YOU SAID:

this wont go to well strait for the horses mouth

INTO JAPANESE

これは馬の口のためによく海峡に行きません

BACK INTO ENGLISH

This does not often go to the strait because of the horse's mouth

INTO JAPANESE

これは馬の口のために海峡に行くことはあまりありません

BACK INTO ENGLISH

This rarely goes to the strait because of the horse's mouth

INTO JAPANESE

これは馬の口のために海峡に行くことはめったにありません

BACK INTO ENGLISH

This rarely goes to the strait because of the horse's mouth