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RL86C Repalcement


dave237's Avatar
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10-11-05, 10:39 PM   #1  
RL86C Repalcement

Cheese,

Can you recommend a replacement plug for the (Champion RL86C) plug in my 12hp Tech?

It seems to be to hot for my applictaion "heavey load". Is there a cooler plug that you know of, I can switch to.

God Bless,
Dave237

 
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cheese's Avatar
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10-13-05, 01:15 AM   #2  
I generally use an RC12Yc in most all American OHV engines with good results.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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10-13-05, 02:52 AM   #3  
If you want to stick with the "L" series plug (and I recommend you do, since you apparently have an older Tecumseh), I'd use a RL82C or L82C, with the first being a resistor plug.

 
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10-13-05, 10:15 AM   #4  
Thank you both. I appreciate it. I'll give em both a try and see which one works the best.

God Bless,
Dave237

 
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10-14-05, 12:59 AM   #5  
I was wondering what kind of plug you had in that thing. I guess if it's quite old, I wouldn't know what plug it takes. About the only old tecumsehs I see around my area are 6 horse horizontals bolted to tillers.


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10-14-05, 02:17 AM   #6  
Cheese,

It's an OVM 120/ 1988 model. It's one I honed the cylinder in a while back (thanks for your and Puey's advice by the way). It calls for a RL86C.

I'm currently running a (crossed Ref. Autolite 425), their numbers are a bit confusing, but after doing some study on plug types it seems to be a very hot plug for such a very hot engine. Even with valves adjusted it is very hard starting after some heavy mowing. Once it cools (5 minutes) it fires up fine.

I thought I would try a cooler plug and see if it made a difference. Maybe it would dissipate some heat. I use this engine to mow some very tall and tough grass. I'm going to give both Champion "RC12YC" and "RL82C" a try this week end for the last mowing this year. I have a Champion and Auto Lite cross reference guide however, it does not list which plugs they do manufacture.

I have noted that the "C" series has a 3/4" reach to where the "L" series has a 1/2" or .472 reach. I will test before useing. I'll let you know the out come.

Thanks again and God Bless,
Dave237

 
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10-14-05, 02:50 PM   #7  
Do not use the RC12YC as it will contact the piston and both the plug and piston will likely be toasted. The reach of the RC is too long!!!

 
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10-14-05, 03:53 PM   #8  
deanw
puey61 is correct. Here are the plug specs:

RL86C
Thread 14mm
Hex size 0.8125
Reach 0.5000


RC12YC
Thread 14mm
hex size 0.6250
reach 0.7500

Here are some other plugs you can use which cross reference to the RL86C:

NGK B6HS , AC Delco 46F , Accel 156 , Motorcraft AES4C
Denso W20FS-U , Bosch W8AC , Autolite 425

 
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10-15-05, 01:37 AM   #9  
Yes...do NOT use the plug I mentioned. You don't want a hole in the piston. My goof!

I should have checked a bit further before reccomending a plug. When I think OHV, it usually means rc12yc, but not in this case. Sorry! I know exactly what engine you're talking about now, and should have known the plug differences even though I don't know the # off the top of my head.

I need some ketchup to go with this crow, lol!


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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10-15-05, 09:26 AM   #10  
Thanks for all the info guy's.

Cheese, no problem. Yes, I did note that the reach was a 1/4" longer and checked it in the hole before running. I turned the crank slowly by hand and it did indeed touch the piston. No harm done.

The only cooler Champion plug I can locate is the RL82C that Puey recommend however, I would like to find an even cooler plug like the RC12, RJ17 or RJ19 but in the "L" series 1/2" reach, if one is manufactured?

I'll look over the options an see what I can find. Thanks again to all for your help!

God Bless,
Dave237


Last edited by dave237; 10-15-05 at 06:21 PM.
 
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10-16-05, 09:20 AM   #11  
The coolest L-series you'll find is an L78. Are you running race fuel in this thing? If not, there's no need to go any cooler!

 
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10-17-05, 11:42 AM   #12  
Thanks for info Puey. Nope, not running high octane...LOL. Just trying different plugs. I got to add to the old spark plug collection.

God Bless,
Dave237

 
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