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jon and i were riding on the back roads pretty good speed an the 300 started making a grinding noise in the crank case before we got stopped she blewup motors is locked up big crack in bottom case plug gap pounded flat not sure what happened bu today we are installing a 98 300 motor i picked up from a friend when i get back to work we are going to look for a new upgraded motor or try to build one so i will need help frm all you guys on what specs to go to you all are so very helpfull so i guess it is R.I.P MONSTER the new motor smokes a little should i go ahead an put new rings in it :frown::redface: