[Discussion] Technical - Spark Plugs

[KHUNDAN]

Can someone tell me what the spark plug gap should be set at?. I have a 1993 Honda CB 400 Super Four. NGK plugs CR8EH-9

 

Also what plugs do you use?: :help

[KHUNDAN]

What should the gap be set at? And is there a better plug than the NGK CR8EH-9 for the Super Four?

[sino74]

Originally posted by KHUNDAN@Jun 24 2006, 11:04 PM

What should the gap be set at? And is there a better plug than the NGK CR8EH-9 for the Super Four?

Juz dont adjust e gap setting if ur using for normal road condition...use as it is cos its ord been set from e factory.Besides NGK, u can choose to use DENSO.I guess theres a few more brand in e market....

[KHUNDAN]

Thanks sino74, Out of 3 forums I am subscribed to you are the only person that gave me any advice. The thread was read by many on all 3 forums but no one said anything. Again thanks for the feedback.

 

KHUNDAN

[sportster77]

Originally posted by KHUNDAN@Jun 24 2006, 11:04 PM

What should the gap be set at? And is there a better plug than the NGK CR8EH-9 for the Super Four?

Hi,

 

this plug CR8EH-9 has a pre set plug gap of 0.9mm for your paticular model.

This pre setting is good enough as someone has mentioned. A better one would

be CR8EHVX-9 platinum plug.

[KHUNDAN]

Thanks alot for the input. This is what I needed to know.

 

Off wall question? What is the normal km's to a tank of petrol on these CB400SF's driving normal? Getting ready to do a long run and was just wondering..

[ahlexsgbikes]

my vtec 1 can go up to 340km (safe side) with KNN air filter... i had original and dirty filter and only able to go up to 280km...

[sportster77]

Originally posted by KHUNDAN@Jun 25 2006, 05:50 PM

Thanks alot for the input. This is what I needed to know.

 

Off wall question? What is the normal km's to a tank of petrol on these CB400SF's driving normal? Getting ready to do a long run and was just wondering..

I'm not sure about petrol mileage as i'm not riding CB400SF but our spark plug

is the same. Use high octane petrol for long distance to help protect engine and improve mileage.

[FZ06]

Dear bros juz curious... will iridium plugs really have any better effects on S4 especially in pick-up and so on...or will prolonged usage of iridium plugs cause any ill effects for S4 due to the "higher/greater spark" on the pistons...

[ANR Impex]

No ill effects, but super4 may not get the maximum benefit out of iridium. The main advantage is not just the smaller spark tip, but the excellent longevity of the iridium tip. Super4 plugs typically last very well. Iridium will benefit high revving sportbikes more as many have plugs worn out of spec in 10~12k. It also depends on how you ride your bike. If you high rev your super4, it is worth a try.

 

Motoworld has launched a series of iridium plugs, it is alittle more affordable then the densos. I just saw it yesterday, think they have some promo going on with it.

[stsoh]

A common misconception is that changing spark plugs will result in a large power increase. In most cases, removing even seriously worn out spark plugs will only result in very modest power gains, typically about 1-2% of total engine output.

 

Spark Plug Basics:

The spark plug has two primary functions:

To ignite the air/fuel mixture.

To remove heat from the combustion chamber.

 

Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200°F higher melting point than platinum and conducts electricity better.

[carbine]

the only diff i noticed abt iridium spark plugs is the bike is easier to start...

[luvpuzzle]

i do feel better pick up and smoother throttle response

[Dscheng]

Originally posted by luvpuzzle@Jun 29 2006, 11:09 PM

i do feel better pick up and smoother throttle response

Keke, me too..

[ANR Impex]

When you change new plugs, regardless of what grade, you'll always feel slight improvement in response. The iridium, hopefully with its longevity, will maintain this improvement for a longer period.

[WingZer0]

thinks its an overkill on an S4......like bro ANR Impex mentioned b4 unless u using high performance sportsbikes like Suzuki K1-6, CBR1000s or R1s then u can feel the diff.....but on a road bike....better save $$ and get normal plugs will do.

[luvpuzzle]

Originally posted by ANR Impex@Jun 30 2006, 01:55 AM

When you change new plugs, regardless of what grade, you'll always feel slight improvement in response. The iridium, hopefully with its longevity, will maintain this improvement for a longer period.

ya i understand that but smooth response laz for very long

anyway it was K&T who recommended me to try the iridium plugs, and after using i like the feel so continue using lor..

no hard n fast rule de la

up to the indv likings

[Panther]

Originally posted by stsoh@Jun 29 2006, 05:46 PM

A common misconception is that changing spark plugs will result in a large power increase. In most cases, removing even seriously worn out spark plugs will only result in very modest power gains, typically about 1-2% of total engine output.

 

Spark Plug Basics:

The spark plug has two primary functions:

To ignite the air/fuel mixture.

To remove heat from the combustion chamber.

 

Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200°F higher melting point than platinum and conducts electricity better.

So basically what you are saying here is that iridium plugs are better than usual due to their properties, but that one should not change to it until one has totally worn out one's spark plug, or when it becomes totally necessary? Because your point(s) seems to be pretty vague here.

[FZ06]

thankx for all the replies...So can i safely say that iridium plugs won't harm our S4 in the long run and also its worth a try...

[Gaofar]

Yup! Definitely worth the buy! Been using NGK Iridium spark plugs for 4yrs plus and even with my new VTEC III Bol'Dor, I also installed Iridium plugs after my new bike completed it's ran-in.....

 

Hee hee hee!...... :cheeky:

 

 

 

Gaofar p(^.^)q

[FZ06]

Is it true that there are imitation iridium plugs in the market nowadays?? and which brand for iridium is better?? Denso or Ngk or...?

[skateboy]

changing of iridium plugs, no prob... they claim to have a longer lifespan, more precise firing therefore save petrol. due to the small surface of firing compared to normal plugs...

[FZ06]

so denso or ngk iridium better???

[pufferfish_76]

hi all ... im now use the new type of iridium plug .. $22 each ..

 

been use it for 2mth le ..

 

good pick up at gear 3-6 .. gear 1n 2 not much diff

 

the plug is from germany .. donno what the name of it ..

 

will up date u all on monday ...

[skateboy]

Originally posted by FZ06@Jul 1 2006, 09:24 PM

so denso or ngk iridium better???

depends on individual... i personally like denso...