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Motorized Bicycle Aftermarket Spark Plugs

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  #1  
Old 08-21-2009, 02:23 PM
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Default Motorized Bicycle Aftermarket Spark Plugs

OK, so I've done some research on spark plugs and have listed every brand from around the world that has a plug for these 2 stroke bike engine kits. My goal is to make a list that anyone can use no matter where they live. Feel free to add any other plugs that have the physical dimensions of 14mm diameter with 1.25 Threads Per mm and 1/2" reach ( 12mm and .472" reach is acceptable). Heat range and resistance can vary but the physical dimensions should remain within above specs.

Spark Plug:
Accel - 0453
AC Delco - R44F
Autolite - 4123, 425, 275, 4093, XS4093
Beru - 14R-7BU
Bosch - WR6BC+, WR7BC+
Champion - L82YC, RL82YC, L86C
Daytona Maxfire - 61490
Denso - W20FPR-U, IWF20
E3 - E3.32
Eyquem - 775SX
Motorcraft - AER32
NGK - B6HS, B7HS, BP6HS, BP7HS, BPR6HS, BPR7HS, BPR6HIX, BPR7HIX
SplitFire - SF265F, SF412C <--- both discontinued - Shucks!!
Torch - E6TC, E6RTC

Also, for those of you who are looking for a "shorty" plug for a tight fitting engine, I managed to find some 3/8" reach plugs that will fit just fine in the stock heads that came with 1/2" reach plugs.

Autolite - 2974, XST2974, 254, XST254 ( The 254 has a solid terminal bud that won't work with the stock cap, if this is a problem, use the 2974 which has a threaded terminal bud. )
NGK - BM7

I've attached a picture of the stock Chinese plug that came with my engine. The picture shows a clear cross reference to a NGK BP7HS. I really learned a lot about spark plug companies while making the list. I haven't heard of some of them until now.

DISCLAIMER: Not responsible for any damages. Double check my info before buying and make sure that the new plug matches up with the stock plug that came with your engine unless you're using "shorty" plugs. Have fun and ride safe.
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Learn About Spark Plugs

Last edited by Down_South; 07-05-2010 at 10:13 PM.
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  #2  
Old 08-21-2009, 02:55 PM
TheE TheE is offline
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Default re: Motorized Bicycle Aftermarket Spark Plugs

Champion L86C works well in my 49cc engine.
  #3  
Old 08-21-2009, 03:00 PM
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Default re: Motorized Bicycle Aftermarket Spark Plugs

OK, it checks out, I'll add it to the list. Thanks
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Old 08-21-2009, 06:01 PM
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Default re: Motorized Bicycle Aftermarket Spark Plugs

Quote:
Originally Posted by TheE View Post
Champion L86C works well in my 49cc engine.
Guess you haven't heard the old saying, "Pistons, the breakfast of Champions!"
  #5  
Old 02-27-2010, 07:11 PM
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Default re: Motorized Bicycle Aftermarket Spark Plugs

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Originally Posted by Kevlarr View Post
Guess you haven't heard the old saying, "Pistons, the breakfast of Champions!"
Yep, I have a John Deere tractor that uses the Champion 71 (RC12YC) plug and I switched over to the Autolite 3924. I like to get out the DMM/DVOM/Ohm meter and check plug resistance. The Champion 71 measured in at 15.1K and the Autolite 3924 measured in at 4.82K, so I use the Autolite. Too much resistance can fry the ignition coil.
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  #6  
Old 02-27-2010, 08:17 PM
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Default re: Motorized Bicycle Aftermarket Spark Plugs

I got a Denso Iridium IWF20 on my 50cc Starfire GEN IIA. The bike starts with 2 pedal kick.
  #7  
Old 02-28-2010, 12:47 PM
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Default re: Motorized Bicycle Aftermarket Spark Plugs

Quote:
Originally Posted by Kevron99 View Post
I got a Denso Iridium IWF20 on my 50cc Starfire GEN IIA. The bike starts with 2 pedal kick.
Yep, That's a really nice plug too! Haven't tried it yet, but I've tried the Iridium IX and the Autolite XS4093 and the engine runs smooth as butter.
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