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North UK

Front = Rich , or ignition coil or ignition cap is wanning.
Rear = Rear cylinder jet may be blocked in full throttle , or slide NEEDLE is on lean setting or , plug is wanning

Clean the spiral threads of the plugs , or get new ones CR8E stock, then go for a little short test , take them out.
= If the plug threads are wet with oil, there could be an internal head leak to do with gaskets or valve seals
= If the plug threads are dry BUT ….all threads are dark = bike is overheating a tiny bit

The threads should be totally dry leaving on about 3-4 lines of thread dark , this would be acceptable and normal.

Hope this helps, will check your email shortly as i did get it but i was away for a day , my apologies!

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