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Discussion Starter #1
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
 

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Discussion Starter #5
Ah I thought the plugs were further back under the tank lol!!
So what causes a noisy plug/coil on warm up,it’s fine once at full temp?
 

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chances are it's not the coil. but either way pull the coil and the spark plug and check it out.


move the coil from cylinder 1 to cylinder 4 and vice versa. see if the noise follows the coil. chances are it won't'.
 

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Discussion Starter #7
I’ll take a look,but it runs sweet with no issues at all to be honest
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Your pic is not a coil its a pair valve and shouldn't be making any noise at all. Doesn't matter though it won't affect the bike its just emissions related.
 
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