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spark plug caps for 912UL

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Dick Maddux

Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

Posted: Tue Jan 15, 2013 5:03 am Post subject: spark plug caps for 912UL

I am in the process of changing the spark plug wires on my older 912 UL  (mid 90's). I am also doing a resistance check on the caps and have found at  least one of them out of the Rotax lower limits (4400 ohms) . All of them  so far have run about 4600 ohms vs the 5000 they should be. 

  Is there someplace I can buy NGK VDO5FMH plug caps without paying the  almost $50 a piece that Rotax charges ? I can get  VDO5EMH caps on line for  about $7 each but I believe they take solid tip plugs vs the threaded that Rotax  calls for.

  I have not been able to locate the "F" caps either locally or "on  line"

                                                      

                                                                      Thanks,

                                                                       Dick Maddux

                                                                       912UL

                                                                      Milton,Fl   

  

 [quote][b]

davidjoyce(at)doctors.org
Guest

Posted: Tue Jan 15, 2013 5:13 am Post subject: spark plug caps for 912UL

Dick, Try Google - In UK lots come up at prices under £10. 

Regards, David Joyce



On Tue, 15 Jan 2013 08:02:26 -0500 (EST)

  Catz631(at)aol.com wrote:

 	  Quote: 	
		   I am in the process of changing the spark plug wires on 

my older 912 UL  

 (mid 90's). I am also doing a resistance check on the 

caps and have found at  

 least one of them out of the Rotax lower limits (4400 

ohms) . All of them  

 so far have run about 4600 ohms vs the 5000 they should 

be. 

 Is there someplace I can buy NGK VDO5FMH plug caps 

without paying the  

 almost $50 a piece that Rotax charges ? I can get 

 VDO5EMH caps on line for  

 about $7 each but I believe they take solid tip plugs vs 

the threaded that 

 Rotax  calls for.

 I have not been able to locate the "F" caps either 

locally or "on  line"

                                                    

                                                           

          Thanks,

                                                           

           Dick 

 Maddux

                                                           

           912UL

                                                           

          

 Milton,Fl

Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Tue Jan 15, 2013 6:04 am Post subject: Re: spark plug caps for 912UL

Hi Dick.

Just out of interest what problem are you getting with your plugs,

is it miss firing ??

Alan

rlborger(at)mac.com
Guest

Posted: Tue Jan 15, 2013 8:12 am Post subject: spark plug caps for 912UL

Dick,



Did some searching and found a french company, LorAvia, which sells them for 11.00 € or about $14.68 each.

http://loravia.com/shop/en/spark-plug-connector-vdo5fmh-nc?keyword=VDO5FMH&description=true&model=1 

If it comes up in French, click on the Brit flag in the upper right and search on the part number.

I haven't found any US dealers other than the Rotax dealers who want $50+/- each for them.

Hopefully, someone else can come up with a U.S. source at a reasonable price.



 Blue skies & tailwinds,

Bob Borger

Europa XS Tri, Rotax 914, Airmaster C/S Prop.

Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

3705 Lynchburg Dr.

Corinth, TX  76208-5331

Cel: 817-992-1117

rlborger(at)mac.com (rlborger(at)mac.com)



 

 

On Jan 15, 2013, at 7:02 AM, Catz631(at)aol.com (Catz631(at)aol.com) wrote:

     I am in the process of changing the spark plug wires on my older 912 UL  (mid 90's). I am also doing a resistance check on the caps and have found at  least one of them out of the Rotax lower limits (4400 ohms) . All of them  so far have run about 4600 ohms vs the 5000 they should be. 

  Is there someplace I can buy NGK VDO5FMH plug caps without paying the  almost $50 a piece that Rotax charges ? I can get  VDO5EMH caps on line for  about $7 each but I believe they take solid tip plugs vs the threaded that Rotax  calls for.

  I have not been able to locate the "F" caps either locally or "on  line"

                                                      

                                                                      Thanks,

                                                                       Dick Maddux

                                                                       912UL

                                                                      Milton,Fl

artglaser(at)sbcglobal.ne
Guest

Posted: Tue Jan 15, 2013 10:12 am Post subject: spark plug caps for 912UL

Is it possible that there is a substitute from the world of motorcycles?

   From: Robert Borger <rlborger(at)mac.com>

To: rotaxengines-list(at)matronics.com

Sent: Tue, January 15, 2013 10:22:02 AM

Subject: Re: spark plug caps for 912UL

Dick,  

 Did some searching and found a french company, LorAvia, which sells them for 11.00 â‚¬ or about $14.68 each.

 http://loravia.com/shop/en/spark-plug-connector-vdo5fmh-nc?keyword=VDO5FMH&description=true&model=1 

 If it comes up in French, click on the Brit flag in the upper right and search on the part number.

