Final word on spark plugs for L28

[german240]

Around 10.7. 

[240260280]

We used to heat our snowmobile plugs with a lighter to start on cold days.

Heat is as important as spark.

Edited January 27, 2019 by 240260280

[jonbill]

Bkr7e seem the best compromise on mine.
Doesn't melt at high revs, doesn't foul at idle.
It's a 14mm hex because my plugs are 5mm further in than normal.

[Zed Head]

8 hours ago, Labubre said:

Year of purchase: BPR5ES-11 (7634). Good crank, summer/winter

Year +1: new NGK wire set + BPR6ES (7811). OK summer/winter but less good than BPR5ES-11

Year +2: new cap & rotor + BR6ES11 (3824) - NOK much harder to fire up! Need to change

Now i am interested in explanation of somebody can...

"P" signifies a projected tip plug.  The electrodes are further in to the combustion chamber.  Might be part of the problem.  

https://www.sparkplugs.co.uk/technical-glossary/