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T500 500/Five - Spark Plug Wiring Orientation from Coil

Posted: Mon Jun 20, 2022 12:36 pm
by DaytonDave
I have owned my 1968 Suzuki 500/FIVE (short wheelbase) since I unpacked it from the crate in 1968 and assembled it at the dealership. The spark plug wires were always set (from the factory) to cross each other near the top of the frame before going to the plugs. In fact they could not easily be re-routed otherwise without re-threading them between the wiring harness and carb cabling and upper frame. When setting points and timing over the years many times, the setup was just like the manual indicates - nothing strange there. The bike always ran great this way (11,000+ miles) and in fact I never paid attention to that detail except I have the tank off now to re-line it and noticed it and thought it strange. Mind you, this bike is so original that it even has the factory silver foil stickers on the plug wiring! Intuitively, I would have expected the factory wiring to run from left coil to left plug and right coil to right plug. Has anyone run across something like this and does it matter? Thanks for input. :up:

Re: T500 500/Five - Spark Plug Wiring Orientation from Coil

Posted: Tue Jun 21, 2022 7:58 am
by jabcb
Typical of the twins, the coils can be installed facing forward or backward. HT leads are crossed with one direction & not with the other.
There was some variation in the orientation when Suzuki built the bikes. Plus shops/owners did whatever they did when replacing the coils.

Re: T500 500/Five - Spark Plug Wiring Orientation from Coil

Posted: Tue Jun 21, 2022 8:12 am
by DaytonDave
Thanks very much jabcb. That makes sense and clears up the mystery. I will leave it be. :clap: :up:

Re: T500 500/Five - Spark Plug Wiring Orientation from Coil

Posted: Fri Aug 19, 2022 11:27 am
by argo1974
Sadly there aren't any detailed pictures in my T500/FIVE dealer set-up manual about ignition coil area. I can clearly see forward pointed coils though. My T500 Cobra came with crossed plug wires as well.
Would love to see pics of your bike.