Saxat från manualen:
Remove spark plug and inspect for excess carbon build
up. Clean, re-gap to .6mm - .7mm if necessary. Check
plug after every 20 hours of operation. A suitable
replacement plug is NGK BP-6L if you can find it.
Otherwise, go for the NGK B-6L. The NGK R7-HS is also
recommended for better performance and smoother idling.
