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Europa-List: RE: How to replace 912uls starter motor

To: europa-list@matronics.com
Subject: Europa-List: RE: How to replace 912uls starter motor
From: Erich Trombley <erichdtrombley@juno.com>
Date: Mon, 23 Jun 2025 06:59:48 -0700
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--> Europa-List message posted by: Erich Trombley <erichdtrombley@juno.com>

Hello Ron,

I just finished the job not two days ago.  I have a 914 in a classic with the 
XS engine mount and standard starter.   Download the heavy maintenance manual 
and read the procedure.   Rotax do a good job of explaining the process.   The 
illustrated parts catalog is also helpful to understand the assembly of the 
starter. 

The job is really straight forward but access to the hold down clamp was 
challenging.   I recommend removing the lower cowl to get better access to the 
head of the bolt on the hold down clamp.  

My starter had been in place for over 25 years.  Suggest applying penetrating 
oil to bolt if possible.  Unfortunately, access to the head of the bolt 
precludes using a wrench or socket as the Rotax ring mount is in the way.   I 
used the largest flat head screwdriver that fit in the slot which had a hex 
shaft to allow the application of a wrench.  While pressing hard it keep the 
screwdriver engaged I was able to break the bolt free with by turning the shaft 
of the screwdriver with a wrench.   

Next you will need to unbolt the exhaust bend at the cylinder head (13mm)to 
gain access to the two 8mm mounting nuts which secure the starter to the 
engine.   I found that for the top nut on the exhaust a 12- point thin walled 
socket on a long extension worked really well.   The bottom nut can only be 
removed with an open end wrench.   The 8mm mounting nuts can be easily removed 
with a 12-point box end wrench.  A 6-point box end will not work!  

With the hold down clamp loose and the 8mm nuts removed carefully extract the 
starter from the engine keeping the starter together as an assembly.  I used a 
flat blade screwdriver to gently pry it out of the engine case.  

Do not just pull on starter or the body will separate from the bearing flanges. 
  It’s the 8mm nuts that keep everything together. 

Fish the starter out from the back of the engine mount.  

Reverse the process to install new starter.  The HD starter uses a different 
mounting arrangement and I can’t speak to the ease of installation.  For the 
912ULS the HD is preferred. 

Good luck!

Erich Trombley
N28ET
Classic Monowheel 914

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