Spark plug gen 2

[Dafeimao85]

Hi All,

Recently i heard from my local busa community recommending the CR8EIA-9 (default is CR9EIA-9).

I understand the heat range the 3rd alphanumeric

Well according to the discussion and Google, they info was the lower the 3rd number, the better it is for the engine due to less heat dissipated and hence carbon cannot form on the chamber.

However too low will means a hotter chamber and likely to cause pre-detonation and hurt the engine (petrol itself is also a cooling medium to prevent a over heated chamber which result causing spot damage on the piston usually directly on spark plug spot).

The Gen 2 busa manual did mention that it is okay for CR8, 9 or 10. So I am thinking to put in a number 8 plug but just being paranoid will it damage my busa.

Any bro here using CR8 instead of the 9? Any info sharing?

Sorry for re asking this thread. Did search a few thread starter asking about spark plug but usually is about iridium or oe type.

 

[jwcfbd]

Is your bike still stock or have you made any mods to it? Your best bet is going to be look at your current plugs and see how they look. If they're clean I don't see any reason to change them.
A google search came up with this
"Running hotter spark plugs on a Hayabusa, while potentially offering some benefits, can lead to downsides like reduced fuel economy, pre-ignition, and accelerated electrode wear. "

 

[Bumblebee]

Is your bike still stock or have you made any mods to it? Your best bet is going to be look at your current plugs and see how they look. If they're clean I don't see any reason to change them.
A google search came up with this
"Running hotter spark plugs on a Hayabusa, while potentially offering some benefits, can lead to downsides like reduced fuel economy, pre-ignition, and accelerated electrode wear. "

I agree.....

I have never messed with the spark plug heat range in any of my 4 strokes.....I did change them in my 2 strokes from time to time though....

I've found the stock (factory) heat range plugs that were in my bike work just fine even with the usual mods being done.....

 

[Dafeimao85]

Is your bike still stock or have you made any mods to it? Your best bet is going to be look at your current plugs and see how they look. If they're clean I don't see any reason to change them.
A google search came up with this
"Running hotter spark plugs on a Hayabusa, while potentially offering some benefits, can lead to downsides like reduced fuel economy, pre-ignition, and accelerated electrode wear. "

Only have a akrapovic exhaust end can, bmc air filter and the 10mm short velocity stacks.

My spark plug is black but not wet. And I recently having carbon deposit issue. Hence I was thinking should I try #8 heating value plugs...

 

[Bumblebee]

Only have a akrapovic exhaust end can, bmc air filter and the 10mm short velocity stacks.

My spark plug is black but not wet. And I recently having carbon deposit issue. Hence I was thinking should I try #8 heating value plugs...

Sounds like you need a tune more than a spark plug change......

Your AFR must be very rich.....a hotter spark plug will only do so much.......

When did you last do a spark plug change?

 

[sixpack577]

and the 8 is cooler, 10 is hotter

 

[202mphbusa]

and the 8 is cooler, 10 is hotter

I am pretty sure that is backwards
Turbo Guys like me run 10's one step cooler

 

[sixpack577]

I am pretty sure that is backwards
Turbo Guys like me run 10's one step cooler

Correct!
Dang...I just reread my post
Sorry about that

 

[sixpack577]

and the 8 is cooler, 10 is hotter

I typed that backwards
8 is hotter, 10 is colder.
smh, lol

 

[jwcfbd]

Only have a akrapovic exhaust end can, bmc air filter and the 10mm short velocity stacks.

My spark plug is black but not wet. And I recently having carbon deposit issue. Hence I was thinking should I try #8 heating value plugs...

Sounds like you need a tune more than a spark plug change......

Your AFR must be very rich.....a hotter spark plug will only do so much.......

When did you last do a spark plug change?

I agree with Bee on this one. It does sound like you're running rich. Do you have a lot soot on your tailpipe?

 

[GIXERHP]

Only have a akrapovic exhaust end can, bmc air filter and the 10mm short velocity stacks.

My spark plug is black but not wet. And I recently having carbon deposit issue. Hence I was thinking should I try #8 heating value plugs...

So no Mapping, no reflash, and the Pair valve is still installed, These are reasons the plugs look sooty

 

[Dafeimao85]

So no Mapping, no reflash, and the Pair valve is still installed, These are reasons the plugs look sooty

You are correct.

So my best choice is to remove pair valve? I am worried about my vehicle inspection. Very strict exhaust emission. Something like California.

Or should I just use #8 plug?

 

[Dafeimao85]

I agree with Bee on this one. It does sound like you're running rich. Do you have a lot soot on your tailpipe?

When cold start, can smell some petrol fumes!

 

[Bumblebee]

I think the bike needs a tune and even better a tune on a dyno to get the AFR where it needs to be.......a hotter plug won't clear up the fueling issue you are having.

I have the Pair installed in my bike still and I don't have the issues you are having.

 

[Dafeimao85]

I think the bike needs a tune and even better a tune on a dyno to get the AFR where it needs to be.......a hotter plug won't clear up the fueling issue you are having.

I have the Pair installed in my bike still and I don't have the issues you are having.

But tunning need to hack the ecu right?

A zone i dare not touch

 

[Bumblebee]

But tunning need to hack the ecu right?

A zone a dare not touch

It would need to accessed.....

In the case of the ECU not able to be accessed due to legality issues.....I suggest returning the bike back to bone stock......it doesn't take much to upset the AFR balance.

You could go with an aftermarket fuel programmer and get it dyno-tuned through that.......mine was tuned through a Bazzaz system......that system later failed but that is a rarity.

You can try a hotter plug but I suspect it won't fix the issue....

 

[GIXERHP]

You are correct.

So my best choice is to remove pair valve? I am worried about my vehicle inspection. Very strict exhaust emission. Something like California.

Or should I just use #8 plug?

Where do you live?
Removing the Pair valve will get rid of the deceleration pops

 

[Dafeimao85]

Where do you live?
Removing the Pair valve will get rid of the deceleration pops

Singapore.

I did read up and know how to remove the Pair valve. But I am worried about the emission inspection.

Hence I didn't consider removing it at all.