why is this plug soo expensive?? alternative plug?

[corndawg]

the plug my bike takes is a NGK r6918b-7 the cheapest ive found them local is $26 and will take atleast a week to get , why are these plugs so expensive? and is there an alternate plug that i can safely run? http://www.ufo-productions.com/Spark-Plugs/NGK-R6918B-7.html

[harryredtrike]

what does it go to?

[bobotech]

It appears that the plug has a reinforced electrode which is prone to breaking off on some Suzuki 2 stroke engines. If the electrode breaks off while the engine is running, it could grenade the whole thing or do some bad bad damage. A chunk of metal floating around in a spinning 2 cycle cylinder isn't a good thing I imagine.

[bobotech]

Looks like the RM250 takes that plug.

[corndawg]

its a 2005 rm125 f&s race bike...i know its not to a trike but the question is about the plug not the bike in general

[corndawg]

http://i34.tinypic.com/65sute.jpg
http://i38.tinypic.com/2u7q0k5.jpg