Can anyone advise me what plug is needed for a 300RR fitted with S3 low compression head?

A moment it has an ngk bp6 stand long reach plug, is this because of the head insert?

The correct plug I seem to keep seeing is a small short reach bpmr6a?

Any give me correct info?

TIA

Edited January 29, 20251 yr by scorpaian

 

So looking at S3 website, the pics show the neck of insert where I screw in plug a lot shorter than the one I have?

Was this a mistake? or just altered and I have an older model insert?

So basically, the normal bike should have a small short reach plug, but as my plug head insert is longer it's had to use a normal tall plug??

Only way to use standard short plug is to turn head insert down?

Local hardware store, it's a chainsaw sparkplug. Cheap and easy to source.

hi, yes I have two small plugs, that's not what I was asking bro!

Thanks for reply though. 

If the head needs a longer reach plug that should be easy to measure.

Dude, you've missed the point, forget the plugs at mo, it's the insert I'm asking about, I have two short plugs (seems correct small ones) but the one in it is a long reach, why? is my insert different or incorrectly made?

Anyone have an answer, I think Konrad seems to get it, but still not overly clear!

Apologies, opened his post to see what you are working with, strange way to do it.

I like the stock compression, not even sure why you would want to lower it, best luck with your mod.

... I would have stuck it in my lathe and shortened the collar, looks like it has a ton of thread engagement, but we can't see what you guys can with one in hand.

Edited January 29, 20251 yr by lemur

1 hour ago, scorpaian said:

Dude, you've missed the point, forget the plugs at mo, it's the insert I'm asking about, I have two short plugs (seems correct small ones) but the one in it is a long reach, why? is my insert different or incorrectly made?

Anyone have an answer, I think Konrad seems to get it, but still not overly clear!

If you click on the picture that konrad put in his reply all the information you require is in the post put up by a member using the name jer with splat shops on line shop selling the S3 head inserts.

Edited January 29, 20251 yr by Tr1AL

Dude, you've missed the point, forget the plugs at mo, it's the insert I'm asking about, I have two short plugs (seems correct small ones) but the one in it is a long reach, why? is my insert different or incorrectly made?

Anyone have an answer, I think Konrad seems to get it, but still not overly clear!

Yes I've seen the splatshop description, it's very confusing but I get it now, basically I need to buy long reach NGK BP6RES plugs!!

There is an S3 low plug type that takes the BPMR6A plug (stock plug) and fits the standard TRS head cover.

https://www.thehellteam.com/trs-cylinder-head-insert

 

 

Edited January 29, 20251 yr by arnoux

1 minute ago, arnoux said:

There is an S3 low plug type that takes the BPMR6A plug (stock plug) and fits the standard TRS head cover.

https://www.thehellteam.com/trs-cylinder-head-insert

 

 

is this lower comp?

26 minutes ago, scorpaian said:

Dude, you've missed the point, forget the plugs at mo, it's the insert I'm asking about, I have two short plugs (seems correct small ones) but the one in it is a long reach, why? is my insert different or incorrectly made?

Anyone have an answer, I think Konrad seems to get it, but still not overly clear!

S3 make two different high comp 300 inserts. One is for fitting a short BPMR6A  plug as found on RR, R and ONE models, and one that takes the BPR5ES longer plug that is fitted to the GOLD model.

3 minutes ago, scorpaian said:

is this lower comp?

NO. S3 colour code their inserts:

Yellow / Gold = Low Compression

Silver / raw aluminium finish = stock compression

Red  is always the hi Comp variant.