7 replies to this topic

[gazza82]

Just wondering what plugs you all use in the different engine sizes ie 850, 998, 1098, 1275 (and derivitives)

 

I think the standard is Champion N5 but I know people are using NGKs now and other variants.

 

I did run a search in FAQs but nothing and "spark plug" brings up a LOT of threads!

 

 

Edited by gazza82, 06 March 2017 - 11:12 AM.

[Ethel]

BP6ES or something around there, add an R after the P for electronic ignition. Higher number for a tuned/ higher compression engine, you might benefit going down to a 5 for a low compression small bore.

[ukcooper]

mpi for me its - NGK SPARK PLUG RESISTOR TYPE FOR TWIN POINT BPR6E

 

one thing have notice over the years is 998 have .0.8mm gap 13000 have 1mm gap some people don't seem to widen the gap on 1300 engine swop

Edited by ukcooper, 06 March 2017 - 11:29 AM.

[Dusky]

I run brisk DR15zc 's on 998 and street use 1275's.
Brisk DR14zc on our 1330 race clubman

[Guess-Works.com]

on anything standard or lightly tuned then BP6ES (points) or BPR6ES (electronic / injection) irrespective of engine size...

on really old low compression 850's then I find running a BP5ES ( hotter running plug ) can be beneficial...

 

On high compression, higher power units, go up a grade to the BP7ES/BPR7ES but ONLY if you start getting burnt electrodes..

All other concoctions, multi pole, split fires or what ever type of snake oil plugs are a waste of money, better off putting it into good quality leads. 

[Mini Manannán]

NGK over Champion any day, BPR6ES is a good solid, reliable plug.

[carbon]

Worth noting that spark plug gap will vary according to the type of coil you have fitted:

- early low current non-ballast coils best with 25 thou plug gap

- ballast coil or 'sports' coil with electronic ignition can open up to about 30 thou

 

For later coils I think gaps may be wider still, this is down to increased voltage from the coil.

[Spider]

I think the standard is Champion N5

 

 

Actually, Champion N9Y were originally specified for all engines, these were later updated by Champion, to N9YC - the C standing for Copper (though what was copper in them I'm not sure!).

 

With the use of Unleaded fuels though, often a range colder is needed.  In the NGK range usually BPR5ES or BPR6ES will suit most engines, however if it's been modified, it may take some sorting to find the correct heat range plug.