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Help on which spark plug for a red 202

I'm servicing my recently purchased HR with a red 202 (QL code block) so figured I'd just replace the spark plugs as part of that and thought it should be as easy as taking out a spark plug then buying another set of the same.

The existing plugs have carbon build up on the thread. They are NGK-BP5EFS.

I just would have thought only the head should extend into the combustion chamber and not the thread or am I wrong?

I have a set of spare NGK-BP5FS and with one lined up against the one I pulled from the engine I can see the thread is exactly shorter by the amount of carbon on the old one like in the pic.

I've also read depending on the exact head used, either BP5ES or BP5FS could be used. Not sure of the difference with the BP5EFS that I pulled from the engine.

Based on the carbon on the thread of the plug I pulled I'd guess the new BP5FS I already have would be right.

Can anyone help confirm if I'm right or if I'm wrong what plug I should be using or how to figure that out.

Cheers!

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Comments

AC45T were original spec for HX/HZ red 202- A cross ref to this plug with others can be found here http://www.sparkplug...
An NGK BP4FS is equivalent. The reach on a 4FS = 10.9mm which is the same as the BP5FS...the 5 is a slightly cooler heat range than the 4 and would correspond to the 44T spec of the earlier non emission engines - cross ref to the BP5FS. So those plugs you have selected should be fine. And yes if the plug extends too far it can result in increased carbon fouling.

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Andrew

Thanks Andrew. Will move on with what I’ve got.

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SteveC

If I find my spark plug cleaner I will show you how to make a good easy cleaner if you have a bench grinder and an old [or new] hacksaw blade.

Bear with me I'm crook [flu]and trying to sell a house and dealing with some police matters which is taking up all my time.

When I bought my 1 year old UC Torana 173 it had the AC plugs that were recessed back in so I bought plugs that weren't recessed and thing ran miles better. Yes miles better.

I am also a massive fan of platinum plugs especially if you have improved the ignition.[I will note not many people are fans of them]

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Disclaimer :- The above is purely speculation and is only posted for entertainment purposes!!!

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