Started a spare parts list

[Blueadventures]

  On 23/05/2024 at 6:19 AM, skippydiesel said:

FYI 

 

BMW Bing choke return spring about $7.50 each.

Not sure of the Rotax Bing choke return spring cost but $23.85 delivered (express post)

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What occurred? Rusted through or lost the original.  May pay to get 2 or 3 depending on the condition of the spring on the other carby.

[skippydiesel]

Near new engine - did a Mandatory SB on carburettors. Had a bag for L/R carby parts. Dont know how? Dont know when? One choke return spring went AWOL. New spring on way - Back in the air very soon😈

[Blueadventures]

  On 23/05/2024 at 7:48 AM, skippydiesel said:

Near new engine - did a Mandatory SB on carburettors. Had a bag for L/R carby parts. Dont know how? Dont know when? One choke return spring went AWOL. New spring on way - Back in the air very soon😈

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OK, your Zephur should be flying soon; RAA are currently processing it.  

[Area-51]

Earlier springs were zinc plated and rusted out over time. Latest Rotax choke and throttle springs are stainless. Throttle arms should be upgraded to those with integrated nylon spring retention bush to prevent failure.

[skippydiesel]

  On 23/05/2024 at 11:19 PM, Area-51 said:

Earlier springs were zinc plated and rusted out over time. Latest Rotax choke and throttle springs are stainless. Throttle arms should be upgraded to those with integrated nylon spring retention bush to prevent failure.

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Not the throttle spring - choke return spring - PN 938286 (no nylon/plastic inserts)

[skippydiesel]

  On 23/05/2024 at 8:31 AM, Blueadventures said:

OK, your Zephur should be flying soon; RAA are currently processing it.  

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Yeah! Thanks for that. Had heard - even seen some photos - looks great

[BrendAn]

  On 24/05/2024 at 12:09 AM, skippydiesel said:

Yeah! Thanks for that. Had heard - even seen some photos - looks great

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Is it a mk 3 with twin Su,s

[skippydiesel]

  On 24/05/2024 at 1:50 AM, BrendAn said:

Is it a mk 3 with twin Su,s

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Obviously a mature Ford lover😈

[skippydiesel]

Of possible interest:

https://www.silent-hektik.de/UL_R_912.htm

 

[skippydiesel]

MG Chemicals  Heat Transfer Compound Silicon - substitute for  Wacker P12 Paste as recommended by Rotax for use on spark plug thread.

 

Almost impossible to find Wacker in Australia (at a reasonable price).

 

MG Chemicals  Heat Transfer Compound Silicon comes highly recommended by Rotax Owners Forum technician and is available in AU. https://www.rotax-owner.com/en/912-914-technical-questions/9293-is-this-spark-plug-thermal-paste-ok?start=15 Page 4

 

Best price I have found, $27.53,  is from CLC Tech Australia https://clctech.com.au/mg-chemicals-heat-transfer-compound-silicone-150g.html

[danny_galaga]

I just went to Jaycar 

[skippydiesel]

  On 01/06/2024 at 9:24 PM, danny_galaga said:

I just went to Jaycar 

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Yeah! but what product ?? and does it meet Rotax specifications ??

 

Lots of heat sink  paste products out there but only a few suitable for spark plug to aluminum head, heat & electrical conductivity. 

Edited June 1, 2024 by skippydiesel

[danny_galaga]

Who knows? It has silver in it, conducts heat and electricity. Just like in heatsinks, it doesn't conduct heat nearly as well as metal to metal, but it does conduct way better than air. You are only filling in the tiny air gaps that appear between the threads. Much of the heat, and probably all of the electrical current is being conducted metal to metal. 

[facthunter]

An anti seize is a must. and plug correctly torqued. That crushes the washer properly. Could be too hot for silicone. No one ever mentions Hot and cold plugs which surprises me. Nev

[skippydiesel]

  On 02/06/2024 at 5:33 AM, facthunter said:

An anti seize is a must. and plug correctly torqued. That crushes the washer properly. Could be too hot for silicone. No one ever mentions Hot and cold plugs which surprises me. Nev

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Rotax specifically warn against anti seize for spark plugs.

