Hi all, I bought this bike (05 CR125) second hand about 1 month ago, the bike has been raced with the previous owner but I will be mainly trail riding. On my first ride day (2 hours trail riding) I fouled 4 plugs (2 x BR9ES, 2 x B8ES), I was using 30:1 mixture then but after that I started using 40:1. The second time I went trail riding with the bike I had a BR8ES in the bike which lasted about 3 hours until it fouled (came out very black and slightly oily). After this the next plug fouled in 10 minutes, then another in 10 minutes, then another straight away as I started the bike up. (Not sure how long since last top end) What could this be, clogged carby jets? needs top end? I really don't know. Even though I am trail riding I am riding it in power band regularly. Thanks, Josh P.S How do i clean fouled plugs and will the work like new?