I have a yamaha raptor 686 12:1 comp. with a ported head and all the goodies but my problem is that I am leaking antifreeze through the overflow in the back when I ride it hard. has any one had this problem if so how did you fix it. I think it is a head gasket but I have had this problem in the past also before I did the work to the engine. I have also replaced the the head gasket.

 

my fiend has a raptor also and that smae thing happend to him the first time he replaced the head gasket it fix it but te second time (like 2 weeks later) he Took a little of the radiater flood out and that did the trick like heres full line he took it down to about 3quaters full and he just keept a eye on the temp gague. OK well good luck with it.