yeah got new plug in and now cleaning out exhuast and putting new exhaust gasket in, still has me baffled though. Might try a hotter plug as it seems to get better as it gets warmer, also its a pig to start???
Bought a 1990 dt125r for my son to get about on, have deristricted it and fully opened the powervalve. Bike seems to missfire about 7k? anybody got any ideas why this is happening and how to fix it?
Many thanks