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195 Posts
I just purchased a 03 TRX 400ex from my girlfriend's brother's friend (I know, I know... that was my first mistake. ha ha).
I was told that the PO to him had an ATV performace shop in Mass buil the motor with a 416 Big Bore kit. Thing is, he doesn't know much about it and didn't bother asking questions, doesn't have the PO's number or email for me to ask him, and is not mechinically incline.
My question is how can I tell which Big Bore kit was installed as there is two out that I know if: a 10.8:1 and 12:1 compression kit? What should the compression be with each kit?
I was told that the PO to him had an ATV performace shop in Mass buil the motor with a 416 Big Bore kit. Thing is, he doesn't know much about it and didn't bother asking questions, doesn't have the PO's number or email for me to ask him, and is not mechinically incline.
My question is how can I tell which Big Bore kit was installed as there is two out that I know if: a 10.8:1 and 12:1 compression kit? What should the compression be with each kit?