spark plugs for old bikes

canuk eh

canuk eh

New Member
i got a '75 cb200t, and im wondering what's the best direction to go when it comes to spark plugs. i'm rinning nkg-r plugs now, but i would like to have an idea of what the advantages of platinum/iridium/copper would be? as far as far as hoe they will last, i dont care at all, i plan on changing them every year(whats 50 bucks a year on love at first sight?).
 
Ordinary plugs work just fine. Iridium plugs were invented so that car makers could claim that their cars can go 100,000 miles without a tuneup. You will see no reliability or performance improvement by using expensive spark plugs. Use that extra $45 to buy gas and ride or get a lap dance. <G>
 
If your gonna change them once a year anyway don't waste the money.

Hell normal plugs are good for 25k miles, which I doubt 80 percent the bikes on this forum have seen in their life time.;)
 
Just go with regular ngk's. Iridium plugs were designed for cars that have coils that can put out 100kv's so they will do nothing in junction with your coils.
 
right on guys, thats what i thought i just wondered if they made any real short term difference. now i have read about changing the gap(making it smaller) to increase the heat in the spark(less gap=less resistance and more amps) or side gaping the plug for mor surface area on the spark. is there anything to back these claims, or are these guys just full of shit?
 
I don't think it really matters. The plugs going to have the same heat range however its gapped, and the factory has the best setting for plug gap.
 
Small gap needs less voltage to jump that gap and is the fix for weak ignitions - sometimes. The other approach is bigger gap so that the voltage has to rise higher before it can jump and so it will tend to make a fatter spark - IF the ignition can handle it.

Iridium plugs are great in high compression motors with weak or marginal ignitions and tend to fire more consistently than regular fat wire plugs - IF the engine needs them. If the ignition is OK and the motor is running fine, a fatter spark will make zero difference. If the fire is lit, it's lit!

Heat range and plug temps are a whole other matter. It's not uncommon for people to talk about a fatter spark or a hotter spark, but it makes no difference to the actual temperature of the plug or it's heat range. It's just an expression.
 
awesome guys, thanks for the replies! i'm pretty new to the game, so any advice on any matter is greatly appreciated.
 
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