[Discussion] Technical - Spark Plugs

[william_liu]

Originally posted by iliew@Feb 25 2004, 11:39 PM

Hi, anyone out there know the correct spec for spark plug gap for Super4 CB400? I have a VTEC-II.

 

I know most people don't gap their own spark plugs and just install them but surely there must be a recommended gap so that we can check new plugs then later clean, check and adjust plugs. Also where is a good place to buy a gap meter?

Does the owner's manual state the proper gap?

[vinexbum]

Originally posted by iliew@Feb 26 2004, 07:13 PM

Spark plug gap refers not to the valve, but to the distance between the electrodes on the spark plug itself. For example, I have NGK CR8EH-9's in front of me. On the box diagram, step 1 tells you to check the gap and shows you exactly what the gap is.

 

Every engine (bike, car, whatever) has a spark plug gap specification for it to run optimally. When I tuned my own car when I was studying in the US, one of the things I would do is measure and set the gap before installing each spark plug. It can be done using a very cheap tool that looks like a disc with varying thickness all the way around. Usually the gap specification is in the owner's manual but I don't have the manual for my VTEC II.

 

Here is a site that shows this for a different bike but concept is the same:

Honda Ignition Timing Adjustment

Wow I am impressed. I have learned something. I personnally seen those gauge from my friends B4 but never seen anyone selling it

[HondaSuperFourHSF]

Hi all just to find out what will have if one of your spark plug gone? i mean fused. What will have to the bike? No power? cannot start at all? Anyone kanna before?

[BaMBiNo]

woa lan u come back only post ar... champion....

[tom3694]

Originally posted by HondaSuperFour(HSF)@Mar 2 2004, 02:26 AM

Hi all just to find out what will have if one of your spark plug gone? i mean fused. What will have to the bike? No power? cannot start at all? Anyone kanna before?

veri difficult to start if can aso idle like your choke is on you can hardly move off not to mention power in hokkien terms is call 'sar kang hwa' no no to the engine condition

[seven7sin]

when u installed yr own spark plug that time..u try it...u still can run..can start...no problem...onli a bit no strength..

[joekia]

Originally posted by HondaSuperFour(HSF)@Mar 2 2004, 02:26 AM

Hi all just to find out what will have if one of your spark plug gone? i mean fused. What will have to the bike? No power? cannot start at all? Anyone kanna before?

the biggest tell tale sign... ur bike sounds like a v twin bike...

[Guest m0nk]

Originally posted by HondaSuperFour(HSF)@Mar 2 2004, 03:26 AM

Hi all just to find out what will have if one of your spark plug gone? i mean fused. What will have to the bike? No power? cannot start at all? Anyone kanna before?

u will experience drop of power.

[raven77]

can start but not power like ti used to be.

[HondaSuperFourHSF]

So Here is the summary of all posts when 1 spark plug not working

 

1) No power

2) Just like choke is on

3) Can start

4) sound funny

[iliew]

Still no-one who knows the spark plug gap specification? Anyone with the CB400 manual?

[Guest aiya4]

Oh I have it but dunno put where liao... go home check

[ivant]

0.8-0.9mm

[iliew]

Great, thanks ivant -- and someone with the same name as me!

 

IvanL

[kho686]

which one is better??

Ngk iridum ro Denso??

[raven77]

depend on u loh... actually price is the only difference... both r quite good plugs.

[stylomilo]

dicussed b4!

do a search!

 

http://www.singaporebikes.com/forum/index....showtopic=34562

[hachi]

Just get the cheapest plugs denso $4-5 per plug.

[calvin_haito]

actual it don't really matter ...

you can't really feel the much different unless you change the full set

i used to use splitfire for my s4 even with the cable

yes i agree that it may increase 1 or 2 hp but not for long

 

according to my mech, the performance will not last ... you can check the plug after 3mth, the condition is like having to change a new one liao...

and it so much expensive

now change back to normal honda NGK plug liao

 

hope it help you with your decision ...

[HondaSuperFourHSF]

actually normal one will do but if you think you got the money to spend then buy more expensive one. NOT MUCH different lah...

[jovan]

wat abt splitfire?

[luvpuzzle]

me using NGK now... $6.50 per plug

[Wilson_cool]

Try before both brands Good for smaller bikes cos veri easy to kick start As for response pretty good lor One thing is it may help you to prolong the period(subjective depend on manufacturing and wear n tear) b4 your next services For me i using NGK iridium pretty good not as bad as denso and veri easy to start after prolong period of not using the bikes :cheer:

[ckevin77]

hey guys,

 

do you know which spark plug is the best to use for vtec1??? i tot of changing from NGK iridium to DENSO iridium.... or maybe use back the NGK factory fitted plug is the best????

 

i heard using iridium plug will cause the piston head to wear??? izzit true???

[Vtec1605198534]

normal one gd enuff