Spark Plugs : which ones to use 4age ?

[jos 4 age]

Dear all,
I replaced the spark plugs on my 4AGE small port. I used the same ones which were in in the engine when I bought it :
NGK BCPR6ES. Unfortunately I do not know the gap... Does anybody know this. Cannot find this data on the NGK site. Are thes NGK ok for this engine ?

I know platinum type spark plug is better, but which one to use ?
Info in the net is not so clear about this.

Jos Evers
Netherlands.

[Apolan]

The manual specifies one of the following:

Copper:
NGK BCPR6EY11
or
DENSO Q20R-U11
electrode gap is 1.1 mm.

Platinum:
NGK BCPR5EP11
or
DENSO PQ16R
electrode gap is 1.1 mm.

i use copper denso and they've worked fine. Though theese are for the stock engine. Maybe smallport uses different type. ??

[jondee86]

The plug you are using (NGK BCPR6ES) is correct for your 16V
smallport engine. Gap is 0.8mm. NGK are good plugs and I would
stay with them... I use them myself

Platinum last longer, but there is no real evidence that they offer
any performance advantage on a healthy ignition system. Better to
save your money and just replace the standard plugs every 10,000km.

Cheers... jondee86

[IBMFD3S]

and what plugs do you guys use on a large port?
thinking about these ones: NGK BKR6EIX
Good or no good?

Regards!

[jos 4 age]

Thanks a lot for your help guys !
I will stick to the ones I use now, Since I change them every year together with the oil & filter etc. ( 10.000km .
Thank you for your explanation.
jos

[SutteR]

Can someone clear the situation?
AFAIK the BKR6EIX is for the smallport engine and the BCPR6EY for the bigport, or...?

[Apolan]

The manual specifies parts for the stock motor - stock motor is large port. Therefore BCPR6EY are for largeport. If i remember correctly NGK catalog specifies the same. Don't know about smallport though.

[jondee86]

All the bigport (TVIS) engines use 1.1mm gap plugs. In the
NGK range they would be :

BCPR5EIX-11 Iridium
BCPR5EP-11 Double Platinum
BCPR5EY-11 Copper

5 is the stock heat range for everyday round town driving. For racing
you might want to go to a slightly colder 6 heat range e.g. BCPR6EY-11.
I used these for years (6's) in a bigport for all types of running, and
never had a problem.

The smallport would use 0.8mm gap NGK plugs :

BKR6EIX Iridium
BKR6EP-8 Double Platinum
BKR6E Copper

Using BKR6E in my smallport and they work fine NGK and Denso are
the factory recommended brands, and I wouldn't use anything else.

Cheers... jondee86

[SutteR]

Thanks johndee

[IBMFD3S]

thanks!