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T500 500/Five - Spark Plug Wiring Orientation from Coil
Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan
- DaytonDave
- On the street
- Posts: 18
- Joined: Fri Jun 03, 2022 1:37 pm
- Country: USA
- Suzuki 2-Strokes: 1968 T500
- Location: Dayton, Maryland
T500 500/Five - Spark Plug Wiring Orientation from Coil
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 :up:](./images/smilies/icon_thumbup.gif)
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- jabcb
- Moto GP
- Posts: 4241
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: T500 500/Five - Spark Plug Wiring Orientation from Coil
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.
There was some variation in the orientation when Suzuki built the bikes. Plus shops/owners did whatever they did when replacing the coils.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
- DaytonDave
- On the street
- Posts: 18
- Joined: Fri Jun 03, 2022 1:37 pm
- Country: USA
- Suzuki 2-Strokes: 1968 T500
- Location: Dayton, Maryland
Re: T500 500/Five - Spark Plug Wiring Orientation from Coil
Thanks very much jabcb. That makes sense and clears up the mystery. I will leave it be.
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- To the on ramp
- Posts: 205
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- Location: Tallinn, ESTONIA
Re: T500 500/Five - Spark Plug Wiring Orientation from Coil
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.
Would love to see pics of your bike.
1x T500 Cobra (1968)
4x T500K (1973)
4x T500K (1973)