josseaux asked this question on 5/10/2000:
bonjour i am in saudi arabia and i own a 20 feet day cruiser motorised whith a 150 hp mercury black max v6 mod 1984 .because nobody know any thing seriously about mechanic i can not have any answer for theses questions: what kind of spark plug may i use depending if i use it for trolling or hight speed (temperature of spark plug is different in this cas) if you give me a number for ngk,is it possible to give me also in different brand like champion,ac or yamaha because they don't have any table of correspondance. other question: when i start and when i use it for trolling the engine smoke a lot and produce a huge vibration,i use only 2% oil and when i stop trolling to increase speed it need time to run with 6 cylinder.the carburator jets are the basic 0.98.allways during acceleration from zero to full trottle there is a hole during 1 to 2 second and after it run very well. im sorry for my poor english and i hope somebody will understand my problems in advance i thank you a lot.
cartoonboy13 gave this response on 5/12/2000:
if your using a trolling motor it would probaly be a small spark plug and depending what kind of motor you have. cartoonboy13
The average rating for this answer is 2.8.
josseaux rated this answer a 3.
thanks to try to help me of course it will depend of the kind of engine ,it's for that i give the exact type in my question.we don't have any original bookshop for this brand. now,what is a small spark plug ? for me i know long or short thread,hot or cold spark plug depending of the lenght of the isolator around the central electrode.depending of the temper. you can use it for trolling or hi speed. if you try to use a cold one for trolling you will kill the sp. plug and the engine will work rought. if you use a hot kind for hight ,you can kill the engine(hole in the piston dome).of course a sp. plug can be hot for a type of engine and cold for an other one.it's for that we must specify the brand and type of each engine,as i do it in my question. but whatever thanks for your answer and congratulation for you interrest in boating (for your age) .sorry for my poor english but as you know mabe,as a french i can't like this wild langage coming over the chanel(uk)by.