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Plug Size Sy175

mik60ish
in Scorpa

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Does anyone know what size the thread is of the plug SY175, as the bike wouldn't start, 1st time this has happened decided to try the plug from my grandaughter' Z50 which is also the same size 16mm socket. The bike fired up OK then

But on reffiting the plug to Z50 nearly cross threaded, so need a tap to clean the thread I believe its a 1/2"x 26 threads per inch?

I will have to get a spare plug, do I have to stick to the CR7 HSA as we are just coming into winter here in NZ. I thought the plug on my TL125 was bad enough but the Yamaha one is smaller still

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