Why 04 Aero VT750 Takes 4 Spark Plugs ?

Question

Can anyone tell me why my ’04 Aero vt750 takes 4 spark plugs ? I thought two cylinder heads, two spark plugs.

Gregory 6 years 25 Answers 2383 views 0

Answers ( 25 )

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    4 one on each side

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    That dates back to first conception. My first Shadow was an 83 Vt500c and she had 4 spark plugs (2 per cylinder) Im guessing it’s performance and economy reasons.

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    “Twin spark” provides uniform combustion to improve performance and lowering emissions and consumption.

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    This makes perfect sense now. Back to the bike shop to buy another two plugs ?

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      My local AutoZone had the stock plugs on the shelf. Might be cheaper that way.

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      make sure you run NGK’s…
      PS.. and you just realized this when you went to change them ?? lol

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    I stand to be corrected but the second plug burns any unburnt fuel before emission, hence the “Twin spark”.

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    Dual spark system.

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    One plug fires slightly after and burns unspent fuel. More power better mileage.

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      Hmm didn’t think this was possible tho,,seeing how it the same coil with 2 wires, wouldn’t you need a 2nd coil running off if a different pickup sensor for delayed timing on spark vs the one with accurate timing? ??

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    There are several cars made this way as well. Its not weird.

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    It’s a great design and nice that it comes “stock” on the Hondas. Back in the ’80s we spent big bucks to have that second plug installed on the old air-head BMWs. It was an expensive and popular performance upgrade.

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    Part of the combustion chamber is shrouded by the valves, a second plug ensures a complete burn.

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    Love my v-twin 4 plug aero!

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    Because the Japanese know how to make good stuff.

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    Poop

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    One for intake and one for exhaust side of head helps with power and cleaner burning exhaust same as ford ranger.

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    Emmissions. Better burn of fuel with two plugs per cylinder.

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    Our V8 Mercedes has 16 spark plugs, probably the same reason.

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    I was to by a motorcycle mechanic the reasoning for 4 plugs is that the pistons are somewhat tapered, and in order for it to get good compression you need 2 plugs per side.

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    Pistons are never tapered. Compression has nothing to do with number of plugs.

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    it helps with combustion of all the fuel.

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    My old 1984 Nissan truck had 8 plugs on a 4 cyl. I asked a seller on ebay why he gave 4 compression rates. He thought the engine had 4 pistons, funny as all 4 readings were different.

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    10 years I had my shadow only ever changed 3 till me and big brother found the 4th hiding under the tank ….

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    The 2nd plug on each cylinder is to burn excess gas for cleaner emissions and less fuel waste.
    Its same concept for cars.

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