Welcome New Rider ksa!
Questions are fine and good. Good answers are better.
The Spark Plug Cap (SPC) threads into the High Tension Lead (HTL - sometimes called the High Tension Cable HTC)) wire core using a brass screw with a conventional clockwise thread. As the wire ages, or if the previous owner pulled on the HTL by the wire instead of the SPC, then the insulation around the wires core may relax allowing the copper core wire to move away from the caps brass screw. This loss of connection translates to your misfires and running issues.
The good news is, its easy to fix!
This is an example of a typical Spark Plug Cap just like yours.
That should get you back to a better place and cost you nothing. However, if you find a damaged SPC, and you decide not to use the Moto Guzzi OEM factory part, then you will need to replace the SPC on both cylinders as it is very important that they must be identical types with the same electrical characteristics.
Good Luck! Let us know how it goes.
Questions are fine and good. Good answers are better.
The Spark Plug Cap (SPC) threads into the High Tension Lead (HTL - sometimes called the High Tension Cable HTC)) wire core using a brass screw with a conventional clockwise thread. As the wire ages, or if the previous owner pulled on the HTL by the wire instead of the SPC, then the insulation around the wires core may relax allowing the copper core wire to move away from the caps brass screw. This loss of connection translates to your misfires and running issues.
The good news is, its easy to fix!
This is an example of a typical Spark Plug Cap just like yours.
- Remove spark plug cap and attached wire from the spark plug. PULL GENTLY AND SMOOTHLY ON THE THE CAP BODY, NOT THE WIRE!!! You can use a zip tip to assist you if necessary.
- Remove your electrical tape.
- With the cap free in hand, hold the High Tension Lead (HTL) (yes, the HTL is the wire) and gently rotate the CAP ASSEMBLY CLOCKWISE. The cap may turn about a half turn on the wire and **should become snug and resist turning.** If the cap SPINS ON THE WIRE IT NEEDS REPAIRED!
- REPAIR THE WIRE: If the cap spins with no resistance to rotation, unscrew it by rotating the CAP counter clockwise while holding the wire. Using a pair of sharp side wire cutting pliers (dikes), cleanly cut off 1/4" (6 mm) from the HTL.
- Using small pick (a toothpick will work fine here), fan out the copper wire strands into a 360° pattern. Do not bend them repeatedly!
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- While you have the SPC's off, examine them closely and carefully for any breaks in the insulation, as this will be a point where the spark will leave the wire & SPC and jump to the body of the engine instead of the spark plug. This is an example of what to look for.
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- Push the SPC smoothly and firmly onto the HTL (wire) and turn it clockwise until its snug. (You are turning the self threading connector into the wire - yes, it's just a little screw)
- Watch this video from 36 seconds to 1:45 seconds and you will understand.
- Firmly Seat the SPC onto the plug.
- Proceed to next SPC, check and repair if necessary.
That should get you back to a better place and cost you nothing. However, if you find a damaged SPC, and you decide not to use the Moto Guzzi OEM factory part, then you will need to replace the SPC on both cylinders as it is very important that they must be identical types with the same electrical characteristics.
Good Luck! Let us know how it goes.
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