Spark Plug for Optimum Performance ?? - MVAgusta.net
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post #1 of 28 (permalink) Old 03-16-2014, 09:02 PM Thread Starter
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Spark Plug for Optimum Performance ??

Was reading a old thread about this from 2007. What is your opinions now? Has technology gotten any better or still use the standard plugs from the factory.

Reason for the question is I have the airbox off to clean the filter. It has been about 3-4 years since the plugs were last replaced after 1 went dead. Thinking I might just go ahead and place in new since she is apart and the weather will suck for the rest of the week. Not sure if I should replace the wires at the same time or not?
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post #2 of 28 (permalink) Old 03-16-2014, 09:32 PM
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Andrew,
Try NGK CR9EI-A plugs.
You'll need to contact your local bike shop and ask them to put aside some of the alloy seeds that screw into the top of the plug - these are not supplied with the CR9EI-A plug. I'll post up a picture when I get home.
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post #3 of 28 (permalink) Old 03-17-2014, 05:31 AM
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Randrew, I'll get you the Suzuki part number for the Iridium plugs Dave refers to....best price out there, but you do need the "seed" or screw on cap to fit the MV coil/cap.....

And you have "stick" coils don't you? No spark plug wires to worry about......

I used to be fast....now I just dream about it.
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post #4 of 28 (permalink) Old 03-17-2014, 06:49 AM
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++ on NGK Iridium, and Denso are good too. No trouble with either.
I have over 30k miles on iridium in my "other" bike.

Ed

Last edited by Gearhead; 03-17-2014 at 09:30 AM.
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post #5 of 28 (permalink) Old 03-17-2014, 08:56 AM
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Ngk iridium plugs here also. Cars and bike. Never use anything else.

Joe - mv2envy
AKA. MV Guy 12345
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post #6 of 28 (permalink) Old 03-17-2014, 02:30 PM
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Suzuki Part Number # 09482-00558

NGK CR9EIA-9 MSRP $8.27 each

Will require sourcing some screw on "seeds"/ caps to go in MV coils and plug caps.

I used to be fast....now I just dream about it.
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post #7 of 28 (permalink) Old 03-18-2014, 12:01 AM
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You can spend a bit of time and indexing the plugs. You might get an extra HP or two for the effort.

Slow is smooth and smooth is fast!!
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post #8 of 28 (permalink) Old 03-18-2014, 09:22 AM
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Quote:
Originally Posted by minime View Post
You can spend a bit of time and indexing the plugs. You might get an extra HP or two for the effort.
Better yet, run them without washers all together. The increased CR will certainly be worth more than indexing or a better plug.

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post #9 of 28 (permalink) Old 03-18-2014, 11:05 AM
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You should be able to unscrew the caps off the plugs you're removing and screw them onto the new plugs. Always nice to have new though.

Not sure I'd pull the washers on the new plugs. The washer on spark plugs is able to deform (crush washer) to a point making it a bit harder to over torque or directly damage the head when tightening and is essentially acting as a seal for the combustion chamber.

Speed is relative, but fast is fast.

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post #10 of 28 (permalink) Old 03-18-2014, 12:20 PM
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Quote:
Originally Posted by Reckler View Post
You should be able to unscrew the caps off the plugs you're removing and screw them onto the new plugs. Always nice to have new though.

Not sure I'd pull the washers on the new plugs. The washer on spark plugs is able to deform (crush washer) to a point making it a bit harder to over torque or directly damage the head when tightening and is essentially acting as a seal for the combustion chamber.

Correct on the gaskets...that's what they are, gaskets.

Some plugs come with the caps soldered in place (the original plugs on the MV for example). You can't unscrew them.
You can order Iridium plugs that have the caps soldered on, but they cost significantly more than the exact same plug from Suzuki without the cap.

I used to be fast....now I just dream about it.
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