Rotax recommended product is a heatsink paste, Wacker P12 Paste. Difficult to find in Au - hense my suggestion of MG Chemicals  Heat Transfer Compound Silicon.

[spacesailor]

Unlike me .

They all use what is specified. 

Have you seen the size of those ' Old ' VW spark plugs .

I will try anything to save a " gram " or two .

Plus the " original " plugs are no longer manufactured. 

spacesailor

 

[skippydiesel]

  On 01/06/2024 at 4:44 AM, skippydiesel said:

MG Chemicals  Heat Transfer Compound Silicon - substitute for  Wacker P12 Paste as recommended by Rotax for use on spark plug thread.

 

Almost impossible to find Wacker in Australia (at a reasonable price).

 

MG Chemicals  Heat Transfer Compound Silicon comes highly recommended by Rotax Owners Forum technician and is available in AU. https://www.rotax-owner.com/en/912-914-technical-questions/9293-is-this-spark-plug-thermal-paste-ok?start=15 Page 4

 

Best price I have found, $27.53,  is from CLC Tech Australia https://clctech.com.au/mg-chemicals-heat-transfer-compound-silicone-150g.html

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Sorry Folks! - CLC Tech claim that the price above is an old one, that they will not honour. 

 

Next best price seems to be Mektronic $65.15 (delivered AU) https://mektronics.com.au/products/mg-chemicals-heat-transfer-compound-silicone-150g

[danny_galaga]

Damn, big jump in price 😲

[skippydiesel]

  On 05/06/2024 at 12:40 AM, danny_galaga said:

Damn, big jump in price 😲

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Yeah! 

The good things about this product;

Available in AU

Highly recommended by Rotax Owner Forum technical expert

One tube will likly last an owner maintainer, the whole life of the engine (very little used per plug & usually only one application/new plug every 200 hrs)

Cheaper than Rotax recommended Wacker P12 Paste (if you can find it)

Down side;

Price

May deteriorate with age ?? - Need to find a way to seal tube between uses.

[spacesailor]

Use it for your plugs , then onsale it at half price to

' mates ' .

How many plugs per tube are expected to treated ,

  ( at a smear per plug ) .

spacesailor

[facthunter]

I'd just use Anti seize. I don't know how silicone takes the possible heat. The main thing is to look after the alloy thread in the head.. A helicoil is not a suitable repair. for spark plug threads.  Nev

[skippydiesel]

  On 06/06/2024 at 5:47 AM, facthunter said:

I'd just use Anti seize. I don't know how silicone takes the possible heat. The main thing is to look after the alloy thread in the head.. A helicoil is not a suitable repair. for spark plug threads.  Nev

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I can not make an informed comment, other than to say when it comes to Rotax product recommendations, I go by their advice, whenever possible.

In this case (heat sink compound for spark plugs) Rotax advise Wacker P12 Paste - very difficult to find in Au. Rotax Owners Forum technician Roger Lee, has suggested MG Chemicals  Heat Transfer Compound Silicon as an appropriate substitute, that he has used to good effect for 23 years.

https://www.rotax-owner.com/en/912-914-technical-questions/9293-is-this-spark-plug-thermal-paste-ok?start=15

[facthunter]

A properly tensioned spark plug will allow adequate heat transfer. The area of a plug exposed to flame is not large with a 14 mm plug. even better with smaller ones. The point is that it's consistent and if the plug exhibited an overheat of the insulator, internally. (The ONLY bit that matters) you would adjust to a cooler heat range. Nev

Edited June 6, 2024 by facthunter
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[Red]

  On 06/06/2024 at 5:47 AM, facthunter said:

I'd just use Anti seize. I don't know how silicone takes the possible heat. The main thing is to look after the alloy thread in the head.. A helicoil is not a suitable repair. for spark plug threads.  Nev

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The whole point (according to Rotax) is for heat transfer purposes.

 

[facthunter]

Read what I just posted above.  Nev