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Ace117
Posted on Sunday, August 09, 2015 - 10:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So I was reading through my 06 R1 service manual, Im getting ready to change the plugs and wanted to see which plugs to order. The service manual call for NGK CR9EK.... Well MY RX uses CR9EKB which got me thinking, So I looked up the specs for both plugs and the CR9EK plug for the R1 has the exact same specs as the plug for the RX same reach,thread size,thread pitch same heat range the only difference is the gap, .028 for the R1 as apposed to the RXs .032

So I then looked at the R1s race manual and it calls for NGK R0045Q-10 race plug, again same specs except for gap and heat range. .044 gap and heat range 10 as apposed to 9. Oh its also not a mulit-ground plug like the other 2. Could this plug be used on the RX? Im curious since they are so close to each other.











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99buellx1
Posted on Monday, August 10, 2015 - 12:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Why?

I doubt you will ever see any difference, also remember that the "race plug" is also probably expecting that you would be running highly volatile race gas with it.
And it would be a definite no for the cost difference.
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Hootowl
Posted on Monday, August 10, 2015 - 12:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Race gas is less susceptible to detonation under compression than pump gas. By some measurements, it's less volatile. Could be why they use a different plug for racing.
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Buelliedan
Posted on Monday, August 10, 2015 - 12:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I don't think it has anything to do with race gas. The "race" plug is a colder heat range which will handle detonation better in race conditions. I do not see any reason why the race spec plugs would not work great.
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Snacktoast
Posted on Monday, August 10, 2015 - 02:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Generally speaking, surface discharge plugs are used in very high compression situations. The engines that I've seen them used in had north of 15:1 static compression.
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Robertl
Posted on Monday, August 10, 2015 - 04:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Spend your money elsewhere.
Run the plug it came with. Those motors are tweaked for just about every ounce of power they have.

Unless you have completely changed the engine characteristics (compression, heads, size, cams, ignition, etc.) it is best to stay with the oem or very similar plugs.

One exception I found to be true: Platinum last longer so more consistent over its life so I always upgrade any old plugs when it is time to replace, but almost all newer multi-cyclinder engines come with these now anyway (guess I should check my mower soon).

https://www.centuryelectricmotor.com/MotorCategory .aspx?LangType=1033&id=335
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Ace117
Posted on Monday, August 10, 2015 - 11:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the input guys, I was mostly curious it the race plug could be safely used on the RX. The race manual for the R1 says that with the thinner head gasket the compression gets bumped up from 12.4:1 to 13.3.1, the compression ratio for the RX is 13.4.1 so surely they plug has to offer some sort of performance however minuscule it might be. I just wanted everyones 2cents since im not the most knowledgeable with this kind of thing. I do thank everyone for the input and not just ignoring my question.
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Snacktoast
Posted on Tuesday, August 11, 2015 - 12:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the compression ratio for the RX is 13.4.1 so surely they plug has to offer some sort of performance however minuscule it might be.

I wouldn't put any money on the plug offering a performance increase on a stock engine.
Static compression ratio, which is what is listed at 13.4:1, is only a very small piece of the equation. The running or dynamic compression ratio is significantly lower than this due to cam design, which is why it can run on pump gas without pre-ignition.
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Ace117
Posted on Tuesday, August 11, 2015 - 01:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I see so the only way this plug would give some if any performance gain would be with race cams and thinner head gasket + race fuel. Thanks for the input, the race manual for the R1 also calls for a thinner head gasket and race cams. I see the same would be required for the RX. Well at least we know there is a plug that can possibly be used on a race prepped RX.
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Skntpig
Posted on Tuesday, August 11, 2015 - 05:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

On 600s there is a measurable difference in power on the dyno when going from a stock plug to one of those thin tipped iridium plug.

The smaller electrode decreases the displaced area in the combustion chamber and essentially decreases compression = LOWER HP.

Sometimes RACE doesn't mean better or faster in a stock bike. Save your money for a Trackday.
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