 I haven't found any US dealers other than the Rotax dealers who want $50+/- each for them.

 Hopefully, someone else can come up with a U.S. source at a reasonable price.

   Blue skies & tailwinds,

 Bob Borger

Europa XS Tri, Rotax 914, Airmaster C/S Prop.

Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

3705 Lynchburg Dr.

Corinth, TX  76208-5331

Cel: 817-992-1117

rlborger(at)mac.com (rlborger(at)mac.com)

  On Jan 15, 2013, at 7:02 AM, Catz631(at)aol.com (Catz631(at)aol.com) wrote:

  I am in the process of changing the spark plug wires on my older 912 UL (mid 90's). I am also doing a resistance check on the caps and have found at least one of them out of the Rotax lower limits (4400 ohms) . All of them so far have run about 4600 ohms vs the 5000 they should be. 

  Is there someplace I can buy NGK VDO5FMH plug caps without paying the almost $50 a piece that Rotax charges ? I can get  VDO5EMH caps on line for about $7 each but I believe they take solid tip plugs vs the threaded that Rotax calls for.

  I have not been able to locate the "F" caps either locally or "on line"

                                                                     Thanks,

                                                                      Dick Maddux

                                                                      912UL

                                                                      Milton,Fl 

 [quote][b]

davidjoyce(at)doctors.org
Guest

Posted: Tue Jan 15, 2013 10:41 am Post subject: spark plug caps for 912UL

NGK VD05FMH caps seem to be available for a mere $6.30 

each from www.ngk.com/product.aspx?zpid 087  Regards 

David Joyce

On Tue, 15 Jan 2013 10:11:45 -0800 (PST)

  Arthur Glaser <artglaser(at)sbcglobal.net> wrote:

 	  Quote: 	
		   Is it possible that there is a substitute from the world 

of motorcycles?

 

 

 

 

 ________________________________

From: Robert Borger <rlborger(at)mac.com>

 To: rotaxengines-list(at)matronics.com

 Sent: Tue, January 15, 2013 10:22:02 AM

 Subject: Re: spark plug caps for 

912UL

 

 Dick, 

 

 Did some searching and found a french company, LorAvia, 

which sells them for 

 11.00 € or about $14.68 each.

 

 http://loravia.com/shop/en/spark-plug-connector-vdo5fmh-nc?keyword=VDO5FMH&description=true&model=1 

 

 

 If it comes up in French, click on the Brit flag in the 

upper right and search 

 on the part number.

 

 I haven't found any US dealers other than the Rotax 

dealers who want $50+/- each 

 for them.

 

 Hopefully, someone else can come up with a U.S. source 

at a reasonable price.

 

 

 Blue skies & tailwinds,

 Bob Borger

 Europa XS Tri, Rotax 914, Airmaster C/S Prop.

 Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 

EXP

 3705 Lynchburg Dr.

 Corinth, TX  76208-5331

 Cel: 817-992-1117

 rlborger(at)mac.com

 

 On Jan 15, 2013, at 7:02 AM, Catz631(at)aol.com wrote:

 

 I am in the process of changing the spark plug wires on 

my older 912 UL (mid 

 90's). I am also doing a resistance check on the caps 

and have found at least 

 one of them out of the Rotax lower limits (4400 ohms) . 

All of them so far have 

 run about 4600 ohms vs the 5000 they should be. 

 

  Is there someplace I can buy NGK VDO5FMH plug caps 

without paying the almost 

 $50 a piece that Rotax charges ? I can get  VDO5EMH caps 

on line for about $7 

 each but I believe they take solid tip plugs vs the 

threaded that Rotax calls 

 for.

  I have not been able to locate the "F" caps either 

locally or "on line"

                                                     

                                                                     

Thanks,

                                                                      

Dick Maddux

                                                                      

912UL

                                                                      Milton,Fl

hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Tue Jan 15, 2013 10:56 am Post subject: spark plug caps for 912UL

It is not clear to me from the information given on these caps that they are 

specifically for fitting the threaded end of the spark plug after the tip is 

removed (as required by Rotax), or if they are for fitting over the cap that 

comes on the plug. Can you answer this?



Hugh G. McKay III, P.E.

Allegro 2000

Rotax 912 UL



--

ledson

Joined: 29 Apr 2009
Posts: 62

Posted: Tue Jan 15, 2013 11:43 am Post subject: Re: spark plug caps for 912UL

Hugh, 



I've attached a part number buildup guide from NGK so that you can see how the part numbers are assigned.  By using the guide you can determine the specification for each resistor cover.

Resistor_Covers.pdf

Description:

Download

Filename:

Resistor_Covers.pdf

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197.68 KB

Downloaded:

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davidjoyce(at)doctors.org
Guest

Posted: Tue Jan 15, 2013 1:08 pm Post subject: spark plug caps for 912UL

Hugh, couldn't say, but at that prie why not buy one & 

check tht it is the same item?

DJ



On Tue, 15 Jan 2013 13:55:59 -0500

  "Hugh McKay" <hgmckay(at)bellsouth.net> wrote:

[quote] 

<hgmckay(at)bellsouth.net>

 

 It is not clear to me from the information given on 

these caps that they are specifically for fitting the 

threaded end of the spark plug after the tip is removed 

(as required by Rotax), or if they are for fitting over 

the cap that comes on the plug. Can you answer this?

 

 Hugh G. McKay III, P.E.

 Allegro 2000

 Rotax 912 UL

 

 --

Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Wed Jan 16, 2013 4:41 am Post subject: Re: spark plug caps for 912UL

If you end up with the type caps that are sized for the plugs with the screw-on tips in place, you can buy the screw-on tips separately, or take them off of NGK plugs that are sold at most automotive stores.



FWIW, Jabiru engines use 12mm NGK plugs but a different series than Rotax. Jabiru plugs have the screw-on tips.

_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Wed Jan 16, 2013 5:20 am Post subject: spark plug caps for 912UL

Many thanks for the link to the NGK Resistor Covers. From the information 

shown the letter code for the proper cover for the threaded end of the 

DCPR7E spark plug is the letter F. Do you agree?



Hugh G. McKay III, P.E.

Allegro 2000

N661WW

Rotax 912 UL



--

Dick Maddux

Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

Posted: Wed Jan 16, 2013 6:12 am Post subject: spark plug caps for 912UL

Thanks for all of your replies ! 

 The reason I replaced the spark plug wires was due to a miss on my  left mag. It was misfiring badly !

  On two previous occasions I had  breaks in the red coil wire  from the back of the engine (coil power to the module) and thought that it had  broken again but that was not the case,

  I switched modules and the problem remained on the left mag (A module  in my case)

  I then decided to change the HD wires as I do have an old engine (the  wires have 1992 printed on them) The spark plugs were changed on the A plugs but  that didn't help either. I also checked the resistance on the dual coils  (secondary) and that was good.

  I also decided to check the caps for resistance and found them  all in the Rotax specs except for one (4400-6000 ohms) They were all at the low  end however (about 4500)So now I will be changing the caps also.

  The wire ( aprox 16ft) was about $35 a meter from Rotax and the caps  about $50 ea ! I believe that aprox $575 is a bit much to pay for a  new  spark plug harness !!! 

  Anyway I was able to get Rotax wire from Spruce for $1.17 a foot and  ended up buying 8 caps for $47 including shipping (the price for 1 from  Rotax) The caps I ordered were VDO5EMH vs the "F" plugs that originally came  with my engine. They are identical except they take the round vs threaded end  which should be no problem according to a local Rotax guru . The plug numbers  are the same (except for the solid tip) and as a side note the plugs are also  used on Harley's so there should never be a problem getting them.

  I should have waited to order as a member wrote me and gave me a  location to buy the "correct' plug caps for $6.30 ea. I did order one of  them to replace the one that is way below limits.

  I will replace all the caps when they arrive.

  In the meantime,I ran the engine with the new plug wires and the  mag drop is gone !! Yeaaahhh !

  I was curious as to why the 5000 ohm resistor caps are so important.  (Electrics are my weak area)

  One of the sites said: 

  

 "Resistor Covers May Be Required for Power Sport Applications When Spark  Plugs Alone Don't Provide Sufficient Noise Suppression.



Designed to  Reduce Electro Magnetic Interference and Radio Frequency Interference, Which can  Interfere with Electronic Ignition Components, Causing Misfires and Poor Engine  Performance."

  

  So there you go...that's the reason ! (learn stuff every day !)

    Again , thanks for all your help !

                                                                   Dick Maddux

                                                                   Milton,Fl

                                                                  Kitfox  4   



 [quote][b]

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Thu Jan 17, 2013 6:31 am Post subject: Re: spark plug caps for 912UL

Hi Dick,



Glad that pesky issue is behind you. I hate tracking electrical ghost.  

Time to fly.

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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