Hi
I’m trying to determine what the following is on my engine as I’ve had a stethoscope out to determine a light tap/knock noise on warm up. I’ve found the part,actually there are 4 of them,but the one nearest the radiator cooling fan is quite noisy. I I’ve added photo from my manual,there on the cylinder head just in front of the reed valves with an electrical connector on each,there are 4 cylindrical “plugs”
What are these and is it normal for them to be noisy on warm up?
Thanks

 

Are you referring to the spark pug tubes that the spark plug is in?

 

Ah I assumed the plugs were further back under the tank!
Is it normal to have a noisy one!?!

 

No. They only make noise if they are loose or the lead/coil is arcing to something it should not be.

 

All seems secure after checking just now,assuming if it is arcing would it not misfire under load etc?

 

Any arcing will be a misfire.

 

Ah must be ok as it runs sweet,guess I’ll just enjoy riding it then 😉
thanks for your input
Thanks