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can anyone tell me why two thunderbolt plugs which are new will not work but starts okay when i put the old ones back indo they need any treatment before they are used fill your boots cracedup

[The Jester]

This might sound daft, but is the gap in the plug correct, if they are the right plugs, you should at least get some life out of them.

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crackedup

thanks for your effort but thunderbolt plugs dont have any gap as they come is how they go in

[kingcod deano]

Might be wrong plug there should be numbers and letters on the old plugs so you can get matching ones

[Kev1n]

Gloplugs? Have you tried them out of the engine to see if they heat up?

[Ankle-Biter]

thanks for your effort but thunderbolt plugs dont have any gap as they come is how they go in

Are those the plugs in merc outboards that have a center pin and the electrode?


If it is I had the same problem and I never found out why. I put some ordinary plugs in and the engine worked a treat.

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crackedup

hi no i am afraid icant do as you suggest as it is a manual start but a good suggestion