2000 yamaha 350 Warrior - The exhaust studs keep breaking off in the head... Yesterday was the third time I have had to drill them out retapp and replace..... Not running it hard - this is even happening when just driving on pavement.
Yesterday I got frustrated and drilled out the stud holes...
As mention i will be porting my head, after looking at the specs of the head i have decided to only work to exhaust port, clean and lengthen the intake only this should increase my torque. will post pictures soon
any question p.m me