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  #1  
Old 08-24-2021, 03:12 PM
Cyclone Cyclone is offline
 
Join Date: Dec 2014
Location: Grinnell,IA
Posts: 58
Default Rotax plugs

Iím approaching a 200 hour spark plug change on my 912ULS
The factory plugs are Rotax double electrode compared to the NGK single
electrode referred to in search results. Thereís a significant cost spread
which Iím okay with if thereís a performance difference. My existing
plugs have been trouble free and look like new. Any comparison results out
there?
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  #2  
Old 08-24-2021, 06:12 PM
rk2436 rk2436 is offline
 
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Location: chicago,ol
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The NGKís are fine. SLSA would probably require the $$ Rotax plugs.
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  #3  
Old 08-24-2021, 07:37 PM
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Piper J3 Piper J3 is online now
 
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Default

Quote:
Originally Posted by Cyclone View Post
Iím approaching a 200 hour spark plug change on my 912ULS My existing plugs have been trouble free and look like new.

Why not continue to run existing plugs?
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  #4  
Old 08-25-2021, 06:24 AM
Dennis S. Dennis S. is offline
 
Join Date: Dec 2020
Location: Germany
Posts: 4
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The current version of the parts catalog from Rotax still lists the old plugs (with the Rotax part number, not with the NGK designation) with status s.v., that is "still valid".
Also from the parts catalog: "s.v. | still valid, part was replaced by compatible component and can not be supplied any longer by the producer. Existing stock may be used."

We have used the new plugs for a short period and not seen any performance difference. That was on a motorglider and a few ultralight planes. We have been switching back to NGK since then. Can't remember any problems with either type of plugs.

By the way, the most recent maintenance manual allows for 400 hours between spark plug replacements when using lead-free fuel. It doesn't specifically tell whether this applies only for the new plugs or also for the NGK plugs, so use that information at your own discretion.
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  #5  
Old 08-25-2021, 06:54 AM
bobg56 bobg56 is offline
 
Join Date: Nov 2018
Location: Peachtree City, GA
Posts: 195
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My 200 hour NGK plugs looked in great shape, they should go 400 hours no problem.
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  #6  
Old 08-25-2021, 09:06 AM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 999
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When switching spark plugs back and forth between NGKs and ROTAX-branded plugs you may find that you have to change the spark plug connector boots.

https://legacy.rotaxowner.com/si_tb_...si-912-027.pdf
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  #7  
Old 08-25-2021, 10:12 AM
mbell mbell is offline
 
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Posts: 151
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I just switched out my Rotax-brand plugs at 200 hours. I run strictly mogas but 400 hours seemed like pushing it. Changed to the standard auto plugs. The connectors fit fine. Just don't mix and match Rotax and NGK plugs; it's all or none.
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  #8  
Old 08-26-2021, 08:49 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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I just replace mine every annual. Theyíre too cheap to worry about the cost.
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