got my ty running great, only problem after about 2 hours use it starts missfiring then stops, no spark, change the plug and off it goes again no problem for about another 2 hours, iv got the mix right by the colour of the plug, its just had a rebore and crank seals, exhaust is a new wes system so not blocked, dont think any electrics are getting wet as the only wire to the coil is covered in silicon sealant so is the plug cap, anyone got any ideas!!!!!