I looked into the OS web site; not the American distributor's site, but the original, English language, Japanese web site.

Please look [link=http://www.os-engines.co.jp/english/line_up/plug/pluindex.htm]here[/link] to see which OS glow-plug, OS recommends that you use in your OS engine.


This is for all that recommend running 'F' plugs in big two-strokes, or the A3 in the .91FX.
Also, to all those shops 'giving away' A3 plugs to buyers of all two-stroke engines...


The A3 is recommended ONLY for two-stroke engines smaller than .32 cid; and for LA engines up-to-.40.

The #8 is quite universal, being medium heat.

For the .61-.91FX, .65LA, 1.40, 1.60, BGX, Etc., the right glow-plug is the cold A5; not the hot A3.

And, BTW, have you ever seen any A5 glow plug offered for sale in your LHS, for use in your new, large displacement, expensive OS engine?

I sure have not...


What would you say about this, Bax?