona
Posts: 207

And are you located at Glendale ? More than happy to take a look for you, we can run through the initial engine linkages and carb setup and return everything back to manual spec to start with.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 06:26 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.