Hello I'm new to this. last year I picked up a mini bike and I got it running "okay" I was told it was a broncco tx-1 the motor just keeps giving me issues I was wanting to put a 5 hp on it but I guess I have to get a jack shaft then? The motor that is on it now is mounted all the way over with the clutch backwards so the 5hp doesn't line up. If any one can help me with this that would be awesome, is this mini bike rare? Any information would be great thank you!