RE: Spark Plugs
No Problem,
The Ultimate Nitro Engine Guide is the bible of this sport man, it answers ALL question you have regarding the engine/clutch/linkages...... After reading it general engine maintainance and tuning is a breeze. It initialy says you cant tune your engine properly unless you know what going on inside it, knowing what happening on theother side of the needles when you turn them etc.... And I must say afer reading it I whole heartidly agree.......
[link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFMW8&P=7]Link to book[/